[Bug 95017] [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on GFX ring (-35).

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95017

--- Comment #10 from Rui Salvaterra <rsalvaterra at gmail.com> ---
(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

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