mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 00:47:26 +00:00
235 lines
6.6 KiB
Text
235 lines
6.6 KiB
Text
|
|
SSV ADNP/ESC1 Embedded Softcore Computing
|
|
Nios Softcore, Altera Cyclone FPGA
|
|
|
|
Last Update: February 27, 2004
|
|
====================================================================
|
|
|
|
This file contains information regarding U-Boot and the SSV Embedded
|
|
Nios Softcore Computing platform ADNP/ESC1. For general Nios
|
|
information see doc/README.nios.
|
|
|
|
Most stuff of this file was borrowed and based on README.dk1s10,
|
|
the Altera DK-1S10 related information file.
|
|
|
|
For those interested in contributing ... see HELP WANTED section
|
|
in doc/README.nios.
|
|
|
|
Contents:
|
|
|
|
1. Files
|
|
2. Memory Organization
|
|
3. CPU Variations
|
|
4. Examples
|
|
5. Programming U-Boot into FLASH with GERMS
|
|
6. Autoboot
|
|
7. U-Boot environment convention and update philosophy
|
|
|
|
====================================================================
|
|
|
|
1. Files
|
|
=========
|
|
board/ssv/adnpesc1/*
|
|
include/configs/ADNPESC1.h
|
|
include/configs/ADNPESC1_base_32.h
|
|
|
|
|
|
2. Memory Organization
|
|
=======================
|
|
|
|
For the most part, you can put things pretty much anywhere.
|
|
This is pretty flexible for Nios. So here we make some arbitrary
|
|
choices & assume that the monitor is placed at the end of a memory
|
|
resource. So you must make sure TEXT_BASE is chosen appropriately.
|
|
This is very important if you plan to move your memory to another
|
|
place as configured at this time!
|
|
|
|
-The heap is placed below the monitor (U-Boot code).
|
|
-Global data is placed below the heap.
|
|
-The stack is placed below global data (&grows down).
|
|
|
|
(see doc/README.adnpesc1_base32 too)
|
|
|
|
|
|
3. CPU Variations
|
|
=================
|
|
|
|
There are more than one NIOS CPU variation for the ADNP/ESC1 possible.
|
|
U-Boot supports the following CPU configurations:
|
|
|
|
- SSV Basis 32 (make ADNPESC1_base_32_config)
|
|
- SSV Basis 32 at DNP evaluation base board 2
|
|
(make ADNPESC1_DNPEVA2_base_32_config)
|
|
|
|
|
|
4. Examples
|
|
============
|
|
|
|
The hello_world example works fine. To try out you have to change
|
|
the default load address from 0x0100_0000 to 0x0204_0000 in
|
|
examples/Makefile (the real SDRAM for default board configuration).
|
|
|
|
|
|
5. Programming U-Boot into FLASH with GERMS
|
|
============================================
|
|
|
|
The current version of the ADNP/ESC1 port with the default
|
|
configuration settings occupies about 97 KBytes of flash.
|
|
A minimal configuration occupies less than 70 KByte
|
|
(network, SPI, POST and board command support disabled). You
|
|
can save more memory by deactivating the Hu-Shell support and
|
|
long command help (CFG_HUSH_PARSER, CFG_LONGHELP).
|
|
|
|
To program U-Boot into the ADNP/ESC1 flash using GERMS do the
|
|
following:
|
|
|
|
1. Download U-Boot to its target run space in SDRAM:
|
|
|
|
a. Close jumper RCM_EN# and push the reset button.
|
|
|
|
b. From the command line, download U-Boot using the
|
|
nios-run:
|
|
|
|
$ nios-run -r u-boot.srec
|
|
|
|
NOTE: In some cases this want fail. I don't know why,
|
|
but try again.
|
|
|
|
This takes about 1 minute (GERMS is not very speedy here).
|
|
After u-boot is downloaded it will be executed. You should
|
|
see the following:
|
|
|
|
U-Boot 1.0.2 (Jan 30 2004 - 12:59:15)
|
|
|
|
CPU: Nios-32 Rev. 3.3 (0x3038)
|
|
Reg file size: 512 LO_LIMIT/HI_LIMIT: 1/30
|
|
Board: SSV DilNetPC ADNP/ESC1
|
|
Conf.: SSV Base 32 (nios_32)
|
|
In: serial
|
|
Out: serial
|
|
Err: serial
|
|
ADNPESC1 >
|
|
|
|
|
|
2. Quit nios-run and start your terminal application (e.g. start
|
|
Hyperterminal or minicom).
|
|
|
|
3. Download the u-boot code to RAM. When using Hyperterminal, do the
|
|
following:
|
|
|
|
a. From the u-boot command prompt start a binary download to SDRAM:
|
|
|
|
at the SSV Basis 32 to SDRAM:
|
|
|
|
==> loadb 2000100
|
|
|
|
b. Download u-boot.bin using kermit.
|
|
|
|
4. From the U-Boot command prompt, erase flash:
|
|
|
|
at the SSV Basis 32 from 0x1000000 to 0x103ffff:
|
|
|
|
==> protect off 1:0-3
|
|
==> erase 1:0-3
|
|
|
|
5. Copy the binary image from SDRAM to flash:
|
|
|
|
at the SSV Basis 32 from SDRAM:
|
|
|
|
==> cp.b 2000100 1000000 $filesize
|
|
|
|
U-Boot will now automatically start when the board is powered on or
|
|
reset using the SSV Basis 32 configuration without closed RCM jumper.
|
|
To start U-Boot with closed RCM Jumper, enter the following GERMS
|
|
command:
|
|
|
|
+ g 1000000
|
|
|
|
|
|
6. Autoboot
|
|
===========
|
|
|
|
U-Boot will try to boot a valid Nios application from Flash. For this
|
|
it will use the deposited Hu-Shell script in environment variable
|
|
'bootcmd' which is looking for a valid Nios application identifier
|
|
string in Flash and go on at even its entry address. For more
|
|
information see the next chapter.
|
|
|
|
|
|
7. U-Boot environment convention and update philosophy
|
|
======================================================
|
|
|
|
U-Boot for the SSV ADNP/ESC1 target knows about many environment
|
|
variables used to control the startup process, update process for
|
|
raw Nios applications, and optionally file system image updates.
|
|
In default configuration there are two Hu-Shell scripts to update
|
|
the Nios application and/or the file system image:
|
|
|
|
1. Update Nios application (ex. the uCLinux kernel):
|
|
|
|
run 'appl_update'
|
|
|
|
2. Update optional file system image (ex. RomFS image used by uCLinux):
|
|
|
|
run 'fs_update'
|
|
|
|
The Nios application can be any programm code generated in relation
|
|
to the Nios application identifier -- the string "Nios" at offset
|
|
address 0x0c. To use the scripts like described above in a secure way
|
|
you have to check-up the next environment variables:
|
|
|
|
1. update_allowed
|
|
|
|
- Update switch -- must be set to '1' (one) to allow any update
|
|
- default is '0' (zero)
|
|
|
|
NOTE: You should avoid to save this variable with non zero
|
|
value to Flash. Otherwise it would be allow any
|
|
update process at any time!
|
|
|
|
2. appl_entry_addr
|
|
|
|
- Nios application area start address (usually in Flash)
|
|
- this is the startup address for autoboot
|
|
- each Nios application code we want to update will be copied
|
|
to this address
|
|
- default is CFG_ADNPESC1_NIOS_APPL_ENTRY
|
|
|
|
3. appl_end_addr
|
|
|
|
- Nios application area end address (usually in Flash)
|
|
- will be used to unprotect/erase the Flash area while updating
|
|
- default is CFG_ADNPESC1_NIOS_APPL_END
|
|
|
|
4. appl_ident_addr
|
|
|
|
- address of the Nios application identification string
|
|
- this is the address checked-up by autoboot
|
|
- default is CFG_ADNPESC1_NIOS_APPL_IDENT
|
|
|
|
5. appl_ident_str
|
|
|
|
- the Nios application identification string itself
|
|
- default is CFG_ADNPESC1_NIOS_IDENTIFIER
|
|
|
|
6. appl_name
|
|
|
|
- name of file we have to download/update
|
|
- default is ADNPESC1/base32/linux.bin
|
|
|
|
7. fs_base_addr
|
|
|
|
- optionally file system area start address (usually in Flash)
|
|
- each file system we want to update will be copied to this address
|
|
- default is CFG_ADNPESC1_FILESYSTEM_BASE
|
|
|
|
8. fs_end_addr
|
|
|
|
- optionally file system area end address (usually in Flash)
|
|
- will be used to unprotect/erase the Flash area while updating
|
|
- default is CFG_ADNPESC1_FILESYSTEM_END
|
|
|
|
9. fs_name
|
|
|
|
- name of file we have to download/update
|
|
- default is ADNPESC1/base32/romfs.img
|