mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-12 22:33:18 +00:00
9b7993bba9
These board has not been converted to CONFIG_DM_PCI by the deadline. Remove them. As this is the last of the mcf547x_8x family of boards, remove that support as well. Cc: TsiChung Liew <Tsi-Chung.Liew@nxp.com> Signed-off-by: Tom Rini <trini@konsulko.com>
170 lines
5.2 KiB
ReStructuredText
170 lines
5.2 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
|
|
|
|
M68K / ColdFire
|
|
===============
|
|
|
|
History
|
|
-------
|
|
* November 02, 2017 Angelo Dureghello <angelo@sysam.it>
|
|
* August 08, 2005 Jens Scharsig <esw@bus-elektronik.de>
|
|
MCF5282 implementation without preloader
|
|
* January 12, 2004 <josef.baumgartner@telex.de>
|
|
|
|
This file contains status information for the port of U-Boot to the
|
|
Motorola ColdFire series of CPUs.
|
|
|
|
Overview
|
|
--------
|
|
|
|
The ColdFire instruction set is "assembly source" compatible but an evolution
|
|
of the original 68000 instruction set. Some not much used instructions has
|
|
been removed. The instructions are only 16, 32, or 48 bits long, a
|
|
simplification compared to the 68000 series.
|
|
|
|
Bernhard Kuhn ported U-Boot 0.4.0 to the Motorola ColdFire architecture.
|
|
The patches of Bernhard support the MCF5272 and MCF5282. A great disadvantage
|
|
of these patches was that they needed a pre-bootloader to start U-Boot.
|
|
Because of this, a new port was created which no longer needs a first stage
|
|
booter.
|
|
|
|
Thanks mainly to Freescale but also to several other contributors, U-Boot now
|
|
supports nearly the entire range of ColdFire processors and their related
|
|
development boards.
|
|
|
|
|
|
Supported CPU families
|
|
----------------------
|
|
|
|
Please "make menuconfig" and select "m68k" or check arch/m68k/cpu to see the
|
|
currently supported processor and families.
|
|
|
|
|
|
Supported boards
|
|
----------------
|
|
|
|
U-Boot supports actually more than 40 ColdFire based boards.
|
|
Board configuration can be done trough include/configs/<boardname>.h but the
|
|
current recommended method is to use the new and more friendly approach as
|
|
the "make menuconfig" way, very similar to the Linux way.
|
|
|
|
To know details as memory map, build targets, default setup, etc, of a
|
|
specific board please check:
|
|
|
|
* include/configs/<boardname>.h
|
|
|
|
and/or
|
|
|
|
* configs/<boardname>_defconfig
|
|
|
|
It is possible to build all ColdFire boards in a single command-line command,
|
|
from u-boot root directory, as::
|
|
|
|
./tools/buildman/buildman m68k
|
|
|
|
Build U-Boot for a specific board
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
A bash script similar to the one below may be used:
|
|
|
|
.. code-block:: shell
|
|
|
|
#!/bin/bash
|
|
|
|
export CROSS_COMPILE=/opt/toolchains/m68k/gcc-4.9.0-nolibc/bin/m68k-linux-
|
|
|
|
board=M5249EVB
|
|
|
|
make distclean
|
|
make ${board}_defconfig
|
|
make KBUILD_VERBOSE=1
|
|
|
|
|
|
Adopted toolchains
|
|
------------------
|
|
|
|
Please check:
|
|
https://www.denx.de/wiki/U-Boot/ColdFireNotes
|
|
|
|
|
|
ColdFire specific configuration options/settings
|
|
------------------------------------------------
|
|
|
|
Configuration to use a pre-loader
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
If U-Boot should be loaded to RAM and started by a pre-loader
|
|
CONFIG_MONITOR_IS_IN_RAM must be defined. If it is defined the
|
|
initial vector table and basic processor initialization will not
|
|
be compiled in. The start address of U-Boot must be adjusted in
|
|
the boards config header file (CONFIG_SYS_MONITOR_BASE) and Makefile
|
|
(CONFIG_SYS_TEXT_BASE) to the load address.
|
|
|
|
ColdFire CPU specific options/settings
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
To specify a CPU model, some defines shoudl be used, i.e.:
|
|
|
|
CONFIG_MCF52x2:
|
|
defined for all MCF52x2 CPUs
|
|
CONFIG_M5272:
|
|
defined for all Motorola MCF5272 CPUs
|
|
|
|
Other options, generally set inside include/configs/<boardname>.h, they may
|
|
apply to one or more cpu for the ColdFire family:
|
|
|
|
CONFIG_SYS_MBAR:
|
|
defines the base address of the MCF5272 configuration registers
|
|
CONFIG_SYS_ENET_BD_BASE:
|
|
defines the base address of the FEC buffer descriptors
|
|
CONFIG_SYS_SCR:
|
|
defines the contents of the System Configuration Register
|
|
CONFIG_SYS_SPR:
|
|
defines the contents of the System Protection Register
|
|
CONFIG_SYS_MFD:
|
|
defines the PLL Multiplication Factor Divider
|
|
(see table 9-4 of MCF user manual)
|
|
CONFIG_SYS_RFD:
|
|
defines the PLL Reduce Frequency Devider
|
|
(see table 9-4 of MCF user manual)
|
|
CONFIG_SYS_CSx_BASE:
|
|
defines the base address of chip select x
|
|
CONFIG_SYS_CSx_SIZE:
|
|
defines the memory size (address range) of chip select x
|
|
CONFIG_SYS_CSx_WIDTH:
|
|
defines the bus with of chip select x
|
|
CONFIG_SYS_CSx_MASK:
|
|
defines the mask for the related chip select x
|
|
CONFIG_SYS_CSx_RO:
|
|
if set to 0 chip select x is read/write else chip select is read only
|
|
CONFIG_SYS_CSx_WS:
|
|
defines the number of wait states of chip select x
|
|
CONFIG_SYS_CACHE_ICACR:
|
|
cache-related registers config
|
|
CONFIG_SYS_CACHE_DCACR:
|
|
cache-related registers config
|
|
CONFIG_SYS_CACHE_ACRX:
|
|
cache-related registers config
|
|
CONFIG_SYS_SDRAM_BASE:
|
|
SDRAM config for SDRAM controller-specific registers
|
|
CONFIG_SYS_SDRAM_SIZE:
|
|
SDRAM config for SDRAM controller-specific registers
|
|
CONFIG_SYS_SDRAM_BASEX:
|
|
SDRAM config for SDRAM controller-specific registers
|
|
CONFIG_SYS_SDRAM_CFG1:
|
|
SDRAM config for SDRAM controller-specific registers
|
|
CONFIG_SYS_SDRAM_CFG2:
|
|
SDRAM config for SDRAM controller-specific registers
|
|
CONFIG_SYS_SDRAM_CTRL:
|
|
SDRAM config for SDRAM controller-specific registers
|
|
CONFIG_SYS_SDRAM_MODE:
|
|
SDRAM config for SDRAM controller-specific registers
|
|
CONFIG_SYS_SDRAM_EMOD:
|
|
SDRAM config for SDRAM controller-specific registers, please
|
|
see arch/m68k/cpu/<specific_cpu>/start.S files to see how
|
|
these options are used.
|
|
CONFIG_MCFUART:
|
|
defines enabling of ColdFire UART driver
|
|
CONFIG_SYS_UART_PORT:
|
|
defines the UART port to be used (only a single UART can be actually enabled)
|
|
CONFIG_SYS_SBFHDR_SIZE:
|
|
size of the prepended SBF header, if any
|