mirror of
https://github.com/AsahiLinux/u-boot
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ce5207e191
As a part of the manufacturing process for some of our custom hardware,
we are programming the EEPROMs attached to our Intel 82571EB controllers
from software using U-Boot and Linux.
This code provides several conditionally-compiled features to assist in
our manufacturing process:
CONFIG_CMD_E1000:
This is a basic "e1000" command which allows querying the controller
and (if other config options are set) performing EEPROM programming.
In particular, with CONFIG_E1000_SPI this allows you to display a
hex-dump of the EEPROM, copy to/from main memory, and verify/update
the software checksum.
CONFIG_E1000_SPI_GENERIC:
Build a generic SPI driver providing the standard U-Boot SPI driver
interface. This allows commands such as "sspi" to access the bus
attached to the E1000 controller. Additionally, some E1000 chipsets
can support user data in a reserved space in the E1000 EEPROM which
could be used for U-Boot environment storage.
CONFIG_E1000_SPI:
The core SPI access code used by the above interfaces.
For example, the following commands allow you to program the EEPROM from
a USB device (assumes CONFIG_E1000_SPI and CONFIG_CMD_E1000 are enabled):
usb start
fatload usb 0 $loadaddr 82571EB_No_Mgmt_Discrete-LOM.bin
e1000 0 spi program $loadaddr 0 1024
e1000 0 spi checksum update
Please keep in mind that the Intel-provided .eep files are organized as
16-bit words. When converting them to binary form for programming you
must byteswap each 16-bit word so that it is in little-endian form.
This means that when reading and writing words to the SPI EEPROM, the
bit ordering for each word looks like this on the wire:
Time >>>
------------------------------------------------------------------
... [7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8], ...
------------------------------------------------------------------
(MSB is 15, LSB is 0).
Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Cc: Ben Warren <biggerbadderben@gmail.com>
4789 lines
163 KiB
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4789 lines
163 KiB
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#
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# (C) Copyright 2000 - 2011
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# See file CREDITS for list of people who contributed to this
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# project.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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#
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Summary:
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========
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This directory contains the source code for U-Boot, a boot loader for
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Embedded boards based on PowerPC, ARM, MIPS and several other
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processors, which can be installed in a boot ROM and used to
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initialize and test the hardware or to download and run application
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code.
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The development of U-Boot is closely related to Linux: some parts of
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the source code originate in the Linux source tree, we have some
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header files in common, and special provision has been made to
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support booting of Linux images.
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Some attention has been paid to make this software easily
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configurable and extendable. For instance, all monitor commands are
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implemented with the same call interface, so that it's very easy to
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add new commands. Also, instead of permanently adding rarely used
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code (for instance hardware test utilities) to the monitor, you can
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load and run it dynamically.
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Status:
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=======
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In general, all boards for which a configuration option exists in the
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Makefile have been tested to some extent and can be considered
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"working". In fact, many of them are used in production systems.
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In case of problems see the CHANGELOG and CREDITS files to find out
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who contributed the specific port. The MAINTAINERS file lists board
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maintainers.
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Where to get help:
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==================
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In case you have questions about, problems with or contributions for
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U-Boot you should send a message to the U-Boot mailing list at
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<u-boot@lists.denx.de>. There is also an archive of previous traffic
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on the mailing list - please search the archive before asking FAQ's.
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Please see http://lists.denx.de/pipermail/u-boot and
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http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
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Where to get source code:
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=========================
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The U-Boot source code is maintained in the git repository at
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git://www.denx.de/git/u-boot.git ; you can browse it online at
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http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
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The "snapshot" links on this page allow you to download tarballs of
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any version you might be interested in. Official releases are also
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available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
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directory.
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Pre-built (and tested) images are available from
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ftp://ftp.denx.de/pub/u-boot/images/
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Where we come from:
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===================
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- start from 8xxrom sources
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- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
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- clean up code
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- make it easier to add custom boards
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- make it possible to add other [PowerPC] CPUs
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- extend functions, especially:
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* Provide extended interface to Linux boot loader
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* S-Record download
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* network boot
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* PCMCIA / CompactFlash / ATA disk / SCSI ... boot
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- create ARMBoot project (http://sourceforge.net/projects/armboot)
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- add other CPU families (starting with ARM)
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- create U-Boot project (http://sourceforge.net/projects/u-boot)
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- current project page: see http://www.denx.de/wiki/U-Boot
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Names and Spelling:
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===================
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The "official" name of this project is "Das U-Boot". The spelling
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"U-Boot" shall be used in all written text (documentation, comments
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in source files etc.). Example:
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This is the README file for the U-Boot project.
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File names etc. shall be based on the string "u-boot". Examples:
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include/asm-ppc/u-boot.h
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#include <asm/u-boot.h>
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Variable names, preprocessor constants etc. shall be either based on
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the string "u_boot" or on "U_BOOT". Example:
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U_BOOT_VERSION u_boot_logo
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IH_OS_U_BOOT u_boot_hush_start
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Versioning:
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===========
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Starting with the release in October 2008, the names of the releases
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were changed from numerical release numbers without deeper meaning
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into a time stamp based numbering. Regular releases are identified by
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names consisting of the calendar year and month of the release date.
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Additional fields (if present) indicate release candidates or bug fix
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releases in "stable" maintenance trees.
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Examples:
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U-Boot v2009.11 - Release November 2009
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U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
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U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
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Directory Hierarchy:
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====================
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/arch Architecture specific files
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/arm Files generic to ARM architecture
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/cpu CPU specific files
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/arm720t Files specific to ARM 720 CPUs
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/arm920t Files specific to ARM 920 CPUs
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/at91 Files specific to Atmel AT91RM9200 CPU
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/imx Files specific to Freescale MC9328 i.MX CPUs
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/s3c24x0 Files specific to Samsung S3C24X0 CPUs
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/arm925t Files specific to ARM 925 CPUs
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/arm926ejs Files specific to ARM 926 CPUs
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/arm1136 Files specific to ARM 1136 CPUs
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/ixp Files specific to Intel XScale IXP CPUs
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/pxa Files specific to Intel XScale PXA CPUs
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/s3c44b0 Files specific to Samsung S3C44B0 CPUs
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/sa1100 Files specific to Intel StrongARM SA1100 CPUs
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/lib Architecture specific library files
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/avr32 Files generic to AVR32 architecture
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/cpu CPU specific files
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/lib Architecture specific library files
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/blackfin Files generic to Analog Devices Blackfin architecture
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/cpu CPU specific files
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/lib Architecture specific library files
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/x86 Files generic to x86 architecture
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/cpu CPU specific files
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/lib Architecture specific library files
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/m68k Files generic to m68k architecture
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/cpu CPU specific files
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/mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
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/mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
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/mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
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/mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
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/mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
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/lib Architecture specific library files
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/microblaze Files generic to microblaze architecture
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/cpu CPU specific files
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/lib Architecture specific library files
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/mips Files generic to MIPS architecture
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/cpu CPU specific files
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/mips32 Files specific to MIPS32 CPUs
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/xburst Files specific to Ingenic XBurst CPUs
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/lib Architecture specific library files
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/nds32 Files generic to NDS32 architecture
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/cpu CPU specific files
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/n1213 Files specific to Andes Technology N1213 CPUs
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/lib Architecture specific library files
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/nios2 Files generic to Altera NIOS2 architecture
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/cpu CPU specific files
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/lib Architecture specific library files
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/powerpc Files generic to PowerPC architecture
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/cpu CPU specific files
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/74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
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/mpc5xx Files specific to Freescale MPC5xx CPUs
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/mpc5xxx Files specific to Freescale MPC5xxx CPUs
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/mpc8xx Files specific to Freescale MPC8xx CPUs
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/mpc8220 Files specific to Freescale MPC8220 CPUs
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/mpc824x Files specific to Freescale MPC824x CPUs
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/mpc8260 Files specific to Freescale MPC8260 CPUs
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/mpc85xx Files specific to Freescale MPC85xx CPUs
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/ppc4xx Files specific to AMCC PowerPC 4xx CPUs
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/lib Architecture specific library files
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/sh Files generic to SH architecture
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/cpu CPU specific files
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/sh2 Files specific to sh2 CPUs
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/sh3 Files specific to sh3 CPUs
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/sh4 Files specific to sh4 CPUs
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/lib Architecture specific library files
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/sparc Files generic to SPARC architecture
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/cpu CPU specific files
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/leon2 Files specific to Gaisler LEON2 SPARC CPU
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/leon3 Files specific to Gaisler LEON3 SPARC CPU
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/lib Architecture specific library files
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/api Machine/arch independent API for external apps
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/board Board dependent files
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/common Misc architecture independent functions
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/disk Code for disk drive partition handling
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/doc Documentation (don't expect too much)
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/drivers Commonly used device drivers
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/examples Example code for standalone applications, etc.
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/fs Filesystem code (cramfs, ext2, jffs2, etc.)
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/include Header Files
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/lib Files generic to all architectures
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/libfdt Library files to support flattened device trees
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/lzma Library files to support LZMA decompression
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/lzo Library files to support LZO decompression
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/net Networking code
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/post Power On Self Test
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/rtc Real Time Clock drivers
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/tools Tools to build S-Record or U-Boot images, etc.
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Software Configuration:
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=======================
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Configuration is usually done using C preprocessor defines; the
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rationale behind that is to avoid dead code whenever possible.
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There are two classes of configuration variables:
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* Configuration _OPTIONS_:
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These are selectable by the user and have names beginning with
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"CONFIG_".
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* Configuration _SETTINGS_:
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These depend on the hardware etc. and should not be meddled with if
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you don't know what you're doing; they have names beginning with
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"CONFIG_SYS_".
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Later we will add a configuration tool - probably similar to or even
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identical to what's used for the Linux kernel. Right now, we have to
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do the configuration by hand, which means creating some symbolic
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links and editing some configuration files. We use the TQM8xxL boards
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as an example here.
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Selection of Processor Architecture and Board Type:
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---------------------------------------------------
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For all supported boards there are ready-to-use default
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configurations available; just type "make <board_name>_config".
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Example: For a TQM823L module type:
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cd u-boot
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make TQM823L_config
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For the Cogent platform, you need to specify the CPU type as well;
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e.g. "make cogent_mpc8xx_config". And also configure the cogent
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directory according to the instructions in cogent/README.
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Configuration Options:
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----------------------
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Configuration depends on the combination of board and CPU type; all
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such information is kept in a configuration file
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"include/configs/<board_name>.h".
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Example: For a TQM823L module, all configuration settings are in
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"include/configs/TQM823L.h".
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Many of the options are named exactly as the corresponding Linux
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kernel configuration options. The intention is to make it easier to
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build a config tool - later.
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The following options need to be configured:
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- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
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- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
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- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
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Define exactly one, e.g. CONFIG_ATSTK1002
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- CPU Module Type: (if CONFIG_COGENT is defined)
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Define exactly one of
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CONFIG_CMA286_60_OLD
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--- FIXME --- not tested yet:
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CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
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CONFIG_CMA287_23, CONFIG_CMA287_50
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- Motherboard Type: (if CONFIG_COGENT is defined)
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Define exactly one of
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CONFIG_CMA101, CONFIG_CMA102
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- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
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Define one or more of
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CONFIG_CMA302
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- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
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Define one or more of
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CONFIG_LCD_HEARTBEAT - update a character position on
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the LCD display every second with
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a "rotator" |\-/|\-/
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- Board flavour: (if CONFIG_MPC8260ADS is defined)
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CONFIG_ADSTYPE
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Possible values are:
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CONFIG_SYS_8260ADS - original MPC8260ADS
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CONFIG_SYS_8266ADS - MPC8266ADS
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CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
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CONFIG_SYS_8272ADS - MPC8272ADS
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- Marvell Family Member
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CONFIG_SYS_MVFS - define it if you want to enable
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multiple fs option at one time
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for marvell soc family
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- MPC824X Family Member (if CONFIG_MPC824X is defined)
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Define exactly one of
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CONFIG_MPC8240, CONFIG_MPC8245
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- 8xx CPU Options: (if using an MPC8xx CPU)
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CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
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get_gclk_freq() cannot work
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e.g. if there is no 32KHz
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reference PIT/RTC clock
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CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
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or XTAL/EXTAL)
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- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
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CONFIG_SYS_8xx_CPUCLK_MIN
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CONFIG_SYS_8xx_CPUCLK_MAX
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CONFIG_8xx_CPUCLK_DEFAULT
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See doc/README.MPC866
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CONFIG_SYS_MEASURE_CPUCLK
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Define this to measure the actual CPU clock instead
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of relying on the correctness of the configured
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values. Mostly useful for board bringup to make sure
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the PLL is locked at the intended frequency. Note
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that this requires a (stable) reference clock (32 kHz
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RTC clock or CONFIG_SYS_8XX_XIN)
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CONFIG_SYS_DELAYED_ICACHE
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Define this option if you want to enable the
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ICache only when Code runs from RAM.
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- 85xx CPU Options:
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CONFIG_SYS_FSL_TBCLK_DIV
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Defines the core time base clock divider ratio compared to the
|
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system clock. On most PQ3 devices this is 8, on newer QorIQ
|
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devices it can be 16 or 32. The ratio varies from SoC to Soc.
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CONFIG_SYS_FSL_PCIE_COMPAT
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Defines the string to utilize when trying to match PCIe device
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tree nodes for the given platform.
|
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- Intel Monahans options:
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CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
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Defines the Monahans run mode to oscillator
|
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ratio. Valid values are 8, 16, 24, 31. The core
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frequency is this value multiplied by 13 MHz.
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CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
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Defines the Monahans turbo mode to oscillator
|
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ratio. Valid values are 1 (default if undefined) and
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2. The core frequency as calculated above is multiplied
|
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by this value.
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- MIPS CPU options:
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CONFIG_SYS_INIT_SP_OFFSET
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Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
|
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pointer. This is needed for the temporary stack before
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relocation.
|
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CONFIG_SYS_MIPS_CACHE_MODE
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Cache operation mode for the MIPS CPU.
|
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See also arch/mips/include/asm/mipsregs.h.
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Possible values are:
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CONF_CM_CACHABLE_NO_WA
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CONF_CM_CACHABLE_WA
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CONF_CM_UNCACHED
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CONF_CM_CACHABLE_NONCOHERENT
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|
CONF_CM_CACHABLE_CE
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|
CONF_CM_CACHABLE_COW
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|
CONF_CM_CACHABLE_CUW
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CONF_CM_CACHABLE_ACCELERATED
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|
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CONFIG_SYS_XWAY_EBU_BOOTCFG
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Special option for Lantiq XWAY SoCs for booting from NOR flash.
|
|
See also arch/mips/cpu/mips32/start.S.
|
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CONFIG_XWAY_SWAP_BYTES
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Enable compilation of tools/xway-swap-bytes needed for Lantiq
|
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XWAY SoCs for booting from NOR flash. The U-Boot image needs to
|
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be swapped if a flash programmer is used.
|
|
|
|
- Linux Kernel Interface:
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CONFIG_CLOCKS_IN_MHZ
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U-Boot stores all clock information in Hz
|
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internally. For binary compatibility with older Linux
|
|
kernels (which expect the clocks passed in the
|
|
bd_info data to be in MHz) the environment variable
|
|
"clocks_in_mhz" can be defined so that U-Boot
|
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converts clock data to MHZ before passing it to the
|
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Linux kernel.
|
|
When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
|
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"clocks_in_mhz=1" is automatically included in the
|
|
default environment.
|
|
|
|
CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
|
|
|
|
When transferring memsize parameter to linux, some versions
|
|
expect it to be in bytes, others in MB.
|
|
Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
|
|
|
|
CONFIG_OF_LIBFDT
|
|
|
|
New kernel versions are expecting firmware settings to be
|
|
passed using flattened device trees (based on open firmware
|
|
concepts).
|
|
|
|
CONFIG_OF_LIBFDT
|
|
* New libfdt-based support
|
|
* Adds the "fdt" command
|
|
* The bootm command automatically updates the fdt
|
|
|
|
OF_CPU - The proper name of the cpus node (only required for
|
|
MPC512X and MPC5xxx based boards).
|
|
OF_SOC - The proper name of the soc node (only required for
|
|
MPC512X and MPC5xxx based boards).
|
|
OF_TBCLK - The timebase frequency.
|
|
OF_STDOUT_PATH - The path to the console device
|
|
|
|
boards with QUICC Engines require OF_QE to set UCC MAC
|
|
addresses
|
|
|
|
CONFIG_OF_BOARD_SETUP
|
|
|
|
Board code has addition modification that it wants to make
|
|
to the flat device tree before handing it off to the kernel
|
|
|
|
CONFIG_OF_BOOT_CPU
|
|
|
|
This define fills in the correct boot CPU in the boot
|
|
param header, the default value is zero if undefined.
|
|
|
|
CONFIG_OF_IDE_FIXUP
|
|
|
|
U-Boot can detect if an IDE device is present or not.
|
|
If not, and this new config option is activated, U-Boot
|
|
removes the ATA node from the DTS before booting Linux,
|
|
so the Linux IDE driver does not probe the device and
|
|
crash. This is needed for buggy hardware (uc101) where
|
|
no pull down resistor is connected to the signal IDE5V_DD7.
|
|
|
|
CONFIG_MACH_TYPE [relevant for ARM only][mandatory]
|
|
|
|
This setting is mandatory for all boards that have only one
|
|
machine type and must be used to specify the machine type
|
|
number as it appears in the ARM machine registry
|
|
(see http://www.arm.linux.org.uk/developer/machines/).
|
|
Only boards that have multiple machine types supported
|
|
in a single configuration file and the machine type is
|
|
runtime discoverable, do not have to use this setting.
|
|
|
|
- vxWorks boot parameters:
|
|
|
|
bootvx constructs a valid bootline using the following
|
|
environments variables: bootfile, ipaddr, serverip, hostname.
|
|
It loads the vxWorks image pointed bootfile.
|
|
|
|
CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
|
|
CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
|
|
CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
|
|
CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
|
|
|
|
CONFIG_SYS_VXWORKS_ADD_PARAMS
|
|
|
|
Add it at the end of the bootline. E.g "u=username pw=secret"
|
|
|
|
Note: If a "bootargs" environment is defined, it will overwride
|
|
the defaults discussed just above.
|
|
|
|
- Cache Configuration:
|
|
CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
|
|
CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
|
|
CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
|
|
|
|
- Cache Configuration for ARM:
|
|
CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
|
|
controller
|
|
CONFIG_SYS_PL310_BASE - Physical base address of PL310
|
|
controller register space
|
|
|
|
- Serial Ports:
|
|
CONFIG_PL010_SERIAL
|
|
|
|
Define this if you want support for Amba PrimeCell PL010 UARTs.
|
|
|
|
CONFIG_PL011_SERIAL
|
|
|
|
Define this if you want support for Amba PrimeCell PL011 UARTs.
|
|
|
|
CONFIG_PL011_CLOCK
|
|
|
|
If you have Amba PrimeCell PL011 UARTs, set this variable to
|
|
the clock speed of the UARTs.
|
|
|
|
CONFIG_PL01x_PORTS
|
|
|
|
If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
|
|
define this to a list of base addresses for each (supported)
|
|
port. See e.g. include/configs/versatile.h
|
|
|
|
CONFIG_PL011_SERIAL_RLCR
|
|
|
|
Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
|
|
have separate receive and transmit line control registers. Set
|
|
this variable to initialize the extra register.
|
|
|
|
CONFIG_PL011_SERIAL_FLUSH_ON_INIT
|
|
|
|
On some platforms (e.g. U8500) U-Boot is loaded by a second stage
|
|
boot loader that has already initialized the UART. Define this
|
|
variable to flush the UART at init time.
|
|
|
|
|
|
- Console Interface:
|
|
Depending on board, define exactly one serial port
|
|
(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
|
|
CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
|
|
console by defining CONFIG_8xx_CONS_NONE
|
|
|
|
Note: if CONFIG_8xx_CONS_NONE is defined, the serial
|
|
port routines must be defined elsewhere
|
|
(i.e. serial_init(), serial_getc(), ...)
|
|
|
|
CONFIG_CFB_CONSOLE
|
|
Enables console device for a color framebuffer. Needs following
|
|
defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
|
|
VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
|
|
(default big endian)
|
|
VIDEO_HW_RECTFILL graphic chip supports
|
|
rectangle fill
|
|
(cf. smiLynxEM)
|
|
VIDEO_HW_BITBLT graphic chip supports
|
|
bit-blit (cf. smiLynxEM)
|
|
VIDEO_VISIBLE_COLS visible pixel columns
|
|
(cols=pitch)
|
|
VIDEO_VISIBLE_ROWS visible pixel rows
|
|
VIDEO_PIXEL_SIZE bytes per pixel
|
|
VIDEO_DATA_FORMAT graphic data format
|
|
(0-5, cf. cfb_console.c)
|
|
VIDEO_FB_ADRS framebuffer address
|
|
VIDEO_KBD_INIT_FCT keyboard int fct
|
|
(i.e. i8042_kbd_init())
|
|
VIDEO_TSTC_FCT test char fct
|
|
(i.e. i8042_tstc)
|
|
VIDEO_GETC_FCT get char fct
|
|
(i.e. i8042_getc)
|
|
CONFIG_CONSOLE_CURSOR cursor drawing on/off
|
|
(requires blink timer
|
|
cf. i8042.c)
|
|
CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
|
|
CONFIG_CONSOLE_TIME display time/date info in
|
|
upper right corner
|
|
(requires CONFIG_CMD_DATE)
|
|
CONFIG_VIDEO_LOGO display Linux logo in
|
|
upper left corner
|
|
CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
|
|
linux_logo.h for logo.
|
|
Requires CONFIG_VIDEO_LOGO
|
|
CONFIG_CONSOLE_EXTRA_INFO
|
|
additional board info beside
|
|
the logo
|
|
|
|
When CONFIG_CFB_CONSOLE is defined, video console is
|
|
default i/o. Serial console can be forced with
|
|
environment 'console=serial'.
|
|
|
|
When CONFIG_SILENT_CONSOLE is defined, all console
|
|
messages (by U-Boot and Linux!) can be silenced with
|
|
the "silent" environment variable. See
|
|
doc/README.silent for more information.
|
|
|
|
- Console Baudrate:
|
|
CONFIG_BAUDRATE - in bps
|
|
Select one of the baudrates listed in
|
|
CONFIG_SYS_BAUDRATE_TABLE, see below.
|
|
CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
|
|
|
|
- Console Rx buffer length
|
|
With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
|
|
the maximum receive buffer length for the SMC.
|
|
This option is actual only for 82xx and 8xx possible.
|
|
If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
|
|
must be defined, to setup the maximum idle timeout for
|
|
the SMC.
|
|
|
|
- Pre-Console Buffer:
|
|
Prior to the console being initialised (i.e. serial UART
|
|
initialised etc) all console output is silently discarded.
|
|
Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
|
|
buffer any console messages prior to the console being
|
|
initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
|
|
bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
|
|
a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
|
|
bytes are output before the console is initialised, the
|
|
earlier bytes are discarded.
|
|
|
|
'Sane' compilers will generate smaller code if
|
|
CONFIG_PRE_CON_BUF_SZ is a power of 2
|
|
|
|
- Boot Delay: CONFIG_BOOTDELAY - in seconds
|
|
Delay before automatically booting the default image;
|
|
set to -1 to disable autoboot.
|
|
|
|
See doc/README.autoboot for these options that
|
|
work with CONFIG_BOOTDELAY. None are required.
