[coreboot] Question on VGA BIOS extraction
tpearson at raptorengineeringinc.com
Mon Mar 30 18:29:01 CEST 2015
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.
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