> Richard Gooch wrote:
> > OK, that would make sense if the write-combining is fouling up MMIO
> > register access. Can you please patch your kernel where it calls
> > mtrr_add() and add another call to mtrr_add() so that you set up a
> > small uncacheable region either at the beginning or the end of the
> > framebuffer?
> > With luck that will fix it. If it does, start trimming the uncacheable
> > region down in size until it fails again. That will tell you the
> > minimum size of the register region. If you're unsure of how big a
> > region to start with (say 4 kBytes still fails), make the entire
> > framebuffer uncacheable and step down in factors of two.
>
> Ok -- I patched vesafb.c as follows:
>
> mtrr_add((unsigned long)video_base, video_size, MTRR_TYPE_WRCOMB, 1);
> + mtrr_add((unsigned long)video_base, video_size, MTRR_TYPE_UNCACHABLE,
> 1);
>
> I still got the lockup.
>
> -Tom
Is /proc/pci showing two memory addresses for your card ? The MMIO
registers could be after video memory (like on my ATI All-in-Wonder)
Vladimir Dergachev
> --
> Tom Eastep Tandem Division of COMPAQ
> tom.eastep@tandem.com
>
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