|
|
CONFIG_BOOT_RETRY_TIME
|
|
CONFIG_BOOT_RETRY_MIN
|
|
CONFIG_AUTOBOOT_KEYED
|
|
CONFIG_AUTOBOOT_PROMPT
|
|
CONFIG_AUTOBOOT_DELAY_STR
|
|
CONFIG_AUTOBOOT_STOP_STR
|
|
CONFIG_AUTOBOOT_DELAY_STR2
|
|
CONFIG_AUTOBOOT_STOP_STR2
|
|
CONFIG_ZERO_BOOTDELAY_CHECK
|
|
CONFIG_RESET_TO_RETRY
|
|
|
|
- Autoboot Command:
|
|
CONFIG_BOOTCOMMAND
|
|
Only needed when CONFIG_BOOTDELAY is enabled;
|
|
define a command string that is automatically executed
|
|
when no character is read on the console interface
|
|
within "Boot Delay" after reset.
|
|
|
|
CONFIG_BOOTARGS
|
|
This can be used to pass arguments to the bootm
|
|
command. The value of CONFIG_BOOTARGS goes into the
|
|
environment value "bootargs".
|
|
|
|
CONFIG_RAMBOOT and CONFIG_NFSBOOT
|
|
The value of these goes into the environment as
|
|
"ramboot" and "nfsboot" respectively, and can be used
|
|
as a convenience, when switching between booting from
|
|
RAM and NFS.
|
|
|
|
- Pre-Boot Commands:
|
|
CONFIG_PREBOOT
|
|
|
|
When this option is #defined, the existence of the
|
|
environment variable "preboot" will be checked
|
|
immediately before starting the CONFIG_BOOTDELAY
|
|
countdown and/or running the auto-boot command resp.
|
|
entering interactive mode.
|
|
|
|
This feature is especially useful when "preboot" is
|
|
automatically generated or modified. For an example
|
|
see the LWMON board specific code: here "preboot" is
|
|
modified when the user holds down a certain
|
|
combination of keys on the (special) keyboard when
|
|
booting the systems
|
|
|
|
- Serial Download Echo Mode:
|
|
CONFIG_LOADS_ECHO
|
|
If defined to 1, all characters received during a
|
|
serial download (using the "loads" command) are
|
|
echoed back. This might be needed by some terminal
|
|
emulations (like "cu"), but may as well just take
|
|
time on others. This setting #define's the initial
|
|
value of the "loads_echo" environment variable.
|
|
|
|
- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
|
|
CONFIG_KGDB_BAUDRATE
|
|
Select one of the baudrates listed in
|
|
CONFIG_SYS_BAUDRATE_TABLE, see below.
|
|
|
|
- Monitor Functions:
|
|
Monitor commands can be included or excluded
|
|
from the build by using the #include files
|
|
"config_cmd_all.h" and #undef'ing unwanted
|
|
commands, or using "config_cmd_default.h"
|
|
and augmenting with additional #define's
|
|
for wanted commands.
|
|
|
|
The default command configuration includes all commands
|
|
except those marked below with a "*".
|
|
|
|
CONFIG_CMD_ASKENV * ask for env variable
|
|
CONFIG_CMD_BDI bdinfo
|
|
CONFIG_CMD_BEDBUG * Include BedBug Debugger
|
|
CONFIG_CMD_BMP * BMP support
|
|
CONFIG_CMD_BSP * Board specific commands
|
|
CONFIG_CMD_BOOTD bootd
|
|
CONFIG_CMD_CACHE * icache, dcache
|
|
CONFIG_CMD_CONSOLE coninfo
|
|
CONFIG_CMD_CRC32 * crc32
|
|
CONFIG_CMD_DATE * support for RTC, date/time...
|
|
CONFIG_CMD_DHCP * DHCP support
|
|
CONFIG_CMD_DIAG * Diagnostics
|
|
CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
|
|
CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
|
|
CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
|
|
CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
|
|
CONFIG_CMD_DTT * Digital Therm and Thermostat
|
|
CONFIG_CMD_ECHO echo arguments
|
|
CONFIG_CMD_EDITENV edit env variable
|
|
CONFIG_CMD_EEPROM * EEPROM read/write support
|
|
CONFIG_CMD_ELF * bootelf, bootvx
|
|
CONFIG_CMD_EXPORTENV * export the environment
|
|
CONFIG_CMD_SAVEENV saveenv
|
|
CONFIG_CMD_FDC * Floppy Disk Support
|
|
CONFIG_CMD_FAT * FAT partition support
|
|
CONFIG_CMD_FDOS * Dos diskette Support
|
|
CONFIG_CMD_FLASH flinfo, erase, protect
|
|
CONFIG_CMD_FPGA FPGA device initialization support
|
|
CONFIG_CMD_GO * the 'go' command (exec code)
|
|
CONFIG_CMD_GREPENV * search environment
|
|
CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
|
|
CONFIG_CMD_I2C * I2C serial bus support
|
|
CONFIG_CMD_IDE * IDE harddisk support
|
|
CONFIG_CMD_IMI iminfo
|
|
CONFIG_CMD_IMLS List all found images
|
|
CONFIG_CMD_IMMAP * IMMR dump support
|
|
CONFIG_CMD_IMPORTENV * import an environment
|
|
CONFIG_CMD_IRQ * irqinfo
|
|
CONFIG_CMD_ITEST Integer/string test of 2 values
|
|
CONFIG_CMD_JFFS2 * JFFS2 Support
|
|
CONFIG_CMD_KGDB * kgdb
|
|
CONFIG_CMD_LDRINFO ldrinfo (display Blackfin loader)
|
|
CONFIG_CMD_LOADB loadb
|
|
CONFIG_CMD_LOADS loads
|
|
CONFIG_CMD_MD5SUM print md5 message digest
|
|
(requires CONFIG_CMD_MEMORY and CONFIG_MD5)
|
|
CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
|
|
loop, loopw, mtest
|
|
CONFIG_CMD_MISC Misc functions like sleep etc
|
|
CONFIG_CMD_MMC * MMC memory mapped support
|
|
CONFIG_CMD_MII * MII utility commands
|
|
CONFIG_CMD_MTDPARTS * MTD partition support
|
|
CONFIG_CMD_NAND * NAND support
|
|
CONFIG_CMD_NET bootp, tftpboot, rarpboot
|
|
CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
|
|
CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
|
|
CONFIG_CMD_PCI * pciinfo
|
|
CONFIG_CMD_PCMCIA * PCMCIA support
|
|
CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
|
|
host
|
|
CONFIG_CMD_PORTIO * Port I/O
|
|
CONFIG_CMD_REGINFO * Register dump
|
|
CONFIG_CMD_RUN run command in env variable
|
|
CONFIG_CMD_SAVES * save S record dump
|
|
CONFIG_CMD_SCSI * SCSI Support
|
|
CONFIG_CMD_SDRAM * print SDRAM configuration information
|
|
(requires CONFIG_CMD_I2C)
|
|
CONFIG_CMD_SETGETDCR Support for DCR Register access
|
|
(4xx only)
|
|
CONFIG_CMD_SHA1SUM print sha1 memory digest
|
|
(requires CONFIG_CMD_MEMORY)
|
|
CONFIG_CMD_SOURCE "source" command Support
|
|
CONFIG_CMD_SPI * SPI serial bus support
|
|
CONFIG_CMD_TFTPSRV * TFTP transfer in server mode
|
|
CONFIG_CMD_TFTPPUT * TFTP put command (upload)
|
|
CONFIG_CMD_TIME * run command and report execution time
|
|
CONFIG_CMD_USB * USB support
|
|
CONFIG_CMD_CDP * Cisco Discover Protocol support
|
|
CONFIG_CMD_FSL * Microblaze FSL support
|
|
|
|
|
|
EXAMPLE: If you want all functions except of network
|
|
support you can write:
|
|
|
|
#include "config_cmd_all.h"
|
|
#undef CONFIG_CMD_NET
|
|
|
|
Other Commands:
|
|
fdt (flattened device tree) command: CONFIG_OF_LIBFDT
|
|
|
|
Note: Don't enable the "icache" and "dcache" commands
|
|
(configuration option CONFIG_CMD_CACHE) unless you know
|
|
what you (and your U-Boot users) are doing. Data
|
|
cache cannot be enabled on systems like the 8xx or
|
|
8260 (where accesses to the IMMR region must be
|
|
uncached), and it cannot be disabled on all other
|
|
systems where we (mis-) use the data cache to hold an
|
|
initial stack and some data.
|
|
|
|
|
|
XXX - this list needs to get updated!
|
|
|
|
- Device tree:
|
|
CONFIG_OF_CONTROL
|
|
If this variable is defined, U-Boot will use a device tree
|
|
to configure its devices, instead of relying on statically
|
|
compiled #defines in the board file. This option is
|
|
experimental and only available on a few boards. The device
|
|
tree is available in the global data as gd->fdt_blob.
|
|
|
|
U-Boot needs to get its device tree from somewhere. This can
|
|
be done using one of the two options below:
|
|
|
|
CONFIG_OF_EMBED
|
|
If this variable is defined, U-Boot will embed a device tree
|
|
binary in its image. This device tree file should be in the
|
|
board directory and called <soc>-<board>.dts. The binary file
|
|
is then picked up in board_init_f() and made available through
|
|
the global data structure as gd->blob.
|
|
|
|
CONFIG_OF_SEPARATE
|
|
If this variable is defined, U-Boot will build a device tree
|
|
binary. It will be called u-boot.dtb. Architecture-specific
|
|
code will locate it at run-time. Generally this works by:
|
|
|
|
cat u-boot.bin u-boot.dtb >image.bin
|
|
|
|
and in fact, U-Boot does this for you, creating a file called
|
|
u-boot-dtb.bin which is useful in the common case. You can
|
|
still use the individual files if you need something more
|
|
exotic.
|
|
|
|
- Watchdog:
|
|
CONFIG_WATCHDOG
|
|
If this variable is defined, it enables watchdog
|
|
support for the SoC. There must be support in the SoC
|
|
specific code for a watchdog. For the 8xx and 8260
|
|
CPUs, the SIU Watchdog feature is enabled in the SYPCR
|
|
register. When supported for a specific SoC is
|
|
available, then no further board specific code should
|
|
be needed to use it.
|
|
|
|
CONFIG_HW_WATCHDOG
|
|
When using a watchdog circuitry external to the used
|
|
SoC, then define this variable and provide board
|
|
specific code for the "hw_watchdog_reset" function.
|
|
|
|
- U-Boot Version:
|
|
CONFIG_VERSION_VARIABLE
|
|
If this variable is defined, an environment variable
|
|
named "ver" is created by U-Boot showing the U-Boot
|
|
version as printed by the "version" command.
|
|
This variable is readonly.
|
|
|
|
- Real-Time Clock:
|
|
|
|
When CONFIG_CMD_DATE is selected, the type of the RTC
|
|
has to be selected, too. Define exactly one of the
|
|
following options:
|
|
|
|
CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
|
|
CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
|
|
CONFIG_RTC_MC13783 - use MC13783 RTC
|
|
CONFIG_RTC_MC146818 - use MC146818 RTC
|
|
CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
|
|
CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
|
|
CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
|
|
CONFIG_RTC_DS164x - use Dallas DS164x RTC
|
|
CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
|
|
CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
|
|
CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
|
|
CONFIG_SYS_RV3029_TCR - enable trickle charger on
|
|
RV3029 RTC.
|
|
|
|
Note that if the RTC uses I2C, then the I2C interface
|
|
must also be configured. See I2C Support, below.
|
|
|
|
- GPIO Support:
|
|
CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
|
|
CONFIG_PCA953X_INFO - enable pca953x info command
|
|
|
|
The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
|
|
chip-ngpio pairs that tell the PCA953X driver the number of
|
|
pins supported by a particular chip.
|
|
|
|
Note that if the GPIO device uses I2C, then the I2C interface
|
|
must also be configured. See I2C Support, below.
|
|
|
|
- Timestamp Support:
|
|
|
|
When CONFIG_TIMESTAMP is selected, the timestamp
|
|
(date and time) of an image is printed by image
|
|
commands like bootm or iminfo. This option is
|
|
automatically enabled when you select CONFIG_CMD_DATE .
|
|
|
|
- Partition Support:
|
|
CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
|
|
and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
|
|
|
|
If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
|
|
CONFIG_CMD_SCSI) you must configure support for at
|
|
least one partition type as well.
|
|
|
|
- IDE Reset method:
|
|
CONFIG_IDE_RESET_ROUTINE - this is defined in several
|
|
board configurations files but used nowhere!
|
|
|
|
CONFIG_IDE_RESET - is this is defined, IDE Reset will
|
|
be performed by calling the function
|
|
ide_set_reset(int reset)
|
|
which has to be defined in a board specific file
|
|
|
|
- ATAPI Support:
|
|
CONFIG_ATAPI
|
|
|
|
Set this to enable ATAPI support.
|
|
|
|
- LBA48 Support
|
|
CONFIG_LBA48
|
|
|
|
Set this to enable support for disks larger than 137GB
|
|
Also look at CONFIG_SYS_64BIT_LBA.
|
|
Whithout these , LBA48 support uses 32bit variables and will 'only'
|
|
support disks up to 2.1TB.
|
|
|
|
CONFIG_SYS_64BIT_LBA:
|
|
When enabled, makes the IDE subsystem use 64bit sector addresses.
|
|
Default is 32bit.
|
|
|
|
- SCSI Support:
|
|
At the moment only there is only support for the
|
|
SYM53C8XX SCSI controller; define
|
|
CONFIG_SCSI_SYM53C8XX to enable it.
|
|
|
|
CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
|
|
CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
|
|
CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
|
|
maximum numbers of LUNs, SCSI ID's and target
|
|
devices.
|
|
CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
|
|
|
|
- NETWORK Support (PCI):
|
|
CONFIG_E1000
|
|
Support for Intel 8254x/8257x gigabit chips.
|
|
|
|
CONFIG_E1000_SPI
|
|
Utility code for direct access to the SPI bus on Intel 8257x.
|
|
This does not do anything useful unless you set at least one
|
|
of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
|
|
|
|
CONFIG_E1000_SPI_GENERIC
|
|
Allow generic access to the SPI bus on the Intel 8257x, for
|
|
example with the "sspi" command.
|
|
|
|
CONFIG_CMD_E1000
|
|
Management command for E1000 devices. When used on devices
|
|
with SPI support you can reprogram the EEPROM from U-Boot.
|
|
|
|
CONFIG_E1000_FALLBACK_MAC
|
|
default MAC for empty EEPROM after production.
|
|
|
|
CONFIG_EEPRO100
|
|
Support for Intel 82557/82559/82559ER chips.
|
|
Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
|
|
write routine for first time initialisation.
|
|
|
|
CONFIG_TULIP
|
|
Support for Digital 2114x chips.
|
|
Optional CONFIG_TULIP_SELECT_MEDIA for board specific
|
|
modem chip initialisation (KS8761/QS6611).
|
|
|
|
CONFIG_NATSEMI
|
|
Support for National dp83815 chips.
|
|
|
|
CONFIG_NS8382X
|
|
Support for National dp8382[01] gigabit chips.
|
|
|
|
- NETWORK Support (other):
|
|
|
|
CONFIG_DRIVER_AT91EMAC
|
|
Support for AT91RM9200 EMAC.
|
|
|
|
CONFIG_RMII
|
|
Define this to use reduced MII inteface
|
|
|
|
CONFIG_DRIVER_AT91EMAC_QUIET
|
|
If this defined, the driver is quiet.
|
|
The driver doen't show link status messages.
|
|
|
|
CONFIG_DRIVER_LAN91C96
|
|
Support for SMSC's LAN91C96 chips.
|
|
|
|
CONFIG_LAN91C96_BASE
|
|
Define this to hold the physical address
|
|
of the LAN91C96's I/O space
|
|
|
|
CONFIG_LAN91C96_USE_32_BIT
|
|
Define this to enable 32 bit addressing
|
|
|
|
CONFIG_DRIVER_SMC91111
|
|
Support for SMSC's LAN91C111 chip
|
|
|
|
CONFIG_SMC91111_BASE
|
|
Define this to hold the physical address
|
|
of the device (I/O space)
|
|
|
|
CONFIG_SMC_USE_32_BIT
|
|
Define this if data bus is 32 bits
|
|
|
|
CONFIG_SMC_USE_IOFUNCS
|
|
Define this to use i/o functions instead of macros
|
|
(some hardware wont work with macros)
|
|
|
|
CONFIG_FTGMAC100
|
|
Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
|
|
|
|
CONFIG_FTGMAC100_EGIGA
|
|
Define this to use GE link update with gigabit PHY.
|
|
Define this if FTGMAC100 is connected to gigabit PHY.
|
|
If your system has 10/100 PHY only, it might not occur
|
|
wrong behavior. Because PHY usually return timeout or
|
|
useless data when polling gigabit status and gigabit
|
|
control registers. This behavior won't affect the
|
|
correctnessof 10/100 link speed update.
|
|
|
|
CONFIG_SMC911X
|
|
Support for SMSC's LAN911x and LAN921x chips
|
|
|
|
CONFIG_SMC911X_BASE
|
|
Define this to hold the physical address
|
|
of the device (I/O space)
|
|
|
|
CONFIG_SMC911X_32_BIT
|
|
Define this if data bus is 32 bits
|
|
|
|
CONFIG_SMC911X_16_BIT
|
|
Define this if data bus is 16 bits. If your processor
|
|
automatically converts one 32 bit word to two 16 bit
|
|
words you may also try CONFIG_SMC911X_32_BIT.
|
|
|
|
CONFIG_SH_ETHER
|
|
Support for Renesas on-chip Ethernet controller
|
|
|
|
CONFIG_SH_ETHER_USE_PORT
|
|
Define the number of ports to be used
|
|
|
|
CONFIG_SH_ETHER_PHY_ADDR
|
|
Define the ETH PHY's address
|
|
|
|
CONFIG_SH_ETHER_CACHE_WRITEBACK
|
|
If this option is set, the driver enables cache flush.
|
|
|
|
- USB Support:
|
|
At the moment only the UHCI host controller is
|
|
supported (PIP405, MIP405, MPC5200); define
|
|
CONFIG_USB_UHCI to enable it.
|
|
define CONFIG_USB_KEYBOARD to enable the USB Keyboard
|
|
and define CONFIG_USB_STORAGE to enable the USB
|
|
storage devices.
|
|
Note:
|
|
Supported are USB Keyboards and USB Floppy drives
|
|
(TEAC FD-05PUB).
|
|
MPC5200 USB requires additional defines:
|
|
CONFIG_USB_CLOCK
|
|
for 528 MHz Clock: 0x0001bbbb
|
|
CONFIG_PSC3_USB
|
|
for USB on PSC3
|
|
CONFIG_USB_CONFIG
|
|
for differential drivers: 0x00001000
|
|
for single ended drivers: 0x00005000
|
|
for differential drivers on PSC3: 0x00000100
|
|
for single ended drivers on PSC3: 0x00004100
|
|
CONFIG_SYS_USB_EVENT_POLL
|
|
May be defined to allow interrupt polling
|
|
instead of using asynchronous interrupts
|
|
|
|
- USB Device:
|
|
Define the below if you wish to use the USB console.
|
|
Once firmware is rebuilt from a serial console issue the
|
|
command "setenv stdin usbtty; setenv stdout usbtty" and
|
|
attach your USB cable. The Unix command "dmesg" should print
|
|
it has found a new device. The environment variable usbtty
|
|
can be set to gserial or cdc_acm to enable your device to
|
|
appear to a USB host as a Linux gserial device or a
|
|
Common Device Class Abstract Control Model serial device.
|
|
If you select usbtty = gserial you should be able to enumerate
|
|
a Linux host by
|
|
# modprobe usbserial vendor=0xVendorID product=0xProductID
|
|
else if using cdc_acm, simply setting the environment
|
|
variable usbtty to be cdc_acm should suffice. The following
|
|
might be defined in YourBoardName.h
|
|
|
|
CONFIG_USB_DEVICE
|
|
Define this to build a UDC device
|
|
|
|
CONFIG_USB_TTY
|
|
Define this to have a tty type of device available to
|
|
talk to the UDC device
|
|
|
|
CONFIG_SYS_CONSOLE_IS_IN_ENV
|
|
Define this if you want stdin, stdout &/or stderr to
|
|
be set to usbtty.
|
|
|
|
mpc8xx:
|
|
CONFIG_SYS_USB_EXTC_CLK 0xBLAH
|
|
Derive USB clock from external clock "blah"
|
|
- CONFIG_SYS_USB_EXTC_CLK 0x02
|
|
|
|
CONFIG_SYS_USB_BRG_CLK 0xBLAH
|
|
Derive USB clock from brgclk
|
|
- CONFIG_SYS_USB_BRG_CLK 0x04
|
|
|
|
If you have a USB-IF assigned VendorID then you may wish to
|
|
define your own vendor specific values either in BoardName.h
|
|
or directly in usbd_vendor_info.h. If you don't define
|
|
CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
|
|
CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
|
|
should pretend to be a Linux device to it's target host.
|
|
|
|
CONFIG_USBD_MANUFACTURER
|
|
Define this string as the name of your company for
|
|
- CONFIG_USBD_MANUFACTURER "my company"
|
|
|
|
CONFIG_USBD_PRODUCT_NAME
|
|
Define this string as the name of your product
|
|
- CONFIG_USBD_PRODUCT_NAME "acme usb device"
|
|
|
|
CONFIG_USBD_VENDORID
|
|
Define this as your assigned Vendor ID from the USB
|
|
Implementors Forum. This *must* be a genuine Vendor ID
|
|
to avoid polluting the USB namespace.
|
|
- CONFIG_USBD_VENDORID 0xFFFF
|
|
|
|
CONFIG_USBD_PRODUCTID
|
|
Define this as the unique Product ID
|
|
for your device
|
|
- CONFIG_USBD_PRODUCTID 0xFFFF
|
|
|
|
|
|
- MMC Support:
|
|
The MMC controller on the Intel PXA is supported. To
|
|
enable this define CONFIG_MMC. The MMC can be
|
|
accessed from the boot prompt by mapping the device
|
|
to physical memory similar to flash. Command line is
|
|
enabled with CONFIG_CMD_MMC. The MMC driver also works with
|
|
the FAT fs. This is enabled with CONFIG_CMD_FAT.
|
|
|
|
CONFIG_SH_MMCIF
|
|
Support for Renesas on-chip MMCIF controller
|
|
|
|
CONFIG_SH_MMCIF_ADDR
|
|
Define the base address of MMCIF registers
|
|
|
|
CONFIG_SH_MMCIF_CLK
|
|
Define the clock frequency for MMCIF
|
|
|
|
- Journaling Flash filesystem support:
|
|
CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
|
|
CONFIG_JFFS2_NAND_DEV
|
|
Define these for a default partition on a NAND device
|
|
|
|
CONFIG_SYS_JFFS2_FIRST_SECTOR,
|
|
CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
|
|
Define these for a default partition on a NOR device
|
|
|
|
CONFIG_SYS_JFFS_CUSTOM_PART
|
|
Define this to create an own partition. You have to provide a
|
|
function struct part_info* jffs2_part_info(int part_num)
|
|
|
|
If you define only one JFFS2 partition you may also want to
|
|
#define CONFIG_SYS_JFFS_SINGLE_PART 1
|
|
to disable the command chpart. This is the default when you
|
|
have not defined a custom partition
|
|
|
|
- FAT(File Allocation Table) filesystem write function support:
|
|
CONFIG_FAT_WRITE
|
|
Support for saving memory data as a file
|
|
in FAT formatted partition
|
|
|
|
- Keyboard Support:
|
|
CONFIG_ISA_KEYBOARD
|
|
|
|
Define this to enable standard (PC-Style) keyboard
|
|
support
|
|
|
|
CONFIG_I8042_KBD
|
|
Standard PC keyboard driver with US (is default) and
|
|
GERMAN key layout (switch via environment 'keymap=de') support.
