Messages in this thread | | | Date | Wed, 5 Aug 1998 21:54:23 +1000 | From | Richard Gooch <> | Subject | Re: FB and MTRR |
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Geert Uytterhoeven writes: > 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.
Is this a problem because you couldn't then have a plain VGA driver? If so now I finally understand the point. That then imples that the plain VGA/VESA driver can only ever support one card, whereas a chipset-specific driver can support multiple cards?
Regards,
Richard....
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