On Tue, 22 Feb 2000, Chong Chee Yong wrote:
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.
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