|
|
Export function i8042_kbd_init, i8042_tstc and i8042_getc
|
|
for cfb_console. Supports cursor blinking.
|
|
|
|
- Video support:
|
|
CONFIG_VIDEO
|
|
|
|
Define this to enable video support (for output to
|
|
video).
|
|
|
|
CONFIG_VIDEO_CT69000
|
|
|
|
Enable Chips & Technologies 69000 Video chip
|
|
|
|
CONFIG_VIDEO_SMI_LYNXEM
|
|
Enable Silicon Motion SMI 712/710/810 Video chip. The
|
|
video output is selected via environment 'videoout'
|
|
(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
|
|
assumed.
|
|
|
|
For the CT69000 and SMI_LYNXEM drivers, videomode is
|
|
selected via environment 'videomode'. Two different ways
|
|
are possible:
|
|
- "videomode=num" 'num' is a standard LiLo mode numbers.
|
|
Following standard modes are supported (* is default):
|
|
|
|
Colors 640x480 800x600 1024x768 1152x864 1280x1024
|
|
-------------+---------------------------------------------
|
|
8 bits | 0x301* 0x303 0x305 0x161 0x307
|
|
15 bits | 0x310 0x313 0x316 0x162 0x319
|
|
16 bits | 0x311 0x314 0x317 0x163 0x31A
|
|
24 bits | 0x312 0x315 0x318 ? 0x31B
|
|
-------------+---------------------------------------------
|
|
(i.e. setenv videomode 317; saveenv; reset;)
|
|
|
|
- "videomode=bootargs" all the video parameters are parsed
|
|
from the bootargs. (See drivers/video/videomodes.c)
|
|
|
|
|
|
CONFIG_VIDEO_SED13806
|
|
Enable Epson SED13806 driver. This driver supports 8bpp
|
|
and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
|
|
or CONFIG_VIDEO_SED13806_16BPP
|
|
|
|
CONFIG_FSL_DIU_FB
|
|
Enable the Freescale DIU video driver. Reference boards for
|
|
SOCs that have a DIU should define this macro to enable DIU
|
|
support, and should also define these other macros:
|
|
|
|
CONFIG_SYS_DIU_ADDR
|
|
CONFIG_VIDEO
|
|
CONFIG_CMD_BMP
|
|
CONFIG_CFB_CONSOLE
|
|
CONFIG_VIDEO_SW_CURSOR
|
|
CONFIG_VGA_AS_SINGLE_DEVICE
|
|
CONFIG_VIDEO_LOGO
|
|
CONFIG_VIDEO_BMP_LOGO
|
|
|
|
The DIU driver will look for the 'video-mode' environment
|
|
variable, and if defined, enable the DIU as a console during
|
|
boot. See the documentation file README.video for a
|
|
description of this variable.
|
|
|
|
- Keyboard Support:
|
|
CONFIG_KEYBOARD
|
|
|
|
Define this to enable a custom keyboard support.
|
|
This simply calls drv_keyboard_init() which must be
|
|
defined in your board-specific files.
|
|
The only board using this so far is RBC823.
|
|
|
|
- LCD Support: CONFIG_LCD
|
|
|
|
Define this to enable LCD support (for output to LCD
|
|
display); also select one of the supported displays
|
|
by defining one of these:
|
|
|
|
CONFIG_ATMEL_LCD:
|
|
|
|
HITACHI TX09D70VM1CCA, 3.5", 240x320.
|
|
|
|
CONFIG_NEC_NL6448AC33:
|
|
|
|
NEC NL6448AC33-18. Active, color, single scan.
|
|
|
|
CONFIG_NEC_NL6448BC20
|
|
|
|
NEC NL6448BC20-08. 6.5", 640x480.
|
|
Active, color, single scan.
|
|
|
|
CONFIG_NEC_NL6448BC33_54
|
|
|
|
NEC NL6448BC33-54. 10.4", 640x480.
|
|
Active, color, single scan.
|
|
|
|
CONFIG_SHARP_16x9
|
|
|
|
Sharp 320x240. Active, color, single scan.
|
|
It isn't 16x9, and I am not sure what it is.
|
|
|
|
CONFIG_SHARP_LQ64D341
|
|
|
|
Sharp LQ64D341 display, 640x480.
|
|
Active, color, single scan.
|
|
|
|
CONFIG_HLD1045
|
|
|
|
HLD1045 display, 640x480.
|
|
Active, color, single scan.
|
|
|
|
CONFIG_OPTREX_BW
|
|
|
|
Optrex CBL50840-2 NF-FW 99 22 M5
|
|
or
|
|
Hitachi LMG6912RPFC-00T
|
|
or
|
|
Hitachi SP14Q002
|
|
|
|
320x240. Black & white.
|
|
|
|
Normally display is black on white background; define
|
|
CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
|
|
|
|
- Splash Screen Support: CONFIG_SPLASH_SCREEN
|
|
|
|
If this option is set, the environment is checked for
|
|
a variable "splashimage". If found, the usual display
|
|
of logo, copyright and system information on the LCD
|
|
is suppressed and the BMP image at the address
|
|
specified in "splashimage" is loaded instead. The
|
|
console is redirected to the "nulldev", too. This
|
|
allows for a "silent" boot where a splash screen is
|
|
loaded very quickly after power-on.
|
|
|
|
CONFIG_SPLASH_SCREEN_ALIGN
|
|
|
|
If this option is set the splash image can be freely positioned
|
|
on the screen. Environment variable "splashpos" specifies the
|
|
position as "x,y". If a positive number is given it is used as
|
|
number of pixel from left/top. If a negative number is given it
|
|
is used as number of pixel from right/bottom. You can also
|
|
specify 'm' for centering the image.
|
|
|
|
Example:
|
|
setenv splashpos m,m
|
|
=> image at center of screen
|
|
|
|
setenv splashpos 30,20
|
|
=> image at x = 30 and y = 20
|
|
|
|
setenv splashpos -10,m
|
|
=> vertically centered image
|
|
at x = dspWidth - bmpWidth - 9
|
|
|
|
- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
|
|
|
|
If this option is set, additionally to standard BMP
|
|
images, gzipped BMP images can be displayed via the
|
|
splashscreen support or the bmp command.
|
|
|
|
- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
|
|
|
|
If this option is set, 8-bit RLE compressed BMP images
|
|
can be displayed via the splashscreen support or the
|
|
bmp command.
|
|
|
|
- Compression support:
|
|
CONFIG_BZIP2
|
|
|
|
If this option is set, support for bzip2 compressed
|
|
images is included. If not, only uncompressed and gzip
|
|
compressed images are supported.
|
|
|
|
NOTE: the bzip2 algorithm requires a lot of RAM, so
|
|
the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
|
|
be at least 4MB.
|
|
|
|
CONFIG_LZMA
|
|
|
|
If this option is set, support for lzma compressed
|
|
images is included.
|
|
|
|
Note: The LZMA algorithm adds between 2 and 4KB of code and it
|
|
requires an amount of dynamic memory that is given by the
|
|
formula:
|
|
|
|
(1846 + 768 << (lc + lp)) * sizeof(uint16)
|
|
|
|
Where lc and lp stand for, respectively, Literal context bits
|
|
and Literal pos bits.
|
|
|
|
This value is upper-bounded by 14MB in the worst case. Anyway,
|
|
for a ~4MB large kernel image, we have lc=3 and lp=0 for a
|
|
total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
|
|
a very small buffer.
|
|
|
|
Use the lzmainfo tool to determinate the lc and lp values and
|
|
then calculate the amount of needed dynamic memory (ensuring
|
|
the appropriate CONFIG_SYS_MALLOC_LEN value).
|
|
|
|
- MII/PHY support:
|
|
CONFIG_PHY_ADDR
|
|
|
|
The address of PHY on MII bus.
|
|
|
|
CONFIG_PHY_CLOCK_FREQ (ppc4xx)
|
|
|
|
The clock frequency of the MII bus
|
|
|
|
CONFIG_PHY_GIGE
|
|
|
|
If this option is set, support for speed/duplex
|
|
detection of gigabit PHY is included.
|
|
|
|
CONFIG_PHY_RESET_DELAY
|
|
|
|
Some PHY like Intel LXT971A need extra delay after
|
|
reset before any MII register access is possible.
|
|
For such PHY, set this option to the usec delay
|
|
required. (minimum 300usec for LXT971A)
|
|
|
|
CONFIG_PHY_CMD_DELAY (ppc4xx)
|
|
|
|
Some PHY like Intel LXT971A need extra delay after
|
|
command issued before MII status register can be read
|
|
|
|
- Ethernet address:
|
|
CONFIG_ETHADDR
|
|
CONFIG_ETH1ADDR
|
|
CONFIG_ETH2ADDR
|
|
CONFIG_ETH3ADDR
|
|
CONFIG_ETH4ADDR
|
|
CONFIG_ETH5ADDR
|
|
|
|
Define a default value for Ethernet address to use
|
|
for the respective Ethernet interface, in case this
|
|
is not determined automatically.
|
|
|
|
- IP address:
|
|
CONFIG_IPADDR
|
|
|
|
Define a default value for the IP address to use for
|
|
the default Ethernet interface, in case this is not
|
|
determined through e.g. bootp.
|
|
(Environment variable "ipaddr")
|
|
|
|
- Server IP address:
|
|
CONFIG_SERVERIP
|
|
|
|
Defines a default value for the IP address of a TFTP
|
|
server to contact when using the "tftboot" command.
|
|
(Environment variable "serverip")
|
|
|
|
CONFIG_KEEP_SERVERADDR
|
|
|
|
Keeps the server's MAC address, in the env 'serveraddr'
|
|
for passing to bootargs (like Linux's netconsole option)
|
|
|
|
- Gateway IP address:
|
|
CONFIG_GATEWAYIP
|
|
|
|
Defines a default value for the IP address of the
|
|
default router where packets to other networks are
|
|
sent to.
|
|
(Environment variable "gatewayip")
|
|
|
|
- Subnet mask:
|
|
CONFIG_NETMASK
|
|
|
|
Defines a default value for the subnet mask (or
|
|
routing prefix) which is used to determine if an IP
|
|
address belongs to the local subnet or needs to be
|
|
forwarded through a router.
|
|
(Environment variable "netmask")
|
|
|
|
- Multicast TFTP Mode:
|
|
CONFIG_MCAST_TFTP
|
|
|
|
Defines whether you want to support multicast TFTP as per
|
|
rfc-2090; for example to work with atftp. Lets lots of targets
|
|
tftp down the same boot image concurrently. Note: the Ethernet
|
|
driver in use must provide a function: mcast() to join/leave a
|
|
multicast group.
|
|
|
|
- BOOTP Recovery Mode:
|
|
CONFIG_BOOTP_RANDOM_DELAY
|
|
|
|
If you have many targets in a network that try to
|
|
boot using BOOTP, you may want to avoid that all
|
|
systems send out BOOTP requests at precisely the same
|
|
moment (which would happen for instance at recovery
|
|
from a power failure, when all systems will try to
|
|
boot, thus flooding the BOOTP server. Defining
|
|
CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
|
|
inserted before sending out BOOTP requests. The
|
|
following delays are inserted then:
|
|
|
|
1st BOOTP request: delay 0 ... 1 sec
|
|
2nd BOOTP request: delay 0 ... 2 sec
|
|
3rd BOOTP request: delay 0 ... 4 sec
|
|
4th and following
|
|
BOOTP requests: delay 0 ... 8 sec
|
|
|
|
- DHCP Advanced Options:
|
|
You can fine tune the DHCP functionality by defining
|
|
CONFIG_BOOTP_* symbols:
|
|
|
|
CONFIG_BOOTP_SUBNETMASK
|
|
CONFIG_BOOTP_GATEWAY
|
|
CONFIG_BOOTP_HOSTNAME
|
|
CONFIG_BOOTP_NISDOMAIN
|
|
CONFIG_BOOTP_BOOTPATH
|
|
CONFIG_BOOTP_BOOTFILESIZE
|
|
CONFIG_BOOTP_DNS
|
|
CONFIG_BOOTP_DNS2
|
|
CONFIG_BOOTP_SEND_HOSTNAME
|
|
CONFIG_BOOTP_NTPSERVER
|
|
CONFIG_BOOTP_TIMEOFFSET
|
|
CONFIG_BOOTP_VENDOREX
|
|
|
|
CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
|
|
environment variable, not the BOOTP server.
|
|
|
|
CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
|
|
serverip from a DHCP server, it is possible that more
|
|
than one DNS serverip is offered to the client.
|
|
If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
|
|
serverip will be stored in the additional environment
|
|
variable "dnsip2". The first DNS serverip is always
|
|
stored in the variable "dnsip", when CONFIG_BOOTP_DNS
|
|
is defined.
|
|
|
|
CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
|
|
to do a dynamic update of a DNS server. To do this, they
|
|
need the hostname of the DHCP requester.
|
|
If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
|
|
of the "hostname" environment variable is passed as
|
|
option 12 to the DHCP server.
|
|
|
|
CONFIG_BOOTP_DHCP_REQUEST_DELAY
|
|
|
|
A 32bit value in microseconds for a delay between
|
|
receiving a "DHCP Offer" and sending the "DHCP Request".
|
|
This fixes a problem with certain DHCP servers that don't
|
|
respond 100% of the time to a "DHCP request". E.g. On an
|
|
AT91RM9200 processor running at 180MHz, this delay needed
|
|
to be *at least* 15,000 usec before a Windows Server 2003
|
|
DHCP server would reply 100% of the time. I recommend at
|
|
least 50,000 usec to be safe. The alternative is to hope
|
|
that one of the retries will be successful but note that
|
|
the DHCP timeout and retry process takes a longer than
|
|
this delay.
|
|
|
|
- CDP Options:
|
|
CONFIG_CDP_DEVICE_ID
|
|
|
|
The device id used in CDP trigger frames.
|
|
|
|
CONFIG_CDP_DEVICE_ID_PREFIX
|
|
|
|
A two character string which is prefixed to the MAC address
|
|
of the device.
|
|
|
|
CONFIG_CDP_PORT_ID
|
|
|
|
A printf format string which contains the ascii name of
|
|
the port. Normally is set to "eth%d" which sets
|
|
eth0 for the first Ethernet, eth1 for the second etc.
|
|
|
|
CONFIG_CDP_CAPABILITIES
|
|
|
|
A 32bit integer which indicates the device capabilities;
|
|
0x00000010 for a normal host which does not forwards.
|
|
|
|
CONFIG_CDP_VERSION
|
|
|
|
An ascii string containing the version of the software.
|
|
|
|
CONFIG_CDP_PLATFORM
|
|
|
|
An ascii string containing the name of the platform.
|
|
|
|
CONFIG_CDP_TRIGGER
|
|
|
|
A 32bit integer sent on the trigger.
|
|
|
|
CONFIG_CDP_POWER_CONSUMPTION
|
|
|
|
A 16bit integer containing the power consumption of the
|
|
device in .1 of milliwatts.
|
|
|
|
CONFIG_CDP_APPLIANCE_VLAN_TYPE
|
|
|
|
A byte containing the id of the VLAN.
|
|
|
|
- Status LED: CONFIG_STATUS_LED
|
|
|
|
Several configurations allow to display the current
|
|
status using a LED. For instance, the LED will blink
|
|
fast while running U-Boot code, stop blinking as
|
|
soon as a reply to a BOOTP request was received, and
|
|
start blinking slow once the Linux kernel is running
|
|
(supported by a status LED driver in the Linux
|
|
kernel). Defining CONFIG_STATUS_LED enables this
|
|
feature in U-Boot.
|
|
|
|
- CAN Support: CONFIG_CAN_DRIVER
|
|
|
|
Defining CONFIG_CAN_DRIVER enables CAN driver support
|
|
on those systems that support this (optional)
|
|
feature, like the TQM8xxL modules.
|
|
|
|
- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
|
|
|
|
These enable I2C serial bus commands. Defining either of
|
|
(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
|
|
include the appropriate I2C driver for the selected CPU.
|
|
|
|
This will allow you to use i2c commands at the u-boot
|
|
command line (as long as you set CONFIG_CMD_I2C in
|
|
CONFIG_COMMANDS) and communicate with i2c based realtime
|
|
clock chips. See common/cmd_i2c.c for a description of the
|
|
command line interface.
|
|
|
|
CONFIG_HARD_I2C selects a hardware I2C controller.
|
|
|
|
CONFIG_SOFT_I2C configures u-boot to use a software (aka
|
|
bit-banging) driver instead of CPM or similar hardware
|
|
support for I2C.
|
|
|
|
There are several other quantities that must also be
|
|
defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
|
|
|
|
In both cases you will need to define CONFIG_SYS_I2C_SPEED
|
|
to be the frequency (in Hz) at which you wish your i2c bus
|
|
to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
|
|
the CPU's i2c node address).
|
|
|
|
Now, the u-boot i2c code for the mpc8xx
|
|
(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
|
|
and so its address should therefore be cleared to 0 (See,
|
|
eg, MPC823e User's Manual p.16-473). So, set
|
|
CONFIG_SYS_I2C_SLAVE to 0.
|
|
|
|
CONFIG_SYS_I2C_INIT_MPC5XXX
|
|
|
|
When a board is reset during an i2c bus transfer
|
|
chips might think that the current transfer is still
|
|
in progress. Reset the slave devices by sending start
|
|
commands until the slave device responds.
|
|
|
|
That's all that's required for CONFIG_HARD_I2C.
|
|
|
|
If you use the software i2c interface (CONFIG_SOFT_I2C)
|
|
then the following macros need to be defined (examples are
|
|
from include/configs/lwmon.h):
|
|
|
|
I2C_INIT
|
|
|
|
(Optional). Any commands necessary to enable the I2C
|
|
controller or configure ports.
|
|
|
|
eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
|
|
|
|
I2C_PORT
|
|
|
|
(Only for MPC8260 CPU). The I/O port to use (the code
|
|
assumes both bits are on the same port). Valid values
|
|
are 0..3 for ports A..D.
|
|
|
|
I2C_ACTIVE
|
|
|
|
The code necessary to make the I2C data line active
|
|
(driven). If the data line is open collector, this
|
|
define can be null.
|
|
|
|
eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
|
|
|
|
I2C_TRISTATE
|
|
|
|
The code necessary to make the I2C data line tri-stated
|
|
(inactive). If the data line is open collector, this
|
|
define can be null.
|
|
|
|
eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
|
|
|
|
I2C_READ
|
|
|
|
Code that returns TRUE if the I2C data line is high,
|
|
FALSE if it is low.
|
|
|
|
eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
|
|
|
|
I2C_SDA(bit)
|
|
|
|
If <bit> is TRUE, sets the I2C data line high. If it
|
|
is FALSE, it clears it (low).
|
|
|
|
eg: #define I2C_SDA(bit) \
|
|
if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
|
|
else immr->im_cpm.cp_pbdat &= ~PB_SDA
|
|
|
|
I2C_SCL(bit)
|
|
|
|
If <bit> is TRUE, sets the I2C clock line high. If it
|
|
is FALSE, it clears it (low).
|
|
|
|
eg: #define I2C_SCL(bit) \
|
|
if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
|
|
else immr->im_cpm.cp_pbdat &= ~PB_SCL
|
|
|
|
I2C_DELAY
|
|
|
|
This delay is invoked four times per clock cycle so this
|
|
controls the rate of data transfer. The data rate thus
|
|
is 1 / (I2C_DELAY * 4). Often defined to be something
|
|
like:
|
|
|
|
#define I2C_DELAY udelay(2)
|
|
|
|
CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
|
|
|
|
If your arch supports the generic GPIO framework (asm/gpio.h),
|
|
then you may alternatively define the two GPIOs that are to be
|
|
used as SCL / SDA. Any of the previous I2C_xxx macros will
|
|
have GPIO-based defaults assigned to them as appropriate.
|
|
|
|
You should define these to the GPIO value as given directly to
|
|
the generic GPIO functions.
|
|
|
|
CONFIG_SYS_I2C_INIT_BOARD
|
|
|
|
When a board is reset during an i2c bus transfer
|
|
chips might think that the current transfer is still
|
|
in progress. On some boards it is possible to access
|
|
the i2c SCLK line directly, either by using the
|
|
processor pin as a GPIO or by having a second pin
|
|
connected to the bus. If this option is defined a
|
|
custom i2c_init_board() routine in boards/xxx/board.c
|
|
is run early in the boot sequence.
|
|
|
|
CONFIG_SYS_I2C_BOARD_LATE_INIT
|
|
|
|
An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
|
|
defined a custom i2c_board_late_init() routine in
|
|
boards/xxx/board.c is run AFTER the operations in i2c_init()
|
|
is completed. This callpoint can be used to unreset i2c bus
|
|
using CPU i2c controller register accesses for CPUs whose i2c
|
|
controller provide such a method. It is called at the end of
|
|
i2c_init() to allow i2c_init operations to setup the i2c bus
|
|
controller on the CPU (e.g. setting bus speed & slave address).
|
|
|
|
CONFIG_I2CFAST (PPC405GP|PPC405EP only)
|
|
|
|
This option enables configuration of bi_iic_fast[] flags
|
|
in u-boot bd_info structure based on u-boot environment
|
|
variable "i2cfast". (see also i2cfast)
|
|
|
|
CONFIG_I2C_MULTI_BUS
|
|
|
|
This option allows the use of multiple I2C buses, each of which
|
|
must have a controller. At any point in time, only one bus is
|
|
active. To switch to a different bus, use the 'i2c dev' command.
|
|
Note that bus numbering is zero-based.
|
|
|
|
CONFIG_SYS_I2C_NOPROBES
|
|
|
|
This option specifies a list of I2C devices that will be skipped
|
|
when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
|
|
is set, specify a list of bus-device pairs. Otherwise, specify
|
|
a 1D array of device addresses
|
|
|
|
e.g.
|
|
#undef CONFIG_I2C_MULTI_BUS
|
|
#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
|
|
|
|
will skip addresses 0x50 and 0x68 on a board with one I2C bus
|
|
|
|
#define CONFIG_I2C_MULTI_BUS
|
|
#define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
|
|
|
|
will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
|
|
|
|
CONFIG_SYS_SPD_BUS_NUM
|
|
|
|
If defined, then this indicates the I2C bus number for DDR SPD.
|
|
If not defined, then U-Boot assumes that SPD is on I2C bus 0.
|
|
|
|
CONFIG_SYS_RTC_BUS_NUM
|
|
|
|
If defined, then this indicates the I2C bus number for the RTC.
|
|
If not defined, then U-Boot assumes that RTC is on I2C bus 0.
|
|
|
|
CONFIG_SYS_DTT_BUS_NUM
|
|
|
|
If defined, then this indicates the I2C bus number for the DTT.
|
|
If not defined, then U-Boot assumes that DTT is on I2C bus 0.
|
|
|
|
CONFIG_SYS_I2C_DTT_ADDR:
|
|
|
|
If defined, specifies the I2C address of the DTT device.
