Re: FB and MTRR
Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
Wed, 5 Aug 1998 13:49:59 +0200 (CEST)
On Wed, 5 Aug 1998, Richard Gooch wrote:
> Martin Mares writes:
> > > Isn't it a bad idea to touch the old VGA registers? I thought it was
> > > better to use the new PCI space registers (so you can support multiple
> > > heads)?
> >
> > Unfortunately, different PCI video cards have different register
> > addressing :(
>
> Sorry, I'm missing the significance of that. My point was that the old
> VGA registers mapped to < 1 MByte limit you to one card, so would it
> not be better to have the FB code access the registers mapped to the
> PCI space?
Martin is right about this: mirros of the VGA registers in PCI memory space are
nonstandard and differ between different video chipsets.
Greetings,
Geert
--
Geert Uytterhoeven Geert.Uytterhoeven@cs.kuleuven.ac.be
Wavelets, Linux/{m68k~Amiga,PPC~CHRP} http://www.cs.kuleuven.ac.be/~geert/
Department of Computer Science -- Katholieke Universiteit Leuven -- Belgium
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