Comment 21 for bug 1571416

(In reply to Michel Dänzer from comment #4)
> (In reply to Mathieu Malaterre from comment #3)
> > If AGP is simply not supported on PowerPC, it would be nice to have a
> > clearer message (or at least a warning).
>
> It is supported, it's just unstable on many PowerMacs.
>
> A patch disabling AGP by default on PowerMacs or even PPC in general
> probably wouldn't be rejected. :)

Hi, Michel

I don't understand. I know about the coherency issues on some UniNorth bridges (DMA writes through the GART going directly to RAM, IIRC), but how did OS X cope with them? Did it also disable AGP transfers? If not, what can be done to fix this bug for real, instead of working around it? (I have a very vague memory that these hangs didn't happen before KMS, but I may be completely wrong.)
Also, on a somewhat related note, there are still issues with the Radeon (R600, not SI) DRM on big endian, as for https://bugs.freedesktop.org/show_bug.cgi?id=95015.

Thanks,

Rui