|
|
If not defined, then U-Boot uses predefined value for
|
|
specified DTT device.
|
|
|
|
CONFIG_FSL_I2C
|
|
|
|
Define this option if you want to use Freescale's I2C driver in
|
|
drivers/i2c/fsl_i2c.c.
|
|
|
|
CONFIG_I2C_MUX
|
|
|
|
Define this option if you have I2C devices reached over 1 .. n
|
|
I2C Muxes like the pca9544a. This option addes a new I2C
|
|
Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
|
|
new I2C Bus to the existing I2C Busses. If you select the
|
|
new Bus with "i2c dev", u-bbot sends first the commandos for
|
|
the muxes to activate this new "bus".
|
|
|
|
CONFIG_I2C_MULTI_BUS must be also defined, to use this
|
|
feature!
|
|
|
|
Example:
|
|
Adding a new I2C Bus reached over 2 pca9544a muxes
|
|
The First mux with address 70 and channel 6
|
|
The Second mux with address 71 and channel 4
|
|
|
|
=> i2c bus pca9544a:70:6:pca9544a:71:4
|
|
|
|
Use the "i2c bus" command without parameter, to get a list
|
|
of I2C Busses with muxes:
|
|
|
|
=> i2c bus
|
|
Busses reached over muxes:
|
|
Bus ID: 2
|
|
reached over Mux(es):
|
|
pca9544a@70 ch: 4
|
|
Bus ID: 3
|
|
reached over Mux(es):
|
|
pca9544a@70 ch: 6
|
|
pca9544a@71 ch: 4
|
|
=>
|
|
|
|
If you now switch to the new I2C Bus 3 with "i2c dev 3"
|
|
u-boot first sends the command to the mux@70 to enable
|
|
channel 6, and then the command to the mux@71 to enable
|
|
the channel 4.
|
|
|
|
After that, you can use the "normal" i2c commands as
|
|
usual to communicate with your I2C devices behind
|
|
the 2 muxes.
|
|
|
|
This option is actually implemented for the bitbanging
|
|
algorithm in common/soft_i2c.c and for the Hardware I2C
|
|
Bus on the MPC8260. But it should be not so difficult
|
|
to add this option to other architectures.
|
|
|
|
CONFIG_SOFT_I2C_READ_REPEATED_START
|
|
|
|
defining this will force the i2c_read() function in
|
|
the soft_i2c driver to perform an I2C repeated start
|
|
between writing the address pointer and reading the
|
|
data. If this define is omitted the default behaviour
|
|
of doing a stop-start sequence will be used. Most I2C
|
|
devices can use either method, but some require one or
|
|
the other.
|
|
|
|
- SPI Support: CONFIG_SPI
|
|
|
|
Enables SPI driver (so far only tested with
|
|
SPI EEPROM, also an instance works with Crystal A/D and
|
|
D/As on the SACSng board)
|
|
|
|
CONFIG_SH_SPI
|
|
|
|
Enables the driver for SPI controller on SuperH. Currently
|
|
only SH7757 is supported.
|
|
|
|
CONFIG_SPI_X
|
|
|
|
Enables extended (16-bit) SPI EEPROM addressing.
|
|
(symmetrical to CONFIG_I2C_X)
|
|
|
|
CONFIG_SOFT_SPI
|
|
|
|
Enables a software (bit-bang) SPI driver rather than
|
|
using hardware support. This is a general purpose
|
|
driver that only requires three general I/O port pins
|
|
(two outputs, one input) to function. If this is
|
|
defined, the board configuration must define several
|
|
SPI configuration items (port pins to use, etc). For
|
|
an example, see include/configs/sacsng.h.
|
|
|
|
CONFIG_HARD_SPI
|
|
|
|
Enables a hardware SPI driver for general-purpose reads
|
|
and writes. As with CONFIG_SOFT_SPI, the board configuration
|
|
must define a list of chip-select function pointers.
|
|
Currently supported on some MPC8xxx processors. For an
|
|
example, see include/configs/mpc8349emds.h.
|
|
|
|
CONFIG_MXC_SPI
|
|
|
|
Enables the driver for the SPI controllers on i.MX and MXC
|
|
SoCs. Currently only i.MX31 is supported.
|
|
|
|
- FPGA Support: CONFIG_FPGA
|
|
|
|
Enables FPGA subsystem.
|
|
|
|
CONFIG_FPGA_<vendor>
|
|
|
|
Enables support for specific chip vendors.
|
|
(ALTERA, XILINX)
|
|
|
|
CONFIG_FPGA_<family>
|
|
|
|
Enables support for FPGA family.
|
|
(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
|
|
|
|
CONFIG_FPGA_COUNT
|
|
|
|
Specify the number of FPGA devices to support.
|
|
|
|
CONFIG_SYS_FPGA_PROG_FEEDBACK
|
|
|
|
Enable printing of hash marks during FPGA configuration.
|
|
|
|
CONFIG_SYS_FPGA_CHECK_BUSY
|
|
|
|
Enable checks on FPGA configuration interface busy
|
|
status by the configuration function. This option
|
|
will require a board or device specific function to
|
|
be written.
|
|
|
|
CONFIG_FPGA_DELAY
|
|
|
|
If defined, a function that provides delays in the FPGA
|
|
configuration driver.
|
|
|
|
CONFIG_SYS_FPGA_CHECK_CTRLC
|
|
Allow Control-C to interrupt FPGA configuration
|
|
|
|
CONFIG_SYS_FPGA_CHECK_ERROR
|
|
|
|
Check for configuration errors during FPGA bitfile
|
|
loading. For example, abort during Virtex II
|
|
configuration if the INIT_B line goes low (which
|
|
indicated a CRC error).
|
|
|
|
CONFIG_SYS_FPGA_WAIT_INIT
|
|
|
|
Maximum time to wait for the INIT_B line to deassert
|
|
after PROB_B has been deasserted during a Virtex II
|
|
FPGA configuration sequence. The default time is 500
|
|
ms.
|
|
|
|
CONFIG_SYS_FPGA_WAIT_BUSY
|
|
|
|
Maximum time to wait for BUSY to deassert during
|
|
Virtex II FPGA configuration. The default is 5 ms.
|
|
|
|
CONFIG_SYS_FPGA_WAIT_CONFIG
|
|
|
|
Time to wait after FPGA configuration. The default is
|
|
200 ms.
|
|
|
|
- Configuration Management:
|
|
CONFIG_IDENT_STRING
|
|
|
|
If defined, this string will be added to the U-Boot
|
|
version information (U_BOOT_VERSION)
|
|
|
|
- Vendor Parameter Protection:
|
|
|
|
U-Boot considers the values of the environment
|
|
variables "serial#" (Board Serial Number) and
|
|
"ethaddr" (Ethernet Address) to be parameters that
|
|
are set once by the board vendor / manufacturer, and
|
|
protects these variables from casual modification by
|
|
the user. Once set, these variables are read-only,
|
|
and write or delete attempts are rejected. You can
|
|
change this behaviour:
|
|
|
|
If CONFIG_ENV_OVERWRITE is #defined in your config
|
|
file, the write protection for vendor parameters is
|
|
completely disabled. Anybody can change or delete
|
|
these parameters.
|
|
|
|
Alternatively, if you #define _both_ CONFIG_ETHADDR
|
|
_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
|
|
Ethernet address is installed in the environment,
|
|
which can be changed exactly ONCE by the user. [The
|
|
serial# is unaffected by this, i. e. it remains
|
|
read-only.]
|
|
|
|
- Protected RAM:
|
|
CONFIG_PRAM
|
|
|
|
Define this variable to enable the reservation of
|
|
"protected RAM", i. e. RAM which is not overwritten
|
|
by U-Boot. Define CONFIG_PRAM to hold the number of
|
|
kB you want to reserve for pRAM. You can overwrite
|
|
this default value by defining an environment
|
|
variable "pram" to the number of kB you want to
|
|
reserve. Note that the board info structure will
|
|
still show the full amount of RAM. If pRAM is
|
|
reserved, a new environment variable "mem" will
|
|
automatically be defined to hold the amount of
|
|
remaining RAM in a form that can be passed as boot
|
|
argument to Linux, for instance like that:
|
|
|
|
setenv bootargs ... mem=\${mem}
|
|
saveenv
|
|
|
|
This way you can tell Linux not to use this memory,
|
|
either, which results in a memory region that will
|
|
not be affected by reboots.
|
|
|
|
*WARNING* If your board configuration uses automatic
|
|
detection of the RAM size, you must make sure that
|
|
this memory test is non-destructive. So far, the
|
|
following board configurations are known to be
|
|
"pRAM-clean":
|
|
|
|
ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
|
|
HERMES, IP860, RPXlite, LWMON, LANTEC,
|
|
FLAGADM, TQM8260
|
|
|
|
- Error Recovery:
|
|
CONFIG_PANIC_HANG
|
|
|
|
Define this variable to stop the system in case of a
|
|
fatal error, so that you have to reset it manually.
|
|
This is probably NOT a good idea for an embedded
|
|
system where you want the system to reboot
|
|
automatically as fast as possible, but it may be
|
|
useful during development since you can try to debug
|
|
the conditions that lead to the situation.
|
|
|
|
CONFIG_NET_RETRY_COUNT
|
|
|
|
This variable defines the number of retries for
|
|
network operations like ARP, RARP, TFTP, or BOOTP
|
|
before giving up the operation. If not defined, a
|
|
default value of 5 is used.
|
|
|
|
CONFIG_ARP_TIMEOUT
|
|
|
|
Timeout waiting for an ARP reply in milliseconds.
|
|
|
|
- Command Interpreter:
|
|
CONFIG_AUTO_COMPLETE
|
|
|
|
Enable auto completion of commands using TAB.
|
|
|
|
Note that this feature has NOT been implemented yet
|
|
for the "hush" shell.
|
|
|
|
|
|
CONFIG_SYS_HUSH_PARSER
|
|
|
|
Define this variable to enable the "hush" shell (from
|
|
Busybox) as command line interpreter, thus enabling
|
|
powerful command line syntax like
|
|
if...then...else...fi conditionals or `&&' and '||'
|
|
constructs ("shell scripts").
|
|
|
|
If undefined, you get the old, much simpler behaviour
|
|
with a somewhat smaller memory footprint.
|
|
|
|
|
|
CONFIG_SYS_PROMPT_HUSH_PS2
|
|
|
|
This defines the secondary prompt string, which is
|
|
printed when the command interpreter needs more input
|
|
to complete a command. Usually "> ".
|
|
|
|
Note:
|
|
|
|
In the current implementation, the local variables
|
|
space and global environment variables space are
|
|
separated. Local variables are those you define by
|
|
simply typing `name=value'. To access a local
|
|
variable later on, you have write `$name' or
|
|
`${name}'; to execute the contents of a variable
|
|
directly type `$name' at the command prompt.
|
|
|
|
Global environment variables are those you use
|
|
setenv/printenv to work with. To run a command stored
|
|
in such a variable, you need to use the run command,
|
|
and you must not use the '$' sign to access them.
|
|
|
|
To store commands and special characters in a
|
|
variable, please use double quotation marks
|
|
surrounding the whole text of the variable, instead
|
|
of the backslashes before semicolons and special
|
|
symbols.
|
|
|
|
- Commandline Editing and History:
|
|
CONFIG_CMDLINE_EDITING
|
|
|
|
Enable editing and History functions for interactive
|
|
commandline input operations
|
|
|
|
- Default Environment:
|
|
CONFIG_EXTRA_ENV_SETTINGS
|
|
|
|
Define this to contain any number of null terminated
|
|
strings (variable = value pairs) that will be part of
|
|
the default environment compiled into the boot image.
|
|
|
|
For example, place something like this in your
|
|
board's config file:
|
|
|
|
#define CONFIG_EXTRA_ENV_SETTINGS \
|
|
"myvar1=value1\0" \
|
|
"myvar2=value2\0"
|
|
|
|
Warning: This method is based on knowledge about the
|
|
internal format how the environment is stored by the
|
|
U-Boot code. This is NOT an official, exported
|
|
interface! Although it is unlikely that this format
|
|
will change soon, there is no guarantee either.
|
|
You better know what you are doing here.
|
|
|
|
Note: overly (ab)use of the default environment is
|
|
discouraged. Make sure to check other ways to preset
|
|
the environment like the "source" command or the
|
|
boot command first.
|
|
|
|
- DataFlash Support:
|
|
CONFIG_HAS_DATAFLASH
|
|
|
|
Defining this option enables DataFlash features and
|
|
allows to read/write in Dataflash via the standard
|
|
commands cp, md...
|
|
|
|
- SystemACE Support:
|
|
CONFIG_SYSTEMACE
|
|
|
|
Adding this option adds support for Xilinx SystemACE
|
|
chips attached via some sort of local bus. The address
|
|
of the chip must also be defined in the
|
|
CONFIG_SYS_SYSTEMACE_BASE macro. For example:
|
|
|
|
#define CONFIG_SYSTEMACE
|
|
#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
|
|
|
|
When SystemACE support is added, the "ace" device type
|
|
becomes available to the fat commands, i.e. fatls.
|
|
|
|
- TFTP Fixed UDP Port:
|
|
CONFIG_TFTP_PORT
|
|
|
|
If this is defined, the environment variable tftpsrcp
|
|
is used to supply the TFTP UDP source port value.
|
|
If tftpsrcp isn't defined, the normal pseudo-random port
|
|
number generator is used.
|
|
|
|
Also, the environment variable tftpdstp is used to supply
|
|
the TFTP UDP destination port value. If tftpdstp isn't
|
|
defined, the normal port 69 is used.
|
|
|
|
The purpose for tftpsrcp is to allow a TFTP server to
|
|
blindly start the TFTP transfer using the pre-configured
|
|
target IP address and UDP port. This has the effect of
|
|
"punching through" the (Windows XP) firewall, allowing
|
|
the remainder of the TFTP transfer to proceed normally.
|
|
A better solution is to properly configure the firewall,
|
|
but sometimes that is not allowed.
|
|
|
|
- Show boot progress:
|
|
CONFIG_SHOW_BOOT_PROGRESS
|
|
|
|
Defining this option allows to add some board-
|
|
specific code (calling a user-provided function
|
|
"show_boot_progress(int)") that enables you to show
|
|
the system's boot progress on some display (for
|
|
example, some LED's) on your board. At the moment,
|
|
the following checkpoints are implemented:
|
|
|
|
Legacy uImage format:
|
|
|
|
Arg Where When
|
|
1 common/cmd_bootm.c before attempting to boot an image
|
|
-1 common/cmd_bootm.c Image header has bad magic number
|
|
2 common/cmd_bootm.c Image header has correct magic number
|
|
-2 common/cmd_bootm.c Image header has bad checksum
|
|
3 common/cmd_bootm.c Image header has correct checksum
|
|
-3 common/cmd_bootm.c Image data has bad checksum
|
|
4 common/cmd_bootm.c Image data has correct checksum
|
|
-4 common/cmd_bootm.c Image is for unsupported architecture
|
|
5 common/cmd_bootm.c Architecture check OK
|
|
-5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
|
|
6 common/cmd_bootm.c Image Type check OK
|
|
-6 common/cmd_bootm.c gunzip uncompression error
|
|
-7 common/cmd_bootm.c Unimplemented compression type
|
|
7 common/cmd_bootm.c Uncompression OK
|
|
8 common/cmd_bootm.c No uncompress/copy overwrite error
|
|
-9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
|
|
|
|
9 common/image.c Start initial ramdisk verification
|
|
-10 common/image.c Ramdisk header has bad magic number
|
|
-11 common/image.c Ramdisk header has bad checksum
|
|
10 common/image.c Ramdisk header is OK
|
|
-12 common/image.c Ramdisk data has bad checksum
|
|
11 common/image.c Ramdisk data has correct checksum
|
|
12 common/image.c Ramdisk verification complete, start loading
|
|
-13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
|
|
13 common/image.c Start multifile image verification
|
|
14 common/image.c No initial ramdisk, no multifile, continue.
|
|
|
|
15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
|
|
|
|
-30 arch/powerpc/lib/board.c Fatal error, hang the system
|
|
-31 post/post.c POST test failed, detected by post_output_backlog()
|
|
-32 post/post.c POST test failed, detected by post_run_single()
|
|
|
|
34 common/cmd_doc.c before loading a Image from a DOC device
|
|
-35 common/cmd_doc.c Bad usage of "doc" command
|
|
35 common/cmd_doc.c correct usage of "doc" command
|
|
-36 common/cmd_doc.c No boot device
|
|
36 common/cmd_doc.c correct boot device
|
|
-37 common/cmd_doc.c Unknown Chip ID on boot device
|
|
37 common/cmd_doc.c correct chip ID found, device available
|
|
-38 common/cmd_doc.c Read Error on boot device
|
|
38 common/cmd_doc.c reading Image header from DOC device OK
|
|
-39 common/cmd_doc.c Image header has bad magic number
|
|
39 common/cmd_doc.c Image header has correct magic number
|
|
-40 common/cmd_doc.c Error reading Image from DOC device
|
|
40 common/cmd_doc.c Image header has correct magic number
|
|
41 common/cmd_ide.c before loading a Image from a IDE device
|
|
-42 common/cmd_ide.c Bad usage of "ide" command
|
|
42 common/cmd_ide.c correct usage of "ide" command
|
|
-43 common/cmd_ide.c No boot device
|
|
43 common/cmd_ide.c boot device found
|
|
-44 common/cmd_ide.c Device not available
|
|
44 common/cmd_ide.c Device available
|
|
-45 common/cmd_ide.c wrong partition selected
|
|
45 common/cmd_ide.c partition selected
|
|
-46 common/cmd_ide.c Unknown partition table
|
|
46 common/cmd_ide.c valid partition table found
|
|
-47 common/cmd_ide.c Invalid partition type
|
|
47 common/cmd_ide.c correct partition type
|
|
-48 common/cmd_ide.c Error reading Image Header on boot device
|
|
48 common/cmd_ide.c reading Image Header from IDE device OK
|
|
-49 common/cmd_ide.c Image header has bad magic number
|
|
49 common/cmd_ide.c Image header has correct magic number
|
|
-50 common/cmd_ide.c Image header has bad checksum
|
|
50 common/cmd_ide.c Image header has correct checksum
|
|
-51 common/cmd_ide.c Error reading Image from IDE device
|
|
51 common/cmd_ide.c reading Image from IDE device OK
|
|
52 common/cmd_nand.c before loading a Image from a NAND device
|
|
-53 common/cmd_nand.c Bad usage of "nand" command
|
|
53 common/cmd_nand.c correct usage of "nand" command
|
|
-54 common/cmd_nand.c No boot device
|
|
54 common/cmd_nand.c boot device found
|
|
-55 common/cmd_nand.c Unknown Chip ID on boot device
|
|
55 common/cmd_nand.c correct chip ID found, device available
|
|
-56 common/cmd_nand.c Error reading Image Header on boot device
|
|
56 common/cmd_nand.c reading Image Header from NAND device OK
|
|
-57 common/cmd_nand.c Image header has bad magic number
|
|
57 common/cmd_nand.c Image header has correct magic number
|
|
-58 common/cmd_nand.c Error reading Image from NAND device
|
|
58 common/cmd_nand.c reading Image from NAND device OK
|
|
|
|
-60 common/env_common.c Environment has a bad CRC, using default
|
|
|
|
64 net/eth.c starting with Ethernet configuration.
|
|
-64 net/eth.c no Ethernet found.
|
|
65 net/eth.c Ethernet found.
|
|
|
|
-80 common/cmd_net.c usage wrong
|
|
80 common/cmd_net.c before calling NetLoop()
|
|
-81 common/cmd_net.c some error in NetLoop() occurred
|
|
81 common/cmd_net.c NetLoop() back without error
|
|
-82 common/cmd_net.c size == 0 (File with size 0 loaded)
|
|
82 common/cmd_net.c trying automatic boot
|
|
83 common/cmd_net.c running "source" command
|
|
-83 common/cmd_net.c some error in automatic boot or "source" command
|
|
84 common/cmd_net.c end without errors
|
|
|
|
FIT uImage format:
|
|
|
|
Arg Where When
|
|
100 common/cmd_bootm.c Kernel FIT Image has correct format
|
|
-100 common/cmd_bootm.c Kernel FIT Image has incorrect format
|
|
101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
|
|
-101 common/cmd_bootm.c Can't get configuration for kernel subimage
|
|
102 common/cmd_bootm.c Kernel unit name specified
|
|
-103 common/cmd_bootm.c Can't get kernel subimage node offset
|
|
103 common/cmd_bootm.c Found configuration node
|
|
104 common/cmd_bootm.c Got kernel subimage node offset
|
|
-104 common/cmd_bootm.c Kernel subimage hash verification failed
|
|
105 common/cmd_bootm.c Kernel subimage hash verification OK
|
|
-105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
|
|
106 common/cmd_bootm.c Architecture check OK
|
|
-106 common/cmd_bootm.c Kernel subimage has wrong type
|
|
107 common/cmd_bootm.c Kernel subimage type OK
|
|
-107 common/cmd_bootm.c Can't get kernel subimage data/size
|
|
108 common/cmd_bootm.c Got kernel subimage data/size
|
|
-108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
|
|
-109 common/cmd_bootm.c Can't get kernel subimage type
|
|
-110 common/cmd_bootm.c Can't get kernel subimage comp
|
|
-111 common/cmd_bootm.c Can't get kernel subimage os
|
|
-112 common/cmd_bootm.c Can't get kernel subimage load address
|
|
-113 common/cmd_bootm.c Image uncompress/copy overwrite error
|
|
|
|
120 common/image.c Start initial ramdisk verification
|
|
-120 common/image.c Ramdisk FIT image has incorrect format
|
|
121 common/image.c Ramdisk FIT image has correct format
|
|
122 common/image.c No ramdisk subimage unit name, using configuration
|
|
-122 common/image.c Can't get configuration for ramdisk subimage
|
|
123 common/image.c Ramdisk unit name specified
|
|
-124 common/image.c Can't get ramdisk subimage node offset
|
|
125 common/image.c Got ramdisk subimage node offset
|
|
-125 common/image.c Ramdisk subimage hash verification failed
|
|
126 common/image.c Ramdisk subimage hash verification OK
|
|
-126 common/image.c Ramdisk subimage for unsupported architecture
|
|
127 common/image.c Architecture check OK
|
|
-127 common/image.c Can't get ramdisk subimage data/size
|
|
128 common/image.c Got ramdisk subimage data/size
|
|
129 common/image.c Can't get ramdisk load address
|
|
-129 common/image.c Got ramdisk load address
|
|
|
|
-130 common/cmd_doc.c Incorrect FIT image format
|
|
131 common/cmd_doc.c FIT image format OK
|
|
|
|
-140 common/cmd_ide.c Incorrect FIT image format
|
|
141 common/cmd_ide.c FIT image format OK
|
|
|
|
-150 common/cmd_nand.c Incorrect FIT image format
|
|
151 common/cmd_nand.c FIT image format OK
|
|
|
|
- Standalone program support:
|
|
CONFIG_STANDALONE_LOAD_ADDR
|
|
|
|
This option defines a board specific value for the
|
|
address where standalone program gets loaded, thus
|
|
overwriting the architecture dependent default
|
|
settings.
|
|
|
|
- Frame Buffer Address:
|
|
CONFIG_FB_ADDR
|
|
|
|
Define CONFIG_FB_ADDR if you want to use specific
|
|
address for frame buffer.
|
|
Then system will reserve the frame buffer address to
|
|
defined address instead of lcd_setmem (this function
|
|
grabs the memory for frame buffer by panel's size).
|
|
|
|
Please see board_init_f function.
|
|
|
|
- Automatic software updates via TFTP server
|
|
CONFIG_UPDATE_TFTP
|
|
CONFIG_UPDATE_TFTP_CNT_MAX
|
|
CONFIG_UPDATE_TFTP_MSEC_MAX
|
|
|
|
These options enable and control the auto-update feature;
|
|
for a more detailed description refer to doc/README.update.
|
|
|
|
- MTD Support (mtdparts command, UBI support)
|
|
CONFIG_MTD_DEVICE
|
|
|
|
Adds the MTD device infrastructure from the Linux kernel.
|
|
Needed for mtdparts command support.
|
|
|
|
CONFIG_MTD_PARTITIONS
|
|
|
|
Adds the MTD partitioning infrastructure from the Linux
|
|
kernel. Needed for UBI support.
|
|
|
|
- SPL framework
|
|
CONFIG_SPL
|
|
Enable building of SPL globally.
|
|
|
|
CONFIG_SPL_TEXT_BASE
|
|
TEXT_BASE for linking the SPL binary.
|
|
|
|
CONFIG_SPL_LDSCRIPT
|
|
LDSCRIPT for linking the SPL binary.
|
|
|
|
CONFIG_SPL_LIBCOMMON_SUPPORT
|
|
Support for common/libcommon.o in SPL binary
|
|
|
|
CONFIG_SPL_LIBDISK_SUPPORT
|
|
Support for disk/libdisk.o in SPL binary
|
|
|
|
CONFIG_SPL_I2C_SUPPORT
|
|
Support for drivers/i2c/libi2c.o in SPL binary
|
|
|
|
CONFIG_SPL_GPIO_SUPPORT
|
|
Support for drivers/gpio/libgpio.o in SPL binary
|
|
|
|
CONFIG_SPL_MMC_SUPPORT
|
|
Support for drivers/mmc/libmmc.o in SPL binary
|
|
|
|
CONFIG_SPL_SERIAL_SUPPORT
|
|
Support for drivers/serial/libserial.o in SPL binary
|
|
|
|
CONFIG_SPL_SPI_FLASH_SUPPORT
|
|
Support for drivers/mtd/spi/libspi_flash.o in SPL binary
|
|
|
|
CONFIG_SPL_SPI_SUPPORT
|
|
Support for drivers/spi/libspi.o in SPL binary
|
|
|
|
CONFIG_SPL_FAT_SUPPORT
|
|
Support for fs/fat/libfat.o in SPL binary
|
|
|
|
CONFIG_SPL_LIBGENERIC_SUPPORT
|
|
Support for lib/libgeneric.o in SPL binary
|
|
|
|
Modem Support:
|
|
--------------
|
|
|
|
[so far only for SMDK2400 boards]
|
|
|
|
- Modem support enable:
|
|
CONFIG_MODEM_SUPPORT
|
|
|
|
- RTS/CTS Flow control enable:
|
|
CONFIG_HWFLOW
|
|
|
|
- Modem debug support:
|
|
CONFIG_MODEM_SUPPORT_DEBUG
|
|
|
|
Enables debugging stuff (char screen[1024], dbg())
|
|
for modem support. Useful only with BDI2000.
|
|
|
|
- Interrupt support (PPC):
|
|
|
|
There are common interrupt_init() and timer_interrupt()
|
|
for all PPC archs. interrupt_init() calls interrupt_init_cpu()
|
|
for CPU specific initialization. interrupt_init_cpu()
|
|
should set decrementer_count to appropriate value. If
|
|
CPU resets decrementer automatically after interrupt
|
|
(ppc4xx) it should set decrementer_count to zero.
|
|
timer_interrupt() calls timer_interrupt_cpu() for CPU
|
|
specific handling. If board has watchdog / status_led
|
|
/ other_activity_monitor it works automatically from
|
|
general timer_interrupt().
|
|
|
|
- General:
|
|
|
|
In the target system modem support is enabled when a
|
|
specific key (key combination) is pressed during
|
|
power-on. Otherwise U-Boot will boot normally
|
|
(autoboot). The key_pressed() function is called from
|
|
board_init(). Currently key_pressed() is a dummy
|
|
function, returning 1 and thus enabling modem
|
|
initialization.
|
|
|
|
If there are no modem init strings in the
|
|
environment, U-Boot proceed to autoboot; the
|
|
previous output (banner, info printfs) will be
|
|
suppressed, though.
|
|
|
|
See also: doc/README.Modem
|
|
|
|
Board initialization settings:
|
|
------------------------------
|
|
|
|
During Initialization u-boot calls a number of board specific functions
|
|
to allow the preparation of board specific prerequisites, e.g. pin setup
|
|
before drivers are initialized. To enable these callbacks the
|
|
following configuration macros have to be defined. Currently this is
|
|
architecture specific, so please check arch/your_architecture/lib/board.c
|
|
typically in board_init_f() and board_init_r().
|
|
|
|
- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
|
|
- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
|
|
- CONFIG_BOARD_LATE_INIT: Call board_late_init()
|
|
- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
|
|
|
|
Configuration Settings:
|
|
-----------------------
|
|
|
|
- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
|
|
undefine this when you're short of memory.
|
|
|
|
- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
|
|
width of the commands listed in the 'help' command output.
|
|
|
|
- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
|
|
prompt for user input.
|
|
|
|
- CONFIG_SYS_CBSIZE: Buffer size for input from the Console
|
|
|
|
- CONFIG_SYS_PBSIZE: Buffer size for Console output
|
|
|
|
- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
|
|
|
|
- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
|
|
the application (usually a Linux kernel) when it is
|
|
booted
|
|
|
|
- CONFIG_SYS_BAUDRATE_TABLE:
|
|
List of legal baudrate settings for this board.
|
|
|
|
- CONFIG_SYS_CONSOLE_INFO_QUIET
|
|
Suppress display of console information at boot.
|
|
|
|
- CONFIG_SYS_CONSOLE_IS_IN_ENV
|
|
If the board specific function
|
|
extern int overwrite_console (void);
|
|
returns 1, the stdin, stderr and stdout are switched to the
|
|
serial port, else the settings in the environment are used.
|
|
|
|
- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
|
|
Enable the call to overwrite_console().
|
|
|
|
- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
|
|
Enable overwrite of previous console environment settings.
|
|
|
|
- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
|
|
Begin and End addresses of the area used by the
|
|
simple memory test.
|
|
|
|
- CONFIG_SYS_ALT_MEMTEST:
|
|
Enable an alternate, more extensive memory test.
|
|
|
|
- CONFIG_SYS_MEMTEST_SCRATCH:
|
|
Scratch address used by the alternate memory test
|
|
You only need to set this if address zero isn't writeable
|
|
|
|
- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
|
|
If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
|
|
this specified memory area will get subtracted from the top
|
|
(end) of RAM and won't get "touched" at all by U-Boot. By
|
|
fixing up gd->ram_size the Linux kernel should gets passed
|
|
the now "corrected" memory size and won't touch it either.
|
|
This should work for arch/ppc and arch/powerpc. Only Linux
|
|
board ports in arch/powerpc with bootwrapper support that
|
|
recalculate the memory size from the SDRAM controller setup
|
|
will have to get fixed in Linux additionally.
|
|
|
|
This option can be used as a workaround for the 440EPx/GRx
|
|
CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
|
|
be touched.
|
|
|
|
WARNING: Please make sure that this value is a multiple of
|
|
the Linux page size (normally 4k). If this is not the case,
|
|
then the end address of the Linux memory will be located at a
|
|
non page size aligned address and this could cause major
|
|
problems.
|
|
|
|
- CONFIG_SYS_TFTP_LOADADDR:
|
|
Default load address for network file downloads
|
|
|
|
- CONFIG_SYS_LOADS_BAUD_CHANGE:
|
|
Enable temporary baudrate change while serial download
|
|
|
|
- CONFIG_SYS_SDRAM_BASE:
|
|
Physical start address of SDRAM. _Must_ be 0 here.
|
|
|
|
- CONFIG_SYS_MBIO_BASE:
|
|
Physical start address of Motherboard I/O (if using a
|
|
Cogent motherboard)
|
|
|
|
- CONFIG_SYS_FLASH_BASE:
|
|
Physical start address of Flash memory.
|
|
|
|
- CONFIG_SYS_MONITOR_BASE:
|
|
Physical start address of boot monitor code (set by
|
|
make config files to be same as the text base address
|
|
(CONFIG_SYS_TEXT_BASE) used when linking) - same as
|
|
CONFIG_SYS_FLASH_BASE when booting from flash.
|
|
|
|
- CONFIG_SYS_MONITOR_LEN:
|
|
Size of memory reserved for monitor code, used to
|
|
determine _at_compile_time_ (!) if the environment is
|
|
embedded within the U-Boot image, or in a separate
|
|
flash sector.
|
|
|
|
- CONFIG_SYS_MALLOC_LEN:
|
|
Size of DRAM reserved for malloc() use.
|
|
|
|
- CONFIG_SYS_BOOTM_LEN:
|
|
Normally compressed uImages are limited to an
|
|
uncompressed size of 8 MBytes. If this is not enough,
|
|
you can define CONFIG_SYS_BOOTM_LEN in your board config file
|
|
to adjust this setting to your needs.
|
|
|
|
- CONFIG_SYS_BOOTMAPSZ:
|
|
Maximum size of memory mapped by the startup code of
|
|
the Linux kernel; all data that must be processed by
|
|
the Linux kernel (bd_info, boot arguments, FDT blob if
|
|
used) must be put below this limit, unless "bootm_low"
|
|
enviroment variable is defined and non-zero. In such case
|
|
all data for the Linux kernel must be between "bootm_low"
|
|
and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
|
|
variable "bootm_mapsize" will override the value of
|
|
CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
|
|
then the value in "bootm_size" will be used instead.
|
|
|
|
- CONFIG_SYS_BOOT_RAMDISK_HIGH:
|
|
Enable initrd_high functionality. If defined then the
|
|
initrd_high feature is enabled and the bootm ramdisk subcommand
|
|
is enabled.
|
|
|
|
- CONFIG_SYS_BOOT_GET_CMDLINE:
|
|
Enables allocating and saving kernel cmdline in space between
|
|
"bootm_low" and "bootm_low" + BOOTMAPSZ.
|
|
|
|
- CONFIG_SYS_BOOT_GET_KBD:
|
|
Enables allocating and saving a kernel copy of the bd_info in
|
|
space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
|
|
|
|
- CONFIG_SYS_MAX_FLASH_BANKS:
|
|
Max number of Flash memory banks
|
|
|
|
- CONFIG_SYS_MAX_FLASH_SECT:
|
|
Max number of sectors on a Flash chip
|
|
|
|
- CONFIG_SYS_FLASH_ERASE_TOUT:
|
|
Timeout for Flash erase operations (in ms)
|
|
|
|
- CONFIG_SYS_FLASH_WRITE_TOUT:
|
|
Timeout for Flash write operations (in ms)
|
|
|
|
- CONFIG_SYS_FLASH_LOCK_TOUT
|
|
Timeout for Flash set sector lock bit operation (in ms)
|
|
|
|
- CONFIG_SYS_FLASH_UNLOCK_TOUT
|
|
Timeout for Flash clear lock bits operation (in ms)
|
|
|
|
- CONFIG_SYS_FLASH_PROTECTION
|
|
If defined, hardware flash sectors protection is used
|
|
instead of U-Boot software protection.
|
|
|
|
- CONFIG_SYS_DIRECT_FLASH_TFTP:
|
|
|
|
Enable TFTP transfers directly to flash memory;
|
|
without this option such a download has to be
|
|
performed in two steps: (1) download to RAM, and (2)
|
|
copy from RAM to flash.
|
|
|
|
The two-step approach is usually more reliable, since
|
|
you can check if the download worked before you erase
|
|
the flash, but in some situations (when system RAM is
|
|
too limited to allow for a temporary copy of the
|
|
downloaded image) this option may be very useful.
|
|
|
|
- CONFIG_SYS_FLASH_CFI:
|
|
Define if the flash driver uses extra elements in the
|
|
common flash structure for storing flash geometry.
|
|
|
|
- CONFIG_FLASH_CFI_DRIVER
|
|
This option also enables the building of the cfi_flash driver
|
|
in the drivers directory
|
|
|
|
- CONFIG_FLASH_CFI_MTD
|
|
This option enables the building of the cfi_mtd driver
|
|
in the drivers directory. The driver exports CFI flash
|
|
to the MTD layer.
|
|
|
|
- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
|
|
Use buffered writes to flash.
|
|
|
|
- CONFIG_FLASH_SPANSION_S29WS_N
|
|
s29ws-n MirrorBit flash has non-standard addresses for buffered
|
|
write commands.
|
|
|
|
- CONFIG_SYS_FLASH_QUIET_TEST
|
|
If this option is defined, the common CFI flash doesn't
|
|
print it's warning upon not recognized FLASH banks. This
|
|
is useful, if some of the configured banks are only
|
|
optionally available.
|
|
|
|
- CONFIG_FLASH_SHOW_PROGRESS
|
|
If defined (must be an integer), print out countdown
|
|
digits and dots. Recommended value: 45 (9..1) for 80
|
|
column displays, 15 (3..1) for 40 column displays.
|
|
|
|
- CONFIG_SYS_RX_ETH_BUFFER:
|
|
Defines the number of Ethernet receive buffers. On some
|
|
Ethernet controllers it is recommended to set this value
|
|
to 8 or even higher (EEPRO100 or 405 EMAC), since all
|
|
buffers can be full shortly after enabling the interface
|
|
on high Ethernet traffic.
|
|
Defaults to 4 if not defined.
|
|
|
|
- CONFIG_ENV_MAX_ENTRIES
|
|
|
|
Maximum number of entries in the hash table that is used
|
|
internally to store the environment settings. The default
|
|
setting is supposed to be generous and should work in most
|
|
cases. This setting can be used to tune behaviour; see
|
|
lib/hashtable.c for details.
|
|
|
|
The following definitions that deal with the placement and management
|
|
of environment data (variable area); in general, we support the
|
|
following configurations:
|
|
|
|
- CONFIG_BUILD_ENVCRC:
|
|
|
|
Builds up envcrc with the target environment so that external utils
|
|
may easily extract it and embed it in final U-Boot images.
|
|
|
|
- CONFIG_ENV_IS_IN_FLASH:
|
|
|
|
Define this if the environment is in flash memory.
|
|
|
|
a) The environment occupies one whole flash sector, which is
|
|
"embedded" in the text segment with the U-Boot code. This
|
|
happens usually with "bottom boot sector" or "top boot
|
|
sector" type flash chips, which have several smaller
|
|
sectors at the start or the end. For instance, such a
|
|
layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
|
|
such a case you would place the environment in one of the
|
|
4 kB sectors - with U-Boot code before and after it. With
|
|
"top boot sector" type flash chips, you would put the
|
|
environment in one of the last sectors, leaving a gap
|
|
between U-Boot and the environment.
|
|
|
|
- CONFIG_ENV_OFFSET:
|
|
|
|
Offset of environment data (variable area) to the
|
|
beginning of flash memory; for instance, with bottom boot
|
|
type flash chips the second sector can be used: the offset
|
|
for this sector is given here.
|
|
|
|
CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
|
|
|
|
- CONFIG_ENV_ADDR:
|
|
|
|
This is just another way to specify the start address of
|
|
the flash sector containing the environment (instead of
|
|
CONFIG_ENV_OFFSET).
|
|
|
|
- CONFIG_ENV_SECT_SIZE:
|
|
|
|
Size of the sector containing the environment.
|
|
|
|
|
|
b) Sometimes flash chips have few, equal sized, BIG sectors.
|
|
In such a case you don't want to spend a whole sector for
|
|
the environment.
|
|
|
|
- CONFIG_ENV_SIZE:
|
|
|
|
If you use this in combination with CONFIG_ENV_IS_IN_FLASH
|
|
and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
|
|
of this flash sector for the environment. This saves
|
|
memory for the RAM copy of the environment.
|
|
|
|
It may also save flash memory if you decide to use this
|
|
when your environment is "embedded" within U-Boot code,
|
|
since then the remainder of the flash sector could be used
|
|
for U-Boot code. It should be pointed out that this is
|
|
STRONGLY DISCOURAGED from a robustness point of view:
|
|
updating the environment in flash makes it always
|
|
necessary to erase the WHOLE sector. If something goes
|
|
wrong before the contents has been restored from a copy in
|
|
RAM, your target system will be dead.
|
|
|
|
- CONFIG_ENV_ADDR_REDUND
|
|
CONFIG_ENV_SIZE_REDUND
|
|
|
|
These settings describe a second storage area used to hold
|
|
a redundant copy of the environment data, so that there is
|
|
a valid backup copy in case there is a power failure during
|
|
a "saveenv" operation.
|
|
|
|
BE CAREFUL! Any changes to the flash layout, and some changes to the
|
|
source code will make it necessary to adapt <board>/u-boot.lds*
|
|
accordingly!
|
|
|
|
|
|
- CONFIG_ENV_IS_IN_NVRAM:
|
|
|
|
Define this if you have some non-volatile memory device
|
|
(NVRAM, battery buffered SRAM) which you want to use for the
|
|
environment.
|
|
|
|
- CONFIG_ENV_ADDR:
|
|
- CONFIG_ENV_SIZE:
|
|
|
|
These two #defines are used to determine the memory area you
|
|
want to use for environment. It is assumed that this memory
|
|
can just be read and written to, without any special
|
|
provision.
|
|
|
|
BE CAREFUL! The first access to the environment happens quite early
|
|
in U-Boot initalization (when we try to get the setting of for the
|
|
console baudrate). You *MUST* have mapped your NVRAM area then, or
|
|
U-Boot will hang.
|
|
|
|
Please note that even with NVRAM we still use a copy of the
|
|
environment in RAM: we could work on NVRAM directly, but we want to
|
|
keep settings there always unmodified except somebody uses "saveenv"
|
|
to save the current settings.
|
|
|
|
|
|
- CONFIG_ENV_IS_IN_EEPROM:
|
|
|
|
Use this if you have an EEPROM or similar serial access
|
|
device and a driver for it.
|
|
|
|
- CONFIG_ENV_OFFSET:
|
|
- CONFIG_ENV_SIZE:
|
|
|
|
These two #defines specify the offset and size of the
|
|
environment area within the total memory of your EEPROM.
|
|
|
|
- CONFIG_SYS_I2C_EEPROM_ADDR:
|
|
If defined, specified the chip address of the EEPROM device.
|
|
The default address is zero.
|
|
|
|
- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
|
|
If defined, the number of bits used to address bytes in a
|
|
single page in the EEPROM device. A 64 byte page, for example
|
|
would require six bits.
|
|
|
|
- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
|
|
If defined, the number of milliseconds to delay between
|
|
page writes. The default is zero milliseconds.
|
|
|
|
- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
|
|
The length in bytes of the EEPROM memory array address. Note
|
|
that this is NOT the chip address length!
|
|
|
|
- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
|
|
EEPROM chips that implement "address overflow" are ones
|
|
like Catalyst 24WC04/08/16 which has 9/10/11 bits of
|
|
address and the extra bits end up in the "chip address" bit
|
|
slots. This makes a 24WC08 (1Kbyte) chip look like four 256
|
|
byte chips.
|
|
|
|
Note that we consider the length of the address field to
|
|
still be one byte because the extra address bits are hidden
|
|
in the chip address.
|
|
|
|
- CONFIG_SYS_EEPROM_SIZE:
|
|
The size in bytes of the EEPROM device.
|
|
|
|
- CONFIG_ENV_EEPROM_IS_ON_I2C
|
|
define this, if you have I2C and SPI activated, and your
|
|
EEPROM, which holds the environment, is on the I2C bus.
|
|
|
|
- CONFIG_I2C_ENV_EEPROM_BUS
|
|
if you have an Environment on an EEPROM reached over
|
|
I2C muxes, you can define here, how to reach this
|
|
EEPROM. For example:
|
|
|
|
#define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0"
|
|
|
|
EEPROM which holds the environment, is reached over
|
|
a pca9547 i2c mux with address 0x70, channel 3.
|
|
|
|
- CONFIG_ENV_IS_IN_DATAFLASH:
|
|
|
|
Define this if you have a DataFlash memory device which you
|
|
want to use for the environment.
|
|
|
|
- CONFIG_ENV_OFFSET:
|
|
- CONFIG_ENV_ADDR:
|
|
- CONFIG_ENV_SIZE:
|
|
|
|
These three #defines specify the offset and size of the
|
|
environment area within the total memory of your DataFlash placed
|
|
at the specified address.
|
|
|
|
- CONFIG_ENV_IS_IN_NAND:
|
|
|
|
Define this if you have a NAND device which you want to use
|
|
for the environment.
|
|
|
|
- CONFIG_ENV_OFFSET:
|
|
- CONFIG_ENV_SIZE:
|
|
|
|
These two #defines specify the offset and size of the environment
|
|
area within the first NAND device. CONFIG_ENV_OFFSET must be
|
|
aligned to an erase block boundary.
|
|
|
|
- CONFIG_ENV_OFFSET_REDUND (optional):
|
|
|
|
This setting describes a second storage area of CONFIG_ENV_SIZE
|
|
size used to hold a redundant copy of the environment data, so
|
|
that there is a valid backup copy in case there is a power failure
|
|
during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
|
|
aligned to an erase block boundary.
|
|
|
|
- CONFIG_ENV_RANGE (optional):
|
|
|
|
Specifies the length of the region in which the environment
|
|
can be written. This should be a multiple of the NAND device's
|
|
block size. Specifying a range with more erase blocks than
|
|
are needed to hold CONFIG_ENV_SIZE allows bad blocks within
|
|
the range to be avoided.
|
|
|
|
- CONFIG_ENV_OFFSET_OOB (optional):
|
|
|
|
Enables support for dynamically retrieving the offset of the
|
|
environment from block zero's out-of-band data. The
|
|
"nand env.oob" command can be used to record this offset.
|
|
Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
|
|
using CONFIG_ENV_OFFSET_OOB.
|
|
|
|
- CONFIG_NAND_ENV_DST
|
|
|
|
Defines address in RAM to which the nand_spl code should copy the
|
|
environment. If redundant environment is used, it will be copied to
|
|
CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
|
|
|
|
- CONFIG_SYS_SPI_INIT_OFFSET
|
|
|
|
Defines offset to the initial SPI buffer area in DPRAM. The
|
|
area is used at an early stage (ROM part) if the environment
|
|
is configured to reside in the SPI EEPROM: We need a 520 byte
|
|
scratch DPRAM area. It is used between the two initialization
|
|
calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
|
|
to be a good choice since it makes it far enough from the
|
|
start of the data area as well as from the stack pointer.
|
|
|
|
Please note that the environment is read-only until the monitor
|
|
has been relocated to RAM and a RAM copy of the environment has been
|
|
created; also, when using EEPROM you will have to use getenv_f()
|
|
until then to read environment variables.
|
|
|
|
The environment is protected by a CRC32 checksum. Before the monitor
|
|
is relocated into RAM, as a result of a bad CRC you will be working
|
|
with the compiled-in default environment - *silently*!!! [This is
|
|
necessary, because the first environment variable we need is the
|
|
"baudrate" setting for the console - if we have a bad CRC, we don't
|
|
have any device yet where we could complain.]
