[coreboot] Question on VGA BIOS extraction
wangfei.jimei at gmail.com
Tue Mar 31 00:33:03 CEST 2015
TP X220 suppose to have a UEFI compatible BIOS, is it possible it has a
UEFI DXE VGA driver (not sure what's the proper name of it) except a legacy
Maybe you should boot up system with original BIOS and check the content in
0xC000 segment, is it a legacy VBIOS or it's empty...
On Mon, Mar 30, 2015 at 7:10 PM, Charles Devereaux <coreboot at guylhem.net>
> Likewise on thinkpad tablets the name of the digitizer (WACF004) can be
> changed by the ACPI DSDT depending on things detected by the BIOS or not.
> You may want to check the DSDT
> On Mon, Mar 30, 2015 at 12:29 PM, Timothy Pearson <
> tpearson at raptorengineeringinc.com> wrote:
>> On 03/30/2015 11:24 AM, Iru Cai wrote:
>>> I'm trying to build Coreboot for ThinkPad X220. I first backup the
>>> vendor BIOS, then use UEFITool to extract a VBIOS. The romheader program
>>> detects the ROM's PCI data structure and reports the device id is
>>> 8086:0106, but the VGA controller's device id is 8086:0126. I extracted
>>> the video ROM from a running X220 memory and use romheader to test it,
>>> the result is still 8086:0106. How could this happen?
>> Some PCI devices can change their device ID based on a configuration
>> register or two (I know the XGI Volari can do this for instance). It is
>> possible that the proprietary BIOS changes the ID for some reason.
>> Timothy Pearson
>> Raptor Engineering
>> +1 (415) 727-8645
>> coreboot mailing list: coreboot at coreboot.org
> coreboot mailing list: coreboot at coreboot.org
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