> There is. The VESA BIOS will tell you (a) how much video memory the board
> has installed and (b) where the linear framebuffer starts. vesafb (well,
> the real mode boot code) asks the BIOS for these values and uses this for
> the framebuffer device. And for exactly this area the mtrr entry is added.
>
> Assuming legal framebuffer space and MMIO don't overlap, this works fine.
As far as I know, this assumption is not true at least for Mach64 based VGA
cards - they map their MMIO over the last kilobyte of video RAM in the
aperture.
Vojtech Pavlik
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