Re: Next round of console patches

Gerd Knorr (kraxel@goldbach.isdn.cs.tu-berlin.de)
Wed, 2 Sep 1998 21:51:59 +0200 (CEST)

> > 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?
>
> Unfortunately for the Mach64s, the MMIO registers really overlap with the
> memory, and thus the last 1-2 kilobytes of the video ram are not useable.

I see. Anyone checked what the Mach64 VESA BIOS does? It should either
disable this MMIO area or reduce the video memory size. If it does'nt,
vesafb will crash the gfx board. The vesa specs suggest to use port I/O
instead of MMIO, so I don't expect problems. But who knows...

vesafb will use the whole available video memory (for ypan && scrollback).
If the video memory size reported by the VESA BIOS is not correct => game
over.

Gerd

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