Messages in this thread | | | Date | Wed, 2 Sep 1998 18:56:06 +0200 (CEST) | From | Gerd Knorr <> | Subject | Re: Next round of console patches |
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On Wed, 2 Sep 1998, Vojtech Pavlik wrote:
> On Wed, Sep 02, 1998 at 08:20:32AM +0200, Gerd Knorr wrote: > > > 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. ^^^^^^^^ Could you explain this? My dictionary has'nt conputer-speak translation for this...
Does it really mean the video memory and mmio overlap? Or is this some larger area (say 16 MB space) for graphics I/O with the framebuffer (say 4 MB) at the start and 1k MMIO at the end and some unused space inbetween?
Gerd
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