|
|
|
|
Note: once the monitor has been relocated, then it will complain if
|
|
the default environment is used; a new CRC is computed as soon as you
|
|
use the "saveenv" command to store a valid environment.
|
|
|
|
- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
|
|
Echo the inverted Ethernet link state to the fault LED.
|
|
|
|
Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
|
|
also needs to be defined.
|
|
|
|
- CONFIG_SYS_FAULT_MII_ADDR:
|
|
MII address of the PHY to check for the Ethernet link state.
|
|
|
|
- CONFIG_NS16550_MIN_FUNCTIONS:
|
|
Define this if you desire to only have use of the NS16550_init
|
|
and NS16550_putc functions for the serial driver located at
|
|
drivers/serial/ns16550.c. This option is useful for saving
|
|
space for already greatly restricted images, including but not
|
|
limited to NAND_SPL configurations.
|
|
|
|
Low Level (hardware related) configuration options:
|
|
---------------------------------------------------
|
|
|
|
- CONFIG_SYS_CACHELINE_SIZE:
|
|
Cache Line Size of the CPU.
|
|
|
|
- CONFIG_SYS_DEFAULT_IMMR:
|
|
Default address of the IMMR after system reset.
|
|
|
|
Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
|
|
and RPXsuper) to be able to adjust the position of
|
|
the IMMR register after a reset.
|
|
|
|
- CONFIG_SYS_CCSRBAR_DEFAULT:
|
|
Default (power-on reset) physical address of CCSR on Freescale
|
|
PowerPC SOCs.
|
|
|
|
- CONFIG_SYS_CCSRBAR:
|
|
Virtual address of CCSR. On a 32-bit build, this is typically
|
|
the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
|
|
|
|
CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
|
|
for cross-platform code that uses that macro instead.
|
|
|
|
- CONFIG_SYS_CCSRBAR_PHYS:
|
|
Physical address of CCSR. CCSR can be relocated to a new
|
|
physical address, if desired. In this case, this macro should
|
|
be set to that address. Otherwise, it should be set to the
|
|
same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR
|
|
is typically relocated on 36-bit builds. It is recommended
|
|
that this macro be defined via the _HIGH and _LOW macros:
|
|
|
|
#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
|
|
* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
|
|
|
|
- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
|
|
Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically
|
|
either 0 (32-bit build) or 0xF (36-bit build). This macro is
|
|
used in assembly code, so it must not contain typecasts or
|
|
integer size suffixes (e.g. "ULL").
|
|
|
|
- CONFIG_SYS_CCSRBAR_PHYS_LOW:
|
|
Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is
|
|
used in assembly code, so it must not contain typecasts or
|
|
integer size suffixes (e.g. "ULL").
|
|
|
|
- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
|
|
If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
|
|
forced to a value that ensures that CCSR is not relocated.
|
|
|
|
- Floppy Disk Support:
|
|
CONFIG_SYS_FDC_DRIVE_NUMBER
|
|
|
|
the default drive number (default value 0)
|
|
|
|
CONFIG_SYS_ISA_IO_STRIDE
|
|
|
|
defines the spacing between FDC chipset registers
|
|
(default value 1)
|
|
|
|
CONFIG_SYS_ISA_IO_OFFSET
|
|
|
|
defines the offset of register from address. It
|
|
depends on which part of the data bus is connected to
|
|
the FDC chipset. (default value 0)
|
|
|
|
If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
|
|
CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
|
|
default value.
|
|
|
|
if CONFIG_SYS_FDC_HW_INIT is defined, then the function
|
|
fdc_hw_init() is called at the beginning of the FDC
|
|
setup. fdc_hw_init() must be provided by the board
|
|
source code. It is used to make hardware dependant
|
|
initializations.
|
|
|
|
- CONFIG_IDE_AHB:
|
|
Most IDE controllers were designed to be connected with PCI
|
|
interface. Only few of them were designed for AHB interface.
|
|
When software is doing ATA command and data transfer to
|
|
IDE devices through IDE-AHB controller, some additional
|
|
registers accessing to these kind of IDE-AHB controller
|
|
is requierd.
|
|
|
|
- CONFIG_SYS_IMMR: Physical address of the Internal Memory.
|
|
DO NOT CHANGE unless you know exactly what you're
|
|
doing! (11-4) [MPC8xx/82xx systems only]
|
|
|
|
- CONFIG_SYS_INIT_RAM_ADDR:
|
|
|
|
Start address of memory area that can be used for
|
|
initial data and stack; please note that this must be
|
|
writable memory that is working WITHOUT special
|
|
initialization, i. e. you CANNOT use normal RAM which
|
|
will become available only after programming the
|
|
memory controller and running certain initialization
|
|
sequences.
|
|
|
|
U-Boot uses the following memory types:
|
|
- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
|
|
- MPC824X: data cache
|
|
- PPC4xx: data cache
|
|
|
|
- CONFIG_SYS_GBL_DATA_OFFSET:
|
|
|
|
Offset of the initial data structure in the memory
|
|
area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
|
|
CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
|
|
data is located at the end of the available space
|
|
(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
|
|
CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
|
|
below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
|
|
CONFIG_SYS_GBL_DATA_OFFSET) downward.
|
|
|
|
Note:
|
|
On the MPC824X (or other systems that use the data
|
|
cache for initial memory) the address chosen for
|
|
CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
|
|
point to an otherwise UNUSED address space between
|
|
the top of RAM and the start of the PCI space.
|
|
|
|
- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
|
|
|
|
- CONFIG_SYS_SYPCR: System Protection Control (11-9)
|
|
|
|
- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
|
|
|
|
- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
|
|
|
|
- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
|
|
|
|
- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
|
|
|
|
- CONFIG_SYS_OR_TIMING_SDRAM:
|
|
SDRAM timing
|
|
|
|
- CONFIG_SYS_MAMR_PTA:
|
|
periodic timer for refresh
|
|
|
|
- CONFIG_SYS_DER: Debug Event Register (37-47)
|
|
|
|
- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
|
|
CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
|
|
CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
|
|
CONFIG_SYS_BR1_PRELIM:
|
|
Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
|
|
|
|
- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
|
|
CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
|
|
CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
|
|
Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
|
|
|
|
- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
|
|
CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
|
|
Machine Mode Register and Memory Periodic Timer
|
|
Prescaler definitions (SDRAM timing)
|
|
|
|
- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
|
|
enable I2C microcode relocation patch (MPC8xx);
|
|
define relocation offset in DPRAM [DSP2]
|
|
|
|
- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
|
|
enable SMC microcode relocation patch (MPC8xx);
|
|
define relocation offset in DPRAM [SMC1]
|
|
|
|
- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
|
|
enable SPI microcode relocation patch (MPC8xx);
|
|
define relocation offset in DPRAM [SCC4]
|
|
|
|
- CONFIG_SYS_USE_OSCCLK:
|
|
Use OSCM clock mode on MBX8xx board. Be careful,
|
|
wrong setting might damage your board. Read
|
|
doc/README.MBX before setting this variable!
|
|
|
|
- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
|
|
Offset of the bootmode word in DPRAM used by post
|
|
(Power On Self Tests). This definition overrides
|
|
#define'd default value in commproc.h resp.
|
|
cpm_8260.h.
|
|
|
|
- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
|
|
CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
|
|
CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
|
|
CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
|
|
CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
|
|
CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
|
|
CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
|
|
CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
|
|
Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
|
|
|
|
- CONFIG_PCI_DISABLE_PCIE:
|
|
Disable PCI-Express on systems where it is supported but not
|
|
required.
|
|
|
|
- CONFIG_SYS_SRIO:
|
|
Chip has SRIO or not
|
|
|
|
- CONFIG_SRIO1:
|
|
Board has SRIO 1 port available
|
|
|
|
- CONFIG_SRIO2:
|
|
Board has SRIO 2 port available
|
|
|
|
- CONFIG_SYS_SRIOn_MEM_VIRT:
|
|
Virtual Address of SRIO port 'n' memory region
|
|
|
|
- CONFIG_SYS_SRIOn_MEM_PHYS:
|
|
Physical Address of SRIO port 'n' memory region
|
|
|
|
- CONFIG_SYS_SRIOn_MEM_SIZE:
|
|
Size of SRIO port 'n' memory region
|
|
|
|
- CONFIG_SYS_NDFC_16
|
|
Defined to tell the NDFC that the NAND chip is using a
|
|
16 bit bus.
|
|
|
|
- CONFIG_SYS_NDFC_EBC0_CFG
|
|
Sets the EBC0_CFG register for the NDFC. If not defined
|
|
a default value will be used.
|
|
|
|
- CONFIG_SPD_EEPROM
|
|
Get DDR timing information from an I2C EEPROM. Common
|
|
with pluggable memory modules such as SODIMMs
|
|
|
|
SPD_EEPROM_ADDRESS
|
|
I2C address of the SPD EEPROM
|
|
|
|
- CONFIG_SYS_SPD_BUS_NUM
|
|
If SPD EEPROM is on an I2C bus other than the first
|
|
one, specify here. Note that the value must resolve
|
|
to something your driver can deal with.
|
|
|
|
- CONFIG_SYS_DDR_RAW_TIMING
|
|
Get DDR timing information from other than SPD. Common with
|
|
soldered DDR chips onboard without SPD. DDR raw timing
|
|
parameters are extracted from datasheet and hard-coded into
|
|
header files or board specific files.
|
|
|
|
- CONFIG_FSL_DDR_INTERACTIVE
|
|
Enable interactive DDR debugging. See doc/README.fsl-ddr.
|
|
|
|
- CONFIG_SYS_83XX_DDR_USES_CS0
|
|
Only for 83xx systems. If specified, then DDR should
|
|
be configured using CS0 and CS1 instead of CS2 and CS3.
|
|
|
|
- CONFIG_ETHER_ON_FEC[12]
|
|
Define to enable FEC[12] on a 8xx series processor.
|
|
|
|
- CONFIG_FEC[12]_PHY
|
|
Define to the hardcoded PHY address which corresponds
|
|
to the given FEC; i. e.
|
|
#define CONFIG_FEC1_PHY 4
|
|
means that the PHY with address 4 is connected to FEC1
|
|
|
|
When set to -1, means to probe for first available.
|
|
|
|
- CONFIG_FEC[12]_PHY_NORXERR
|
|
The PHY does not have a RXERR line (RMII only).
|
|
(so program the FEC to ignore it).
|
|
|
|
- CONFIG_RMII
|
|
Enable RMII mode for all FECs.
|
|
Note that this is a global option, we can't
|
|
have one FEC in standard MII mode and another in RMII mode.
|
|
|
|
- CONFIG_CRC32_VERIFY
|
|
Add a verify option to the crc32 command.
|
|
The syntax is:
|
|
|
|
=> crc32 -v <address> <count> <crc32>
|
|
|
|
Where address/count indicate a memory area
|
|
and crc32 is the correct crc32 which the
|
|
area should have.
|
|
|
|
- CONFIG_LOOPW
|
|
Add the "loopw" memory command. This only takes effect if
|
|
the memory commands are activated globally (CONFIG_CMD_MEM).
|
|
|
|
- CONFIG_MX_CYCLIC
|
|
Add the "mdc" and "mwc" memory commands. These are cyclic
|
|
"md/mw" commands.
|
|
Examples:
|
|
|
|
=> mdc.b 10 4 500
|
|
This command will print 4 bytes (10,11,12,13) each 500 ms.
|
|
|
|
=> mwc.l 100 12345678 10
|
|
This command will write 12345678 to address 100 all 10 ms.
|
|
|
|
This only takes effect if the memory commands are activated
|
|
globally (CONFIG_CMD_MEM).
|
|
|
|
- CONFIG_SKIP_LOWLEVEL_INIT
|
|
[ARM, NDS32, MIPS only] If this variable is defined, then certain
|
|
low level initializations (like setting up the memory
|
|
controller) are omitted and/or U-Boot does not
|
|
relocate itself into RAM.
|
|
|
|
Normally this variable MUST NOT be defined. The only
|
|
exception is when U-Boot is loaded (to RAM) by some
|
|
other boot loader or by a debugger which performs
|
|
these initializations itself.
|
|
|
|
- CONFIG_SPL_BUILD
|
|
Modifies the behaviour of start.S when compiling a loader
|
|
that is executed before the actual U-Boot. E.g. when
|
|
compiling a NAND SPL.
|
|
|
|
- CONFIG_USE_ARCH_MEMCPY
|
|
CONFIG_USE_ARCH_MEMSET
|
|
If these options are used a optimized version of memcpy/memset will
|
|
be used if available. These functions may be faster under some
|
|
conditions but may increase the binary size.
|
|
|
|
Building the Software:
|
|
======================
|
|
|
|
Building U-Boot has been tested in several native build environments
|
|
and in many different cross environments. Of course we cannot support
|
|
all possibly existing versions of cross development tools in all
|
|
(potentially obsolete) versions. In case of tool chain problems we
|
|
recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
|
|
which is extensively used to build and test U-Boot.
|
|
|
|
If you are not using a native environment, it is assumed that you
|
|
have GNU cross compiling tools available in your path. In this case,
|
|
you must set the environment variable CROSS_COMPILE in your shell.
|
|
Note that no changes to the Makefile or any other source files are
|
|
necessary. For example using the ELDK on a 4xx CPU, please enter:
|
|
|
|
$ CROSS_COMPILE=ppc_4xx-
|
|
$ export CROSS_COMPILE
|
|
|
|
Note: If you wish to generate Windows versions of the utilities in
|
|
the tools directory you can use the MinGW toolchain
|
|
(http://www.mingw.org). Set your HOST tools to the MinGW
|
|
toolchain and execute 'make tools'. For example:
|
|
|
|
$ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
|
|
|
|
Binaries such as tools/mkimage.exe will be created which can
|
|
be executed on computers running Windows.
|
|
|
|
U-Boot is intended to be simple to build. After installing the
|
|
sources you must configure U-Boot for one specific board type. This
|
|
is done by typing:
|
|
|
|
make NAME_config
|
|
|
|
where "NAME_config" is the name of one of the existing configu-
|
|
rations; see the main Makefile for supported names.
|
|
|
|
Note: for some board special configuration names may exist; check if
|
|
additional information is available from the board vendor; for
|
|
instance, the TQM823L systems are available without (standard)
|
|
or with LCD support. You can select such additional "features"
|
|
when choosing the configuration, i. e.
|
|
|
|
make TQM823L_config
|
|
- will configure for a plain TQM823L, i. e. no LCD support
|
|
|
|
make TQM823L_LCD_config
|
|
- will configure for a TQM823L with U-Boot console on LCD
|
|
|
|
etc.
|
|
|
|
|
|
Finally, type "make all", and you should get some working U-Boot
|
|
images ready for download to / installation on your system:
|
|
|
|
- "u-boot.bin" is a raw binary image
|
|
- "u-boot" is an image in ELF binary format
|
|
- "u-boot.srec" is in Motorola S-Record format
|
|
|
|
By default the build is performed locally and the objects are saved
|
|
in the source directory. One of the two methods can be used to change
|
|
this behavior and build U-Boot to some external directory:
|
|
|
|
1. Add O= to the make command line invocations:
|
|
|
|
make O=/tmp/build distclean
|
|
make O=/tmp/build NAME_config
|
|
make O=/tmp/build all
|
|
|
|
2. Set environment variable BUILD_DIR to point to the desired location:
|
|
|
|
export BUILD_DIR=/tmp/build
|
|
make distclean
|
|
make NAME_config
|
|
make all
|
|
|
|
Note that the command line "O=" setting overrides the BUILD_DIR environment
|
|
variable.
|
|
|
|
|
|
Please be aware that the Makefiles assume you are using GNU make, so
|
|
for instance on NetBSD you might need to use "gmake" instead of
|
|
native "make".
|
|
|
|
|
|
If the system board that you have is not listed, then you will need
|
|
to port U-Boot to your hardware platform. To do this, follow these
|
|
steps:
|
|
|
|
1. Add a new configuration option for your board to the toplevel
|
|
"Makefile" and to the "MAKEALL" script, using the existing
|
|
entries as examples. Note that here and at many other places
|
|
boards and other names are listed in alphabetical sort order. Please
|
|
keep this order.
|
|
2. Create a new directory to hold your board specific code. Add any
|
|
files you need. In your board directory, you will need at least
|
|
the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
|
|
3. Create a new configuration file "include/configs/<board>.h" for
|
|
your board
|
|
3. If you're porting U-Boot to a new CPU, then also create a new
|
|
directory to hold your CPU specific code. Add any files you need.
|
|
4. Run "make <board>_config" with your new name.
|
|
5. Type "make", and you should get a working "u-boot.srec" file
|
|
to be installed on your target system.
|
|
6. Debug and solve any problems that might arise.
|
|
[Of course, this last step is much harder than it sounds.]
|
|
|
|
|
|
Testing of U-Boot Modifications, Ports to New Hardware, etc.:
|
|
==============================================================
|
|
|
|
If you have modified U-Boot sources (for instance added a new board
|
|
or support for new devices, a new CPU, etc.) you are expected to
|
|
provide feedback to the other developers. The feedback normally takes
|
|
the form of a "patch", i. e. a context diff against a certain (latest
|
|
official or latest in the git repository) version of U-Boot sources.
|
|
|
|
But before you submit such a patch, please verify that your modifi-
|
|
cation did not break existing code. At least make sure that *ALL* of
|
|
the supported boards compile WITHOUT ANY compiler warnings. To do so,
|
|
just run the "MAKEALL" script, which will configure and build U-Boot
|
|
for ALL supported system. Be warned, this will take a while. You can
|
|
select which (cross) compiler to use by passing a `CROSS_COMPILE'
|
|
environment variable to the script, i. e. to use the ELDK cross tools
|
|
you can type
|
|
|
|
CROSS_COMPILE=ppc_8xx- MAKEALL
|
|
|
|
or to build on a native PowerPC system you can type
|
|
|
|
CROSS_COMPILE=' ' MAKEALL
|
|
|
|
When using the MAKEALL script, the default behaviour is to build
|
|
U-Boot in the source directory. This location can be changed by
|
|
setting the BUILD_DIR environment variable. Also, for each target
|
|
built, the MAKEALL script saves two log files (<target>.ERR and
|
|
<target>.MAKEALL) in the <source dir>/LOG directory. This default
|
|
location can be changed by setting the MAKEALL_LOGDIR environment
|
|
variable. For example:
|
|
|
|
export BUILD_DIR=/tmp/build
|
|
export MAKEALL_LOGDIR=/tmp/log
|
|
CROSS_COMPILE=ppc_8xx- MAKEALL
|
|
|
|
With the above settings build objects are saved in the /tmp/build,
|
|
log files are saved in the /tmp/log and the source tree remains clean
|
|
during the whole build process.
|
|
|
|
|
|
See also "U-Boot Porting Guide" below.
|
|
|
|
|
|
Monitor Commands - Overview:
|
|
============================
|
|
|
|
go - start application at address 'addr'
|
|
run - run commands in an environment variable
|
|
bootm - boot application image from memory
|
|
bootp - boot image via network using BootP/TFTP protocol
|
|
tftpboot- boot image via network using TFTP protocol
|
|
and env variables "ipaddr" and "serverip"
|
|
(and eventually "gatewayip")
|
|
tftpput - upload a file via network using TFTP protocol
|
|
rarpboot- boot image via network using RARP/TFTP protocol
|
|
diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
|
|
loads - load S-Record file over serial line
|
|
loadb - load binary file over serial line (kermit mode)
|
|
md - memory display
|
|
mm - memory modify (auto-incrementing)
|
|
nm - memory modify (constant address)
|
|
mw - memory write (fill)
|
|
cp - memory copy
|
|
cmp - memory compare
|
|
crc32 - checksum calculation
|
|
i2c - I2C sub-system
|
|
sspi - SPI utility commands
|
|
base - print or set address offset
|
|
printenv- print environment variables
|
|
setenv - set environment variables
|
|
saveenv - save environment variables to persistent storage
|
|
protect - enable or disable FLASH write protection
|
|
erase - erase FLASH memory
|
|
flinfo - print FLASH memory information
|
|
bdinfo - print Board Info structure
|
|
iminfo - print header information for application image
|
|
coninfo - print console devices and informations
|
|
ide - IDE sub-system
|
|
loop - infinite loop on address range
|
|
loopw - infinite write loop on address range
|
|
mtest - simple RAM test
|
|
icache - enable or disable instruction cache
|
|
dcache - enable or disable data cache
|
|
reset - Perform RESET of the CPU
|
|
echo - echo args to console
|
|
version - print monitor version
|
|
help - print online help
|
|
? - alias for 'help'
|
|
|
|
|
|
Monitor Commands - Detailed Description:
|
|
========================================
|
|
|
|
TODO.
|
|
|
|
For now: just type "help <command>".
|
|
|
|
|
|
Environment Variables:
|
|
======================
|
|
|
|
U-Boot supports user configuration using Environment Variables which
|
|
can be made persistent by saving to Flash memory.
|
|
|
|
Environment Variables are set using "setenv", printed using
|
|
"printenv", and saved to Flash using "saveenv". Using "setenv"
|
|
without a value can be used to delete a variable from the
|
|
environment. As long as you don't save the environment you are
|
|
working with an in-memory copy. In case the Flash area containing the
|
|
environment is erased by accident, a default environment is provided.
|
|
|
|
Some configuration options can be set using Environment Variables.
|
|
|
|
List of environment variables (most likely not complete):
|
|
|
|
baudrate - see CONFIG_BAUDRATE
|
|
|
|
bootdelay - see CONFIG_BOOTDELAY
|
|
|
|
bootcmd - see CONFIG_BOOTCOMMAND
|
|
|
|
bootargs - Boot arguments when booting an RTOS image
|
|
|
|
bootfile - Name of the image to load with TFTP
|
|
|
|
bootm_low - Memory range available for image processing in the bootm
|
|
command can be restricted. This variable is given as
|
|
a hexadecimal number and defines lowest address allowed
|
|
for use by the bootm command. See also "bootm_size"
|
|
environment variable. Address defined by "bootm_low" is
|
|
also the base of the initial memory mapping for the Linux
|
|
kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
|
|
bootm_mapsize.
|
|
|
|
bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
|
|
This variable is given as a hexadecimal number and it
|
|
defines the size of the memory region starting at base
|
|
address bootm_low that is accessible by the Linux kernel
|
|
during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used
|
|
as the default value if it is defined, and bootm_size is
|
|
used otherwise.
|
|
|
|
bootm_size - Memory range available for image processing in the bootm
|
|
command can be restricted. This variable is given as
|
|
a hexadecimal number and defines the size of the region
|
|
allowed for use by the bootm command. See also "bootm_low"
|
|
environment variable.
|
|
|
|
updatefile - Location of the software update file on a TFTP server, used
|
|
by the automatic software update feature. Please refer to
|
|
documentation in doc/README.update for more details.
|
|
|
|
autoload - if set to "no" (any string beginning with 'n'),
|
|
"bootp" will just load perform a lookup of the
|
|
configuration from the BOOTP server, but not try to
|
|
load any image using TFTP
|
|
|
|
autostart - if set to "yes", an image loaded using the "bootp",
|
|
"rarpboot", "tftpboot" or "diskboot" commands will
|
|
be automatically started (by internally calling
|
|
"bootm")
|
|
|
|
If set to "no", a standalone image passed to the
|
|
"bootm" command will be copied to the load address
|
|
(and eventually uncompressed), but NOT be started.
|
|
This can be used to load and uncompress arbitrary
|
|
data.
|
|
|
|
fdt_high - if set this restricts the maximum address that the
|
|
flattened device tree will be copied into upon boot.
|
|
If this is set to the special value 0xFFFFFFFF then
|
|
the fdt will not be copied at all on boot. For this
|
|
to work it must reside in writable memory, have
|
|
sufficient padding on the end of it for u-boot to
|
|
add the information it needs into it, and the memory
|
|
must be accessible by the kernel.
|
|
|
|
fdtcontroladdr- if set this is the address of the control flattened
|
|
device tree used by U-Boot when CONFIG_OF_CONTROL is
|
|
defined.
|
|
|
|
i2cfast - (PPC405GP|PPC405EP only)
|
|
if set to 'y' configures Linux I2C driver for fast
|
|
mode (400kHZ). This environment variable is used in
|
|
initialization code. So, for changes to be effective
|
|
it must be saved and board must be reset.
|
|
|
|
initrd_high - restrict positioning of initrd images:
|
|
If this variable is not set, initrd images will be
|
|
copied to the highest possible address in RAM; this
|
|
is usually what you want since it allows for
|
|
maximum initrd size. If for some reason you want to
|
|
make sure that the initrd image is loaded below the
|
|
CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
|
|
variable to a value of "no" or "off" or "0".
|
|
Alternatively, you can set it to a maximum upper
|
|
address to use (U-Boot will still check that it
|
|
does not overwrite the U-Boot stack and data).
|
|
|
|
For instance, when you have a system with 16 MB
|
|
RAM, and want to reserve 4 MB from use by Linux,
|
|
you can do this by adding "mem=12M" to the value of
|
|
the "bootargs" variable. However, now you must make
|
|
sure that the initrd image is placed in the first
|
|
12 MB as well - this can be done with
|
|
|
|
setenv initrd_high 00c00000
|
|
|
|
If you set initrd_high to 0xFFFFFFFF, this is an
|
|
indication to U-Boot that all addresses are legal
|
|
for the Linux kernel, including addresses in flash
|
|
memory. In this case U-Boot will NOT COPY the
|
|
ramdisk at all. This may be useful to reduce the
|
|
boot time on your system, but requires that this
|
|
feature is supported by your Linux kernel.
|
|
|
|
ipaddr - IP address; needed for tftpboot command
|
|
|
|
loadaddr - Default load address for commands like "bootp",
|
|
"rarpboot", "tftpboot", "loadb" or "diskboot"
|
|
|
|
loads_echo - see CONFIG_LOADS_ECHO
|
|
|
|
serverip - TFTP server IP address; needed for tftpboot command
|
|
|
|
bootretry - see CONFIG_BOOT_RETRY_TIME
|
|
|
|
bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
|
|
|
|
bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
|
|
|
|
ethprime - controls which interface is used first.
|
|
|
|
ethact - controls which interface is currently active.
|
|
For example you can do the following
|
|
|
|
=> setenv ethact FEC
|
|
=> ping 192.168.0.1 # traffic sent on FEC
|
|
=> setenv ethact SCC
|
|
=> ping 10.0.0.1 # traffic sent on SCC
|
|
|
|
ethrotate - When set to "no" U-Boot does not go through all
|
|
available network interfaces.
|
|
It just stays at the currently selected interface.
|
|
|
|
netretry - When set to "no" each network operation will
|
|
either succeed or fail without retrying.
|
|
When set to "once" the network operation will
|
|
fail when all the available network interfaces
|
|
are tried once without success.
|
|
Useful on scripts which control the retry operation
|
|
themselves.
|
|
|
|
npe_ucode - set load address for the NPE microcode
|
|
|
|
tftpsrcport - If this is set, the value is used for TFTP's
|
|
UDP source port.
|
|
|
|
tftpdstport - If this is set, the value is used for TFTP's UDP
|
|
destination port instead of the Well Know Port 69.
|
|
|
|
tftpblocksize - Block size to use for TFTP transfers; if not set,
|
|
we use the TFTP server's default block size
|
|
|
|
tftptimeout - Retransmission timeout for TFTP packets (in milli-
|
|
seconds, minimum value is 1000 = 1 second). Defines
|
|
when a packet is considered to be lost so it has to
|
|
be retransmitted. The default is 5000 = 5 seconds.
|
|
Lowering this value may make downloads succeed
|
|
faster in networks with high packet loss rates or
|
|
with unreliable TFTP servers.
|
|
|
|
vlan - When set to a value < 4095 the traffic over
|
|
Ethernet is encapsulated/received over 802.1q
|
|
VLAN tagged frames.
|
|
|
|
The following image location variables contain the location of images
|
|
used in booting. The "Image" column gives the role of the image and is
|
|
not an environment variable name. The other columns are environment
|
|
variable names. "File Name" gives the name of the file on a TFTP
|
|
server, "RAM Address" gives the location in RAM the image will be
|
|
loaded to, and "Flash Location" gives the image's address in NOR
|
|
flash or offset in NAND flash.
|
|
|
|
*Note* - these variables don't have to be defined for all boards, some
|
|
boards currenlty use other variables for these purposes, and some
|
|
boards use these variables for other purposes.
|
|
|
|
Image File Name RAM Address Flash Location
|
|
----- --------- ----------- --------------
|
|
u-boot u-boot u-boot_addr_r u-boot_addr
|
|
Linux kernel bootfile kernel_addr_r kernel_addr
|
|
device tree blob fdtfile fdt_addr_r fdt_addr
|
|
ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr
|
|
|
|
The following environment variables may be used and automatically
|
|
updated by the network boot commands ("bootp" and "rarpboot"),
|
|
depending the information provided by your boot server:
|
|
|
|
bootfile - see above
|
|
dnsip - IP address of your Domain Name Server
|
|
dnsip2 - IP address of your secondary Domain Name Server
|
|
gatewayip - IP address of the Gateway (Router) to use
|
|
hostname - Target hostname
|
|
ipaddr - see above
|
|
netmask - Subnet Mask
|
|
rootpath - Pathname of the root filesystem on the NFS server
|
|
serverip - see above
|
|
|
|
|
|
There are two special Environment Variables:
|
|
|
|
serial# - contains hardware identification information such
|
|
as type string and/or serial number
|
|
ethaddr - Ethernet address
|
|
|
|
These variables can be set only once (usually during manufacturing of
|
|
the board). U-Boot refuses to delete or overwrite these variables
|
|
once they have been set once.
|
|
|
|
|
|
Further special Environment Variables:
|
|
|
|
ver - Contains the U-Boot version string as printed
|
|
with the "version" command. This variable is
|
|
readonly (see CONFIG_VERSION_VARIABLE).
|
|
|
|
|
|
Please note that changes to some configuration parameters may take
|
|
only effect after the next boot (yes, that's just like Windoze :-).
|
|
|
|
|
|
Command Line Parsing:
|
|
=====================
|
|
|
|
There are two different command line parsers available with U-Boot:
|
|
the old "simple" one, and the much more powerful "hush" shell:
|
|
|
|
Old, simple command line parser:
|
|
--------------------------------
|
|
|
|
- supports environment variables (through setenv / saveenv commands)
|
|
- several commands on one line, separated by ';'
|
|
- variable substitution using "... ${name} ..." syntax
|
|
- special characters ('$', ';') can be escaped by prefixing with '\',
|
|
for example:
|
|
setenv bootcmd bootm \${address}
|
|
- You can also escape text by enclosing in single apostrophes, for example:
|
|
setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
|
|
|
|
Hush shell:
|
|
-----------
|
|
|
|
- similar to Bourne shell, with control structures like
|
|
if...then...else...fi, for...do...done; while...do...done,
|
|
until...do...done, ...
|
|
- supports environment ("global") variables (through setenv / saveenv
|
|
commands) and local shell variables (through standard shell syntax
|
|
"name=value"); only environment variables can be used with "run"
|
|
command
|
|
|
|
General rules:
|
|
--------------
|
|
|
|
(1) If a command line (or an environment variable executed by a "run"
|
|
command) contains several commands separated by semicolon, and
|
|
one of these commands fails, then the remaining commands will be
|
|
executed anyway.
|
|
|
|
(2) If you execute several variables with one call to run (i. e.
|
|
calling run with a list of variables as arguments), any failing
|
|
command will cause "run" to terminate, i. e. the remaining
|
|
variables are not executed.
|
|
|
|
Note for Redundant Ethernet Interfaces:
|
|
=======================================
|
|
|
|
Some boards come with redundant Ethernet interfaces; U-Boot supports
|
|
such configurations and is capable of automatic selection of a
|
|
"working" interface when needed. MAC assignment works as follows:
|
|
|
|
Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
|
|
MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
|
|
"eth1addr" (=>eth1), "eth2addr", ...
|
|
|
|
If the network interface stores some valid MAC address (for instance
|
|
in SROM), this is used as default address if there is NO correspon-
|
|
ding setting in the environment; if the corresponding environment
|
|
variable is set, this overrides the settings in the card; that means:
|
|
|
|
o If the SROM has a valid MAC address, and there is no address in the
|
|
environment, the SROM's address is used.
|
|
|
|
o If there is no valid address in the SROM, and a definition in the
|
|
environment exists, then the value from the environment variable is
|
|
used.
|
|
|
|
o If both the SROM and the environment contain a MAC address, and
|
|
both addresses are the same, this MAC address is used.
|
|
|
|
o If both the SROM and the environment contain a MAC address, and the
|
|
addresses differ, the value from the environment is used and a
|
|
warning is printed.
|
|
|
|
o If neither SROM nor the environment contain a MAC address, an error
|
|
is raised.
|
|
|
|
If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
|
|
will be programmed into hardware as part of the initialization process. This
|
|
may be skipped by setting the appropriate 'ethmacskip' environment variable.
|
|
The naming convention is as follows:
|
|
"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
|
|
|
|
Image Formats:
|
|
==============
|
|
|
|
U-Boot is capable of booting (and performing other auxiliary operations on)
|
|
images in two formats:
|
|
|
|
New uImage format (FIT)
|
|
-----------------------
|
|
|
|
Flexible and powerful format based on Flattened Image Tree -- FIT (similar
|
|
to Flattened Device Tree). It allows the use of images with multiple
|
|
components (several kernels, ramdisks, etc.), with contents protected by
|
|
SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
|
|
|
|
|
|
Old uImage format
|
|
-----------------
|
|
|
|
Old image format is based on binary files which can be basically anything,
|
|
preceded by a special header; see the definitions in include/image.h for
|
|
details; basically, the header defines the following image properties:
|
|
|
|
* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
|
|
4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
|
|
LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
|
|
Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
|
|
INTEGRITY).
|
|
* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
|
|
IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
|
|
Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
|
|
* Compression Type (uncompressed, gzip, bzip2)
|
|
* Load Address
|
|
* Entry Point
|
|
* Image Name
|
|
* Image Timestamp
|
|
|
|
The header is marked by a special Magic Number, and both the header
|
|
and the data portions of the image are secured against corruption by
|
|
CRC32 checksums.
|
|
|
|
|
|
Linux Support:
|
|
==============
|
|
|
|
Although U-Boot should support any OS or standalone application
|
|
easily, the main focus has always been on Linux during the design of
|
|
U-Boot.
|
|
|
|
U-Boot includes many features that so far have been part of some
|
|
special "boot loader" code within the Linux kernel. Also, any
|
|
"initrd" images to be used are no longer part of one big Linux image;
|
|
instead, kernel and "initrd" are separate images. This implementation
|
|
serves several purposes:
|
|
|
|
- the same features can be used for other OS or standalone
|
|
applications (for instance: using compressed images to reduce the
|
|
Flash memory footprint)
|
|
|
|
- it becomes much easier to port new Linux kernel versions because
|
|
lots of low-level, hardware dependent stuff are done by U-Boot
|
|
|
|
- the same Linux kernel image can now be used with different "initrd"
|
|
images; of course this also means that different kernel images can
|
|
be run with the same "initrd". This makes testing easier (you don't
|
|
have to build a new "zImage.initrd" Linux image when you just
|
|
change a file in your "initrd"). Also, a field-upgrade of the
|
|
software is easier now.
|
|
|
|
|
|
Linux HOWTO:
|
|
============
|
|
|
|
Porting Linux to U-Boot based systems:
|
|
---------------------------------------
|
|
|
|
U-Boot cannot save you from doing all the necessary modifications to
|
|
configure the Linux device drivers for use with your target hardware
|
|
(no, we don't intend to provide a full virtual machine interface to
|
|
Linux :-).
|
|
|
|
But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
|
|
|
|
Just make sure your machine specific header file (for instance
|
|
include/asm-ppc/tqm8xx.h) includes the same definition of the Board
|
|
Information structure as we define in include/asm-<arch>/u-boot.h,
|
|
and make sure that your definition of IMAP_ADDR uses the same value
|
|
as your U-Boot configuration in CONFIG_SYS_IMMR.
|
|
|
|
|
|
Configuring the Linux kernel:
|
|
-----------------------------
|
|
|
|
No specific requirements for U-Boot. Make sure you have some root
|
|
device (initial ramdisk, NFS) for your target system.
|
|
|
|
|
|
Building a Linux Image:
|
|
-----------------------
|
|
|
|
With U-Boot, "normal" build targets like "zImage" or "bzImage" are
|
|
not used. If you use recent kernel source, a new build target
|
|
"uImage" will exist which automatically builds an image usable by
|
|
U-Boot. Most older kernels also have support for a "pImage" target,
|
|
which was introduced for our predecessor project PPCBoot and uses a
|
|
100% compatible format.
|
|
|
|
Example:
|
|
|
|
make TQM850L_config
|
|
make oldconfig
|
|
make dep
|
|
make uImage
|
|
|
|
The "uImage" build target uses a special tool (in 'tools/mkimage') to
|
|
encapsulate a compressed Linux kernel image with header information,
|
|
CRC32 checksum etc. for use with U-Boot. This is what we are doing:
|
|
|
|
* build a standard "vmlinux" kernel image (in ELF binary format):
|
|
|
|
* convert the kernel into a raw binary image:
|
|
|
|
${CROSS_COMPILE}-objcopy -O binary \
|
|
-R .note -R .comment \
|
|
-S vmlinux linux.bin
|
|
|
|
* compress the binary image:
|
|
|
|
gzip -9 linux.bin
|
|
|
|
* package compressed binary image for U-Boot:
|
|
|
|
mkimage -A ppc -O linux -T kernel -C gzip \
|
|
-a 0 -e 0 -n "Linux Kernel Image" \
|
|
-d linux.bin.gz uImage
|
|
|
|
|
|
The "mkimage" tool can also be used to create ramdisk images for use
|
|
with U-Boot, either separated from the Linux kernel image, or
|
|
combined into one file. "mkimage" encapsulates the images with a 64
|
|
byte header containing information about target architecture,
|
|
operating system, image type, compression method, entry points, time
|
|
stamp, CRC32 checksums, etc.
|
|
|
|
"mkimage" can be called in two ways: to verify existing images and
|
|
print the header information, or to build new images.
|
|
|
|
In the first form (with "-l" option) mkimage lists the information
|
|
contained in the header of an existing U-Boot image; this includes
|
|
checksum verification:
|
|
|
|
tools/mkimage -l image
|
|
-l ==> list image header information
|
|
|
|
The second form (with "-d" option) is used to build a U-Boot image
|
|
from a "data file" which is used as image payload:
|
|
|
|
tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
|
|
-n name -d data_file image
|
|
-A ==> set architecture to 'arch'
|
|
-O ==> set operating system to 'os'
|
|
-T ==> set image type to 'type'
|
|
-C ==> set compression type 'comp'
|
|
-a ==> set load address to 'addr' (hex)
|
|
-e ==> set entry point to 'ep' (hex)
|
|
-n ==> set image name to 'name'
|
|
-d ==> use image data from 'datafile'
|
|
|
|
Right now, all Linux kernels for PowerPC systems use the same load
|
|
address (0x00000000), but the entry point address depends on the
|
|
kernel version:
|
|
|
|
- 2.2.x kernels have the entry point at 0x0000000C,
|
|
- 2.3.x and later kernels have the entry point at 0x00000000.
|
|
|
|
So a typical call to build a U-Boot image would read:
|
|
|
|
-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
|
|
> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
|
|
> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
|
|
> examples/uImage.TQM850L
|
|
Image Name: 2.4.4 kernel for TQM850L
|
|
Created: Wed Jul 19 02:34:59 2000
|
|
Image Type: PowerPC Linux Kernel Image (gzip compressed)
|
|
Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
|
|
Load Address: 0x00000000
|
|
Entry Point: 0x00000000
|
|
|
|
To verify the contents of the image (or check for corruption):
|
|
|
|
-> tools/mkimage -l examples/uImage.TQM850L
|
|
Image Name: 2.4.4 kernel for TQM850L
|
|
Created: Wed Jul 19 02:34:59 2000
|
|
Image Type: PowerPC Linux Kernel Image (gzip compressed)
|
|
Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
|
|
Load Address: 0x00000000
|
|
Entry Point: 0x00000000
|
|
|
|
NOTE: for embedded systems where boot time is critical you can trade
|
|
speed for memory and install an UNCOMPRESSED image instead: this
|
|
needs more space in Flash, but boots much faster since it does not
|
|
need to be uncompressed:
|
|
|
|
-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
|
|
-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
|
|
> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
|
|
> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
|
|
> examples/uImage.TQM850L-uncompressed
|
|
Image Name: 2.4.4 kernel for TQM850L
|
|
Created: Wed Jul 19 02:34:59 2000
|
|
Image Type: PowerPC Linux Kernel Image (uncompressed)
|
|
Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
|
|
Load Address: 0x00000000
|
|
Entry Point: 0x00000000
|
|
|
|
|
|
Similar you can build U-Boot images from a 'ramdisk.image.gz' file
|
|
when your kernel is intended to use an initial ramdisk:
|
|
|
|
-> tools/mkimage -n 'Simple Ramdisk Image' \
|
|
> -A ppc -O linux -T ramdisk -C gzip \
|
|
> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
|
|
Image Name: Simple Ramdisk Image
|
|
Created: Wed Jan 12 14:01:50 2000
|
|
Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
|
|
Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
|
|
Load Address: 0x00000000
|
|
Entry Point: 0x00000000
|
|
|
|
|
|
Installing a Linux Image:
|
|
-------------------------
|
|
|
|
To downloading a U-Boot image over the serial (console) interface,
|
|
you must convert the image to S-Record format:
|
|
|
|
objcopy -I binary -O srec examples/image examples/image.srec
|
|
|
|
The 'objcopy' does not understand the information in the U-Boot
|
|
image header, so the resulting S-Record file will be relative to
|
|
address 0x00000000. To load it to a given address, you need to
|
|
specify the target address as 'offset' parameter with the 'loads'
|
|
command.
|
|
|
|
Example: install the image to address 0x40100000 (which on the
|
|
TQM8xxL is in the first Flash bank):
|
|
|
|
=> erase 40100000 401FFFFF
|
|
|
|
.......... done
|
|
Erased 8 sectors
|
|
|
|
=> loads 40100000
|
|
## Ready for S-Record download ...
|
|
~>examples/image.srec
|
|
1 2 3 4 5 6 7 8 9 10 11 12 13 ...
|
|
...
|
|
15989 15990 15991 15992
|
|
[file transfer complete]
|
|
[connected]
|
|
## Start Addr = 0x00000000
|
|
|
|
|
|
You can check the success of the download using the 'iminfo' command;
|
|
this includes a checksum verification so you can be sure no data
|
|
corruption happened:
|
|
|
|
=> imi 40100000
|
|
|
|
## Checking Image at 40100000 ...
|
|
Image Name: 2.2.13 for initrd on TQM850L
|
|
Image Type: PowerPC Linux Kernel Image (gzip compressed)
|
|
Data Size: 335725 Bytes = 327 kB = 0 MB
|
|
Load Address: 00000000
|
|
Entry Point: 0000000c
|
|
Verifying Checksum ... OK
|
|
|
|
|
|
Boot Linux:
|
|
-----------
|
|
|
|
The "bootm" command is used to boot an application that is stored in
|
|
memory (RAM or Flash). In case of a Linux kernel image, the contents
|
|
of the "bootargs" environment variable is passed to the kernel as
|
|
parameters. You can check and modify this variable using the
|
|
"printenv" and "setenv" commands:
|
|
|
|
|
|
=> printenv bootargs
|
|
bootargs=root=/dev/ram
|
|
|
|
=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
|
|
|
|
=> printenv bootargs
|
|
bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
|
|
|
|
=> bootm 40020000
|
|
## Booting Linux kernel at 40020000 ...
|
|
Image Name: 2.2.13 for NFS on TQM850L
|
|
Image Type: PowerPC Linux Kernel Image (gzip compressed)
|
|
Data Size: 381681 Bytes = 372 kB = 0 MB
|
|
Load Address: 00000000
|
|
Entry Point: 0000000c
|
|
Verifying Checksum ... OK
|
|
Uncompressing Kernel Image ... OK
|
|
Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
|
|
Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
|
|
time_init: decrementer frequency = 187500000/60
|
|
Calibrating delay loop... 49.77 BogoMIPS
|
|
Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
|
|
...
|
|
|
|
If you want to boot a Linux kernel with initial RAM disk, you pass
|
|
the memory addresses of both the kernel and the initrd image (PPBCOOT
|
|
format!) to the "bootm" command:
|
|
|
|
=> imi 40100000 40200000
|
|
|
|
## Checking Image at 40100000 ...
|
|
Image Name: 2.2.13 for initrd on TQM850L
|
|
Image Type: PowerPC Linux Kernel Image (gzip compressed)
|
|
Data Size: 335725 Bytes = 327 kB = 0 MB
|
|
Load Address: 00000000
|
|
Entry Point: 0000000c
|
|
Verifying Checksum ... OK
|
|
|
|
## Checking Image at 40200000 ...
|
|
Image Name: Simple Ramdisk Image
|
|
Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
|
|
Data Size: 566530 Bytes = 553 kB = 0 MB
|
|
Load Address: 00000000
|
|
Entry Point: 00000000
|
|
Verifying Checksum ... OK
|
|
|
|
=> bootm 40100000 40200000
|
|
## Booting Linux kernel at 40100000 ...
|
|
Image Name: 2.2.13 for initrd on TQM850L
|
|
Image Type: PowerPC Linux Kernel Image (gzip compressed)
|
|
Data Size: 335725 Bytes = 327 kB = 0 MB
|
|
Load Address: 00000000
|
|
Entry Point: 0000000c
|
|
Verifying Checksum ... OK
|
|
Uncompressing Kernel Image ... OK
|
|
## Loading RAMDisk Image at 40200000 ...
|
|
Image Name: Simple Ramdisk Image
|
|
Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
|
|
Data Size: 566530 Bytes = 553 kB = 0 MB
|
|
Load Address: 00000000
|
|
Entry Point: 00000000
|
|
Verifying Checksum ... OK
|
|
Loading Ramdisk ... OK
|
|
Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
|
|
Boot arguments: root=/dev/ram
|
|
time_init: decrementer frequency = 187500000/60
|
|
Calibrating delay loop... 49.77 BogoMIPS
|
|
...
|
|
RAMDISK: Compressed image found at block 0
|
|
VFS: Mounted root (ext2 filesystem).
