so, i gather that this dedicated pci bus connects to the graphics
chipset.
and since it appears as another pci device, it must implement the pci configuration space, and thus it has an expansion ROM base address register which we can determine if a BIOS exist or not. If it has one, then it is likely that the initialization of the graphics chip is done by the this BIOS instead of the system BIOS.
Unfortunately it may not be that simple on motherboards with integrated graphics. There is only one NVRAM chip. This NVRAM is owned by the PIIX4E bridge. I am not sure how they would do the expansion ROM base address for the AGP stuff.
But it is certainly worth a look.
If there is only one NVRAM the Video BIOS must be included in the system BIOS.
Maybe you can do the following: - start with your original BIOS - copy the Video BIOS to a file (it starts at 0xC0000) - include the file into your BIOS - move the Video BIOS to 0xC0000 - start it
I think that should work.
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