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Re: [Xen-devel] [PATCH(es)] graphics passthrough with VT-d

To: alan@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] [PATCH(es)] graphics passthrough with VT-d
From: "Mr. Teo En Ming (Zhang Enming)" <enming.teo@xxxxxxxxxxxxxxx>
Date: Sat, 29 Aug 2009 00:39:15 +0800
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, timothy.moore@xxxxxxxxxxx
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Dear Alan,

When I extracted the vga bios for my nvidia geforce 8400 gs, i went into BIOS to set PEG as the primary video adapter. Then I booted using nvidia gfx and extracted the vga bios using nvflash.exe.

I believe it is possible to use a hex editor to examine the vga firmware file to see if it's the vga bios for nvidia.

Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering) 
BEng(Hons)(Mechanical Engineering)
Technical Support Engineer
Information Technology Department
Asiasoft Online Pte Ltd
Tampines Central 1 #04-01 Tampines Plaza
Singapore 529541
Republic of Singapore
Mobile: +65-9648-9798
MSN: teoenming@xxxxxxxxxxx
Alma Maters: Singapore Polytechnic, National University of Singapore

On 08/29/2009 12:36 AM, Alan Cox wrote:
I believe the VGA BIOS in the physical memory region 0xC0000 to 0xC7FFF
is the vga bios of onboard Intel graphics, and not my Geforce 8400 GS.
If that was your boot video device. To extract the video BIOS for the
Nvidia you either need to map it and read it out or boot with the Nvidia
as the boot video device to acquire it and then switch back. That ought
to work.


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