Does drm/dri currently work on PPC? (SUCCESS!)

matt sendtomatt at
Fri Oct 26 04:55:59 UTC 2012

> It was working without DRM "out-of-the-box". Of course I've made a mess
> trying different versions of both Xorg and the radeon driver. I'm in the
> process of getting back to the working config so I can be sure any test
> changes work/don't work.
> OpenBSD's mpi@ apparently did a lot recently over there getting DRM to
> work on the G4 mini. We already had about half of the commits I see at
> freshbsd, in one way or another...Our rmb/wmb() I think has had PPC
> barriers since earlier this year? He did #define __BIG_ENDIAN, which
> apparently was a big deal for the drm code (it's ifdef'd in a couple
> places), not sure if we are already doing that.
> If someone has a G4 radeon mini they could test to see if drm works for
> them or not, to rule out AGP issues (I guess they are PCI?).
> I'm not sure how the OpenBