[coreboot] [PATCH] Add support for Asus M4A785-M, with build instructions
Juhana Helovuo
juhe at iki.fi
Thu Sep 9 18:12:55 CEST 2010
On Sat, 2010-09-04 at 15:23 -0600, Myles Watson wrote:
> It would be a lot easier to review if you split the patch into smaller pieces.
>
> 1. Use svn cp to copy the tilapia board directory for your board
> 2. Make the changes so it works for your board (just copy the files
> you already have from another location)
> 3. svn diff
>
> This will produce a patch with only your changes.
>
> Split out work-around patches as well. Something is broken for your
> board, and that needs to be fixed, but I don't think we should change
> the PCI scan code.
Ok, this makes sense. The previous patch I sent was unnecessarily large.
There are now three smaller patches attached:
(1) Changes specific to this board. Fairly small changes from AMD
Tilapia. Requires (2) to work.
(2) Small, hopefully non-intrusive, patches to generic code that are
required to prevent hangups/crashes on this board.
(3) Multiboot table patch required to get UMA and high coreboot tables
locations to Grub and Linux. Independent of (1) and (2).
Signed-off-by: Juhana Helovuo <juhe at iki.fi>
I tested appying these patches, building and flashing using the
following procedure:
1. Check out Coreboot from SVN
% svn co svn://coreboot.org/coreboot/trunk coreboot
* The revision used here was 5792.
2. chdir to coreboot
3. svn cp src/mainboard/amd/tilapia_fam10 src/mainboard/asus/m4a785-m
4. patch
% patch -p1 < ../patches/asus-m4a785m-small-patch.patch
% patch -p1 < ../patches/multiboot-table-after-cb-table-r5756-v2.patch
% patch -p1 < ../patches/generic-code-patches-for-m4a785m.patch
5. make menuconfig
* Select mainboard vendor & model
* ROM chip size 1 MByte
* Select: Use VGA console once initialized
* Select Use onboard VGA as primary video device
* Add payload (grub2 and coreinfo tested to work)
* Add VGA BIOS:
The BIOS for the on-board ATI Radeon HD 4200 can be extracted with dd
from /dev/mem as shown in http://www.coreboot.org/VGA_support . The
bios_extract utility can extract some other option ROMs, but it crashes
before it gets the VGA ROM.
* If on-board VGA BIOS is added, set VGA device PCI IDs to "1002,9710"
6. make
* The result should be a working coreboot.rom.
This procedure worked for me. Can someone acknowledge that the patches
do not break anything?
The changes required in generic code are a bit ugly, but I am not
familiar enough with Coreboot to figure out any neater solution.
Best regards,
Juhana Helovuo
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