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

Andriy Gapon avg at icyb.net.ua
Thu Oct 30 15:43:21 CET 2008

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

More information about the coreboot mailing list