OK, I now see what you're driving at. I haven't looked closely at the
FB code, but I had assume that mtrr_add() was called "safely"
(i.e. for framebuffer RAM only and not for MMIO registers). I guess
that's not the case?
So the PCI bus addresses that the FB code finds may well contain MMIO
registers?
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?
Regards,
Richard....
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