[coreboot] coreboot.v2+seabios on 440bx: option roms not found

[Andriy Gapon]

on 30/10/2008 16:34 Myles Watson said the following:
> 
>> -----Original Message-----
>> From: coreboot-bounces at coreboot.org [mailto:coreboot-bounces at coreboot.org]
>> On Behalf Of Andriy Gapon
>> Sent: Thursday, October 30, 2008 8:25 AM
>> To: Coreboot
>> Subject: [coreboot] coreboot.v2+seabios on 440bx: option roms not found
>>
>>
>> In northbridge/intel/i440bx/raminit.c:sdram_set_spd_registers all PAM
>> registers are programmed for RAM R/W access (0x33).
>> When SeaBIOS searches for option ROMs (including VGA ROM) it doesn't do
>> anything about PAM, so it sees empty memory instead of the ROMs.
>>
>> I am not sure what is the best solution here. It is debatable how
>> coreboot should set PAM register, and it is not right to make SeaBIOS
>> too hardware dependent.
>>
>> Maybe coreboot could somehow export functions for setting access to
>> option ROM space (aka legacy memory segments) and SeaBIOS could call them.
>>
> 
> I think SeaBIOS expects Coreboot to copy the option ROM to 0xc0000 in RAM.
> That way SeaBIOS gets to stay hardware agnostic.
> 

Makes sense!
But it doesn't look like this does actually happen (by default).
I am playing with msi/ms6147 target (under heavily tweaked qemu).


-- 
Andriy Gapon