|
|
|
|
bash#
|
|
|
|
Boot Linux and pass a flat device tree:
|
|
-----------
|
|
|
|
First, U-Boot must be compiled with the appropriate defines. See the section
|
|
titled "Linux Kernel Interface" above for a more in depth explanation. The
|
|
following is an example of how to start a kernel and pass an updated
|
|
flat device tree:
|
|
|
|
=> print oftaddr
|
|
oftaddr=0x300000
|
|
=> print oft
|
|
oft=oftrees/mpc8540ads.dtb
|
|
=> tftp $oftaddr $oft
|
|
Speed: 1000, full duplex
|
|
Using TSEC0 device
|
|
TFTP from server 192.168.1.1; our IP address is 192.168.1.101
|
|
Filename 'oftrees/mpc8540ads.dtb'.
|
|
Load address: 0x300000
|
|
Loading: #
|
|
done
|
|
Bytes transferred = 4106 (100a hex)
|
|
=> tftp $loadaddr $bootfile
|
|
Speed: 1000, full duplex
|
|
Using TSEC0 device
|
|
TFTP from server 192.168.1.1; our IP address is 192.168.1.2
|
|
Filename 'uImage'.
|
|
Load address: 0x200000
|
|
Loading:############
|
|
done
|
|
Bytes transferred = 1029407 (fb51f hex)
|
|
=> print loadaddr
|
|
loadaddr=200000
|
|
=> print oftaddr
|
|
oftaddr=0x300000
|
|
=> bootm $loadaddr - $oftaddr
|
|
## Booting image at 00200000 ...
|
|
Image Name: Linux-2.6.17-dirty
|
|
Image Type: PowerPC Linux Kernel Image (gzip compressed)
|
|
Data Size: 1029343 Bytes = 1005.2 kB
|
|
Load Address: 00000000
|
|
Entry Point: 00000000
|
|
Verifying Checksum ... OK
|
|
Uncompressing Kernel Image ... OK
|
|
Booting using flat device tree at 0x300000
|
|
Using MPC85xx ADS machine description
|
|
Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
|
|
[snip]
|
|
|
|
|
|
More About U-Boot Image Types:
|
|
------------------------------
|
|
|
|
U-Boot supports the following image types:
|
|
|
|
"Standalone Programs" are directly runnable in the environment
|
|
provided by U-Boot; it is expected that (if they behave
|
|
well) you can continue to work in U-Boot after return from
|
|
the Standalone Program.
|
|
"OS Kernel Images" are usually images of some Embedded OS which
|
|
will take over control completely. Usually these programs
|
|
will install their own set of exception handlers, device
|
|
drivers, set up the MMU, etc. - this means, that you cannot
|
|
expect to re-enter U-Boot except by resetting the CPU.
|
|
"RAMDisk Images" are more or less just data blocks, and their
|
|
parameters (address, size) are passed to an OS kernel that is
|
|
being started.
|
|
"Multi-File Images" contain several images, typically an OS
|
|
(Linux) kernel image and one or more data images like
|
|
RAMDisks. This construct is useful for instance when you want
|
|
to boot over the network using BOOTP etc., where the boot
|
|
server provides just a single image file, but you want to get
|
|
for instance an OS kernel and a RAMDisk image.
|
|
|
|
"Multi-File Images" start with a list of image sizes, each
|
|
image size (in bytes) specified by an "uint32_t" in network
|
|
byte order. This list is terminated by an "(uint32_t)0".
|
|
Immediately after the terminating 0 follow the images, one by
|
|
one, all aligned on "uint32_t" boundaries (size rounded up to
|
|
a multiple of 4 bytes).
|
|
|
|
"Firmware Images" are binary images containing firmware (like
|
|
U-Boot or FPGA images) which usually will be programmed to
|
|
flash memory.
|
|
|
|
"Script files" are command sequences that will be executed by
|
|
U-Boot's command interpreter; this feature is especially
|
|
useful when you configure U-Boot to use a real shell (hush)
|
|
as command interpreter.
|
|
|
|
|
|
Standalone HOWTO:
|
|
=================
|
|
|
|
One of the features of U-Boot is that you can dynamically load and
|
|
run "standalone" applications, which can use some resources of
|
|
U-Boot like console I/O functions or interrupt services.
|
|
|
|
Two simple examples are included with the sources:
|
|
|
|
"Hello World" Demo:
|
|
-------------------
|
|
|
|
'examples/hello_world.c' contains a small "Hello World" Demo
|
|
application; it is automatically compiled when you build U-Boot.
|
|
It's configured to run at address 0x00040004, so you can play with it
|
|
like that:
|
|
|
|
=> loads
|
|
## Ready for S-Record download ...
|
|
~>examples/hello_world.srec
|
|
1 2 3 4 5 6 7 8 9 10 11 ...
|
|
[file transfer complete]
|
|
[connected]
|
|
## Start Addr = 0x00040004
|
|
|
|
=> go 40004 Hello World! This is a test.
|
|
## Starting application at 0x00040004 ...
|
|
Hello World
|
|
argc = 7
|
|
argv[0] = "40004"
|
|
argv[1] = "Hello"
|
|
argv[2] = "World!"
|
|
argv[3] = "This"
|
|
argv[4] = "is"
|
|
argv[5] = "a"
|
|
argv[6] = "test."
|
|
argv[7] = "<NULL>"
|
|
Hit any key to exit ...
|
|
|
|
## Application terminated, rc = 0x0
|
|
|
|
Another example, which demonstrates how to register a CPM interrupt
|
|
handler with the U-Boot code, can be found in 'examples/timer.c'.
|
|
Here, a CPM timer is set up to generate an interrupt every second.
|
|
The interrupt service routine is trivial, just printing a '.'
|
|
character, but this is just a demo program. The application can be
|
|
controlled by the following keys:
|
|
|
|
? - print current values og the CPM Timer registers
|
|
b - enable interrupts and start timer
|
|
e - stop timer and disable interrupts
|
|
q - quit application
|
|
|
|
=> loads
|
|
## Ready for S-Record download ...
|
|
~>examples/timer.srec
|
|
1 2 3 4 5 6 7 8 9 10 11 ...
|
|
[file transfer complete]
|
|
[connected]
|
|
## Start Addr = 0x00040004
|
|
|
|
=> go 40004
|
|
## Starting application at 0x00040004 ...
|
|
TIMERS=0xfff00980
|
|
Using timer 1
|
|
tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
|
|
|
|
Hit 'b':
|
|
[q, b, e, ?] Set interval 1000000 us
|
|
Enabling timer
|
|
Hit '?':
|
|
[q, b, e, ?] ........
|
|
tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
|
|
Hit '?':
|
|
[q, b, e, ?] .
|
|
tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
|
|
Hit '?':
|
|
[q, b, e, ?] .
|
|
tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
|
|
Hit '?':
|
|
[q, b, e, ?] .
|
|
tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
|
|
Hit 'e':
|
|
[q, b, e, ?] ...Stopping timer
|
|
Hit 'q':
|
|
[q, b, e, ?] ## Application terminated, rc = 0x0
|
|
|
|
|
|
Minicom warning:
|
|
================
|
|
|
|
Over time, many people have reported problems when trying to use the
|
|
"minicom" terminal emulation program for serial download. I (wd)
|
|
consider minicom to be broken, and recommend not to use it. Under
|
|
Unix, I recommend to use C-Kermit for general purpose use (and
|
|
especially for kermit binary protocol download ("loadb" command), and
|
|
use "cu" for S-Record download ("loads" command).
|
|
|
|
Nevertheless, if you absolutely want to use it try adding this
|
|
configuration to your "File transfer protocols" section:
|
|
|
|
Name Program Name U/D FullScr IO-Red. Multi
|
|
X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
|
|
Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
|
|
|
|
|
|
NetBSD Notes:
|
|
=============
|
|
|
|
Starting at version 0.9.2, U-Boot supports NetBSD both as host
|
|
(build U-Boot) and target system (boots NetBSD/mpc8xx).
|
|
|
|
Building requires a cross environment; it is known to work on
|
|
NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
|
|
need gmake since the Makefiles are not compatible with BSD make).
|
|
Note that the cross-powerpc package does not install include files;
|
|
attempting to build U-Boot will fail because <machine/ansi.h> is
|
|
missing. This file has to be installed and patched manually:
|
|
|
|
# cd /usr/pkg/cross/powerpc-netbsd/include
|
|
# mkdir powerpc
|
|
# ln -s powerpc machine
|
|
# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
|
|
# ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
|
|
|
|
Native builds *don't* work due to incompatibilities between native
|
|
and U-Boot include files.
|
|
|
|
Booting assumes that (the first part of) the image booted is a
|
|
stage-2 loader which in turn loads and then invokes the kernel
|
|
proper. Loader sources will eventually appear in the NetBSD source
|
|
tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
|
|
meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
|
|
|
|
|
|
Implementation Internals:
|
|
=========================
|
|
|
|
The following is not intended to be a complete description of every
|
|
implementation detail. However, it should help to understand the
|
|
inner workings of U-Boot and make it easier to port it to custom
|
|
hardware.
|
|
|
|
|
|
Initial Stack, Global Data:
|
|
---------------------------
|
|
|
|
The implementation of U-Boot is complicated by the fact that U-Boot
|
|
starts running out of ROM (flash memory), usually without access to
|
|
system RAM (because the memory controller is not initialized yet).
|
|
This means that we don't have writable Data or BSS segments, and BSS
|
|
is not initialized as zero. To be able to get a C environment working
|
|
at all, we have to allocate at least a minimal stack. Implementation
|
|
options for this are defined and restricted by the CPU used: Some CPU
|
|
models provide on-chip memory (like the IMMR area on MPC8xx and
|
|
MPC826x processors), on others (parts of) the data cache can be
|
|
locked as (mis-) used as memory, etc.
|
|
|
|
Chris Hallinan posted a good summary of these issues to the
|
|
U-Boot mailing list:
|
|
|
|
Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
|
|
From: "Chris Hallinan" <clh@net1plus.com>
|
|
Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
|
|
...
|
|
|
|
Correct me if I'm wrong, folks, but the way I understand it
|
|
is this: Using DCACHE as initial RAM for Stack, etc, does not
|
|
require any physical RAM backing up the cache. The cleverness
|
|
is that the cache is being used as a temporary supply of
|
|
necessary storage before the SDRAM controller is setup. It's
|
|
beyond the scope of this list to explain the details, but you
|
|
can see how this works by studying the cache architecture and
|
|
operation in the architecture and processor-specific manuals.
|
|
|
|
OCM is On Chip Memory, which I believe the 405GP has 4K. It
|
|
is another option for the system designer to use as an
|
|
initial stack/RAM area prior to SDRAM being available. Either
|
|
option should work for you. Using CS 4 should be fine if your
|
|
board designers haven't used it for something that would
|
|
cause you grief during the initial boot! It is frequently not
|
|
used.
|
|
|
|
CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
|
|
with your processor/board/system design. The default value
|
|
you will find in any recent u-boot distribution in
|
|
walnut.h should work for you. I'd set it to a value larger
|
|
than your SDRAM module. If you have a 64MB SDRAM module, set
|
|
it above 400_0000. Just make sure your board has no resources
|
|
that are supposed to respond to that address! That code in
|
|
start.S has been around a while and should work as is when
|
|
you get the config right.
|
|
|
|
-Chris Hallinan
|
|
DS4.COM, Inc.
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It is essential to remember this, since it has some impact on the C
|
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code for the initialization procedures:
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* Initialized global data (data segment) is read-only. Do not attempt
|
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to write it.
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* Do not use any uninitialized global data (or implicitely initialized
|
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as zero data - BSS segment) at all - this is undefined, initiali-
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zation is performed later (when relocating to RAM).
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* Stack space is very limited. Avoid big data buffers or things like
|
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that.
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Having only the stack as writable memory limits means we cannot use
|
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normal global data to share information beween the code. But it
|
|
turned out that the implementation of U-Boot can be greatly
|
|
simplified by making a global data structure (gd_t) available to all
|
|
functions. We could pass a pointer to this data as argument to _all_
|
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functions, but this would bloat the code. Instead we use a feature of
|
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the GCC compiler (Global Register Variables) to share the data: we
|
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place a pointer (gd) to the global data into a register which we
|
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reserve for this purpose.
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When choosing a register for such a purpose we are restricted by the
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relevant (E)ABI specifications for the current architecture, and by
|
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GCC's implementation.
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For PowerPC, the following registers have specific use:
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R1: stack pointer
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R2: reserved for system use
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R3-R4: parameter passing and return values
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R5-R10: parameter passing
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R13: small data area pointer
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R30: GOT pointer
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R31: frame pointer
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(U-Boot also uses R12 as internal GOT pointer. r12
|
|
is a volatile register so r12 needs to be reset when
|
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going back and forth between asm and C)
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==> U-Boot will use R2 to hold a pointer to the global data
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Note: on PPC, we could use a static initializer (since the
|
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address of the global data structure is known at compile time),
|
|
but it turned out that reserving a register results in somewhat
|
|
smaller code - although the code savings are not that big (on
|
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average for all boards 752 bytes for the whole U-Boot image,
|
|
624 text + 127 data).
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|
|
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On Blackfin, the normal C ABI (except for P3) is followed as documented here:
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http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
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==> U-Boot will use P3 to hold a pointer to the global data
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On ARM, the following registers are used:
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R0: function argument word/integer result
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R1-R3: function argument word
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R9: GOT pointer
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R10: stack limit (used only if stack checking if enabled)
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R11: argument (frame) pointer
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R12: temporary workspace
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R13: stack pointer
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R14: link register
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R15: program counter
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==> U-Boot will use R8 to hold a pointer to the global data
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On Nios II, the ABI is documented here:
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http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
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==> U-Boot will use gp to hold a pointer to the global data
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Note: on Nios II, we give "-G0" option to gcc and don't use gp
|
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to access small data sections, so gp is free.
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On NDS32, the following registers are used:
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R0-R1: argument/return
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R2-R5: argument
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R15: temporary register for assembler
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R16: trampoline register
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R28: frame pointer (FP)
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R29: global pointer (GP)
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R30: link register (LP)
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R31: stack pointer (SP)
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PC: program counter (PC)
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==> U-Boot will use R10 to hold a pointer to the global data
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NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
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or current versions of GCC may "optimize" the code too much.
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Memory Management:
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------------------
|
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U-Boot runs in system state and uses physical addresses, i.e. the
|
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MMU is not used either for address mapping nor for memory protection.
|
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|
|
The available memory is mapped to fixed addresses using the memory
|
|
controller. In this process, a contiguous block is formed for each
|
|
memory type (Flash, SDRAM, SRAM), even when it consists of several
|
|
physical memory banks.
|
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|
|
U-Boot is installed in the first 128 kB of the first Flash bank (on
|
|
TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
|
|
booting and sizing and initializing DRAM, the code relocates itself
|
|
to the upper end of DRAM. Immediately below the U-Boot code some
|
|
memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
|
|
configuration setting]. Below that, a structure with global Board
|
|
Info data is placed, followed by the stack (growing downward).
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|
|
Additionally, some exception handler code is copied to the low 8 kB
|
|
of DRAM (0x00000000 ... 0x00001FFF).
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|
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So a typical memory configuration with 16 MB of DRAM could look like
|
|
this:
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0x0000 0000 Exception Vector code
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:
|
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0x0000 1FFF
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0x0000 2000 Free for Application Use
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:
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:
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:
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:
|
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0x00FB FF20 Monitor Stack (Growing downward)
|
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0x00FB FFAC Board Info Data and permanent copy of global data
|
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0x00FC 0000 Malloc Arena
|
|
:
|
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0x00FD FFFF
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0x00FE 0000 RAM Copy of Monitor Code
|
|
... eventually: LCD or video framebuffer
|
|
... eventually: pRAM (Protected RAM - unchanged by reset)
|
|
0x00FF FFFF [End of RAM]
|
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|
|
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|
System Initialization:
|
|
----------------------
|
|
|
|
In the reset configuration, U-Boot starts at the reset entry point
|
|
(on most PowerPC systems at address 0x00000100). Because of the reset
|
|
configuration for CS0# this is a mirror of the onboard Flash memory.
|
|
To be able to re-map memory U-Boot then jumps to its link address.
|
|
To be able to implement the initialization code in C, a (small!)
|
|
initial stack is set up in the internal Dual Ported RAM (in case CPUs
|
|
which provide such a feature like MPC8xx or MPC8260), or in a locked
|
|
part of the data cache. After that, U-Boot initializes the CPU core,
|
|
the caches and the SIU.
|
|
|
|
Next, all (potentially) available memory banks are mapped using a
|
|
preliminary mapping. For example, we put them on 512 MB boundaries
|
|
(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
|
|
on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
|
|
programmed for SDRAM access. Using the temporary configuration, a
|
|
simple memory test is run that determines the size of the SDRAM
|
|
banks.
|
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|
|
When there is more than one SDRAM bank, and the banks are of
|
|
different size, the largest is mapped first. For equal size, the first
|
|
bank (CS2#) is mapped first. The first mapping is always for address
|
|
0x00000000, with any additional banks following immediately to create
|
|
contiguous memory starting from 0.
|
|
|
|
Then, the monitor installs itself at the upper end of the SDRAM area
|
|
and allocates memory for use by malloc() and for the global Board
|
|
Info data; also, the exception vector code is copied to the low RAM
|
|
pages, and the final stack is set up.
|
|
|
|
Only after this relocation will you have a "normal" C environment;
|
|
until that you are restricted in several ways, mostly because you are
|
|
running from ROM, and because the code will have to be relocated to a
|
|
new address in RAM.
|
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|
|
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|
U-Boot Porting Guide:
|
|
----------------------
|
|
|
|
[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
|
|
list, October 2002]
|
|
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
sighandler_t no_more_time;
|
|
|
|
signal(SIGALRM, no_more_time);
|
|
alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
|
|
|
|
if (available_money > available_manpower) {
|
|
Pay consultant to port U-Boot;
|
|
return 0;
|
|
}
|
|
|
|
Download latest U-Boot source;
|
|
|
|
Subscribe to u-boot mailing list;
|
|
|
|
if (clueless)
|
|
email("Hi, I am new to U-Boot, how do I get started?");
|
|
|
|
while (learning) {
|
|
Read the README file in the top level directory;
|
|
Read http://www.denx.de/twiki/bin/view/DULG/Manual;
|
|
Read applicable doc/*.README;
|
|
Read the source, Luke;
|
|
/* find . -name "*.[chS]" | xargs grep -i <keyword> */
|
|
}
|
|
|
|
if (available_money > toLocalCurrency ($2500))
|
|
Buy a BDI3000;
|
|
else
|
|
Add a lot of aggravation and time;
|
|
|
|
if (a similar board exists) { /* hopefully... */
|
|
cp -a board/<similar> board/<myboard>
|
|
cp include/configs/<similar>.h include/configs/<myboard>.h
|
|
} else {
|
|
Create your own board support subdirectory;
|
|
Create your own board include/configs/<myboard>.h file;
|
|
}
|
|
Edit new board/<myboard> files
|
|
Edit new include/configs/<myboard>.h
|
|
|
|
while (!accepted) {
|
|
while (!running) {
|
|
do {
|
|
Add / modify source code;
|
|
} until (compiles);
|
|
Debug;
|
|
if (clueless)
|
|
email("Hi, I am having problems...");
|
|
}
|
|
Send patch file to the U-Boot email list;
|
|
if (reasonable critiques)
|
|
Incorporate improvements from email list code review;
|
|
else
|
|
Defend code as written;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void no_more_time (int sig)
|
|
{
|
|
hire_a_guru();
|
|
}
|
|
|
|
|
|
Coding Standards:
|
|
-----------------
|
|
|
|
All contributions to U-Boot should conform to the Linux kernel
|
|
coding style; see the file "Documentation/CodingStyle" and the script
|
|
"scripts/Lindent" in your Linux kernel source directory.
|
|
|
|
Source files originating from a different project (for example the
|
|
MTD subsystem) are generally exempt from these guidelines and are not
|
|
reformated to ease subsequent migration to newer versions of those
|
|
sources.
|
|
|
|
Please note that U-Boot is implemented in C (and to some small parts in
|
|
Assembler); no C++ is used, so please do not use C++ style comments (//)
|
|
in your code.
|
|
|
|
Please also stick to the following formatting rules:
|
|
- remove any trailing white space
|
|
- use TAB characters for indentation and vertical alignment, not spaces
|
|
- make sure NOT to use DOS '\r\n' line feeds
|
|
- do not add more than 2 consecutive empty lines to source files
|
|
- do not add trailing empty lines to source files
|
|
|
|
Submissions which do not conform to the standards may be returned
|
|
with a request to reformat the changes.
|
|
|
|
|
|
Submitting Patches:
|
|
-------------------
|
|
|
|
Since the number of patches for U-Boot is growing, we need to
|
|
establish some rules. Submissions which do not conform to these rules
|
|
may be rejected, even when they contain important and valuable stuff.
|
|
|
|
Please see http://www.denx.de/wiki/U-Boot/Patches for details.
|
|
|
|
Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
|
|
see http://lists.denx.de/mailman/listinfo/u-boot
|
|
|
|
When you send a patch, please include the following information with
|
|
it:
|
|
|
|
* For bug fixes: a description of the bug and how your patch fixes
|
|
this bug. Please try to include a way of demonstrating that the
|
|
patch actually fixes something.
|
|
|
|
* For new features: a description of the feature and your
|
|
implementation.
|
|
|
|
* A CHANGELOG entry as plaintext (separate from the patch)
|
|
|
|
* For major contributions, your entry to the CREDITS file
|
|
|
|
* When you add support for a new board, don't forget to add this
|
|
board to the MAINTAINERS file, too.
|
|
|
|
* If your patch adds new configuration options, don't forget to
|
|
document these in the README file.
|
|
|
|
* The patch itself. If you are using git (which is *strongly*
|
|
recommended) you can easily generate the patch using the
|
|
"git format-patch". If you then use "git send-email" to send it to
|
|
the U-Boot mailing list, you will avoid most of the common problems
|
|
with some other mail clients.
|
|
|
|
If you cannot use git, use "diff -purN OLD NEW". If your version of
|
|
diff does not support these options, then get the latest version of
|
|
GNU diff.
|
|
|
|
The current directory when running this command shall be the parent
|
|
directory of the U-Boot source tree (i. e. please make sure that
|
|
your patch includes sufficient directory information for the
|
|
affected files).
|
|
|
|
We prefer patches as plain text. MIME attachments are discouraged,
|
|
and compressed attachments must not be used.
|
|
|
|
* If one logical set of modifications affects or creates several
|
|
files, all these changes shall be submitted in a SINGLE patch file.
|
|
|
|
* Changesets that contain different, unrelated modifications shall be
|
|
submitted as SEPARATE patches, one patch per changeset.
|
|
|
|
|
|
Notes:
|
|
|
|
* Before sending the patch, run the MAKEALL script on your patched
|
|
source tree and make sure that no errors or warnings are reported
|
|
for any of the boards.
|
|
|
|
* Keep your modifications to the necessary minimum: A patch
|
|
containing several unrelated changes or arbitrary reformats will be
|
|
returned with a request to re-formatting / split it.
|
|
|
|
* If you modify existing code, make sure that your new code does not
|
|
add to the memory footprint of the code ;-) Small is beautiful!
|
|
When adding new features, these should compile conditionally only
|
|
(using #ifdef), and the resulting code with the new feature
|
|
disabled must not need more memory than the old code without your
|
|
modification.
|
|
|
|
* Remember that there is a size limit of 100 kB per message on the
|
|
u-boot mailing list. Bigger patches will be moderated. If they are
|
|
reasonable and not too big, they will be acknowledged. But patches
|
|
bigger than the size limit should be avoided.
|