There isnt any way to tell, at least not for sure, if the card will
get upset by write gathering or has MMIO registers in the same block as
the frame buffer [etc]
> So the PCI bus addresses that the FB code finds may well contain MMIO
> registers?
Unlikely but possible. Fortunately its not very hard to build a PCI
"ok card" list and it will take almost no space (0 in fact if its __init).
vesafb is a console, so it "has to work".
> What's the story with cards that would be safe to make the FB
> write-combining? Do they only have their registers in a separate
> region? I would have thought that this is generally how it's done with
> PCI cards?
Normally yes.
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