u-boot-brain

brain-hackers_pepepper-mirror/u-boot-brain

mirror of https://github.com/brain-hackers/u-boot-brain synced 2024-07-05 02:36:39 +09:00

History

Paul Gortmaker ecdc3df611 sbc8641d: increase monitor size from 256k to 384k Between v2015.07-rc1 and v2015.07-rc2 this board started silent boot failure. A bisect led to commit `6eed3786c6` ("net: Move the CMD_NET config to defconfigs"). This commit looks harmless in itself, but it did implicitly add a feature to the image which led to this: u-boot$git describe `6eed3786c6` v2015.07-rc1-412-g6eed3786c68c ^^^ u-boot$ls -l ../41/u-boot.bin -rwxrwxr-x 1 paul paul 261476 Oct 16 16:47 ../411/u-boot.bin -rwxrwxr-x 1 paul paul 266392 Oct 16 16:43 ../412/u-boot.bin u-boot$bc bc 1.06.95 Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. 2561024 262144 i.e. we finally broke through the 256k monitor size. Jump it up to 384k and fix the hard coded value used in the env offset at the same time. We were probably flirting with the 256k size issue without knowing it when testing on different baselines in earlier commits, but since this is all board specific, a rebase or reorder to put this commit 1st is of little value. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>		2015-10-19 17:06:19 -04:00
..
ddr.c	Driver/DDR: Moving Freescale DDR driver to a common driver	2013-11-25 11:43:43 -08:00
Kconfig	kconfig: remove redundant "string" type in arch and board Kconfigs	2014-09-13 16:43:55 -04:00
law.c	Add GPL-2.0+ SPDX-License-Identifier to source files	2013-07-24 09:44:38 -04:00
MAINTAINERS	Add board MAINTAINERS files	2014-07-30 08:48:06 -04:00
Makefile	Driver/DDR: Moving Freescale DDR driver to a common driver	2013-11-25 11:43:43 -08:00
README	sbc8641d: increase monitor size from 256k to 384k	2015-10-19 17:06:19 -04:00
sbc8641d.c	fdt: Allow ft_board_setup() to report failure	2014-11-21 04:43:15 +01:00

README

Wind River SBC8641D reference board
===========================

Created 06/14/2007 Joe Hamman
Copyright 2007, Embedded Specialties, Inc.
Copyright 2007 Wind River Systems, Inc.
-----------------------------

1. Building U-Boot
------------------
The SBC8641D code is known to build using ELDK 4.1.

    $ make sbc8641d_config
    Configuring for sbc8641d board...

    $ make


2. Switch and Jumper Settings
-----------------------------
All Jumpers & Switches are in their default positions.  Please refer to
the board documentation for details.  Some settings control CPU voltages
and settings may change with board revisions.

3. Known limitations
--------------------
PCI:
	The PCI command may hang if no boards are present in either slot.

4. Reflashing U-Boot
--------------------
The board has two independent flash devices which can be used for dual
booting, or for u-boot backup and recovery.  A two pin jumper on the
three pin JP10 determines which device is attached to /CS0 line.

Assuming one device has a functional u-boot, and the other device has
a recently installed non-functional image, to perform a recovery from
that non-functional image goes essentially as follows:

a) power down the board and jumper JP10 to select the functional image.
b) power on the board and let it get to u-boot prompt.
c) while on, using static precautions, move JP10 back to the failed image.
d) use "md fff00000" to confirm you are looking at the failed image
e) turn off write protect with "prot off all"
f) get new image, i.e. "tftp 200000 /somepath/u-boot.bin"
g) erase failed image: "erase FFF00000 FFF5FFFF"
h) copy in new image: "cp.b 200000 FFF00000 60000"
i) ensure new image is written: "md fff00000"
k) power cycle the board and confirm new image works.