[LinuxBIOS] VGA (Tyan s2881)

Hidasi Jozsef hidi at e-tiger.net
Fri May 12 22:49:40 CEST 2006

Try to dump it from the original BIOS use AMITOOL or whatever BIOS
s2881 uses... s2882 uses AMI ;( sorry for it...

Friday, May 12, 2006, 10:36:41 PM, you wrote:

> It should be 36k...

> YH

> -----Original Message-----
> From: linuxbios-bounces at linuxbios.org
> [mailto:linuxbios-bounces at linuxbios.org] On Behalf Of Ward Vandewege
> Sent: Friday, May 12, 2006 1:19 PM
> To: linuxbios at linuxbios.org
> Subject: [LinuxBIOS] VGA (Tyan s2881)

> (forgot attachment, sorry)

> Hi all,

> I'm trying to get VGA working on the Tyan s2881. 

> I've extracted a 32KB VGA rom image while running under the proprietary
> It looks all right: it starts with 55 AA, has ATI strings in it, and it
> stops
> just before the next option rom starts with 55 AA.

> I've enabled

>   #VGA Console
>   default CONFIG_CONSOLE_VGA=1
>   default CONFIG_PCI_ROM_RUN=1

> in src/mainboard/tyan/s2881/Options.lb

> I've modified the ROM_SIZE in targets/tyan/s2881/Config.lb:

>   option ROM_SIZE = 491520

> I've appended the linuxbios rom to the vgabios, and burned that image.

> It boots fine, but no VGA output.

> I've verified the contents of the video memory after booting:

>   dd if=/dev/mem of=vga.bios bs=1 count=32768 skip=786432

> The memory area is identical to the vga bios image I extracted.

> I've attached the boot log. It sees the VGA device, and it says it
> copies the
> ROM image to 0xc0000, all 0x8000 bytes of it.

> I wonder about this halt_sys line:

> ...
> copying VGA ROM Image from 0xfff80000 to 0xc0000, 0x8000 bytes
> entering emulator
> halt_sys: file
> /personal/projects/gnu/chimera/linuxbios/lbv2/rev-latest/LinuxBIOSv2/src
> /devices/emulator/x86emu/ops.c,
>   line 4387
> PCI: 01:04.0 init
> ...

> I feel like I'm missing something pretty obvious here. Suggestions?

> I also wonder why it's _always_ booting the fallback image. I have the
> same
> payload for primary and fallback for now. Is this because there is
> 'dirty'
> CMOS data?

> Thanks,
> Ward.

> -- 
> Ward Vandewege <ward at fsf.org>
> Free Software Foundation - Senior System Administrator

Best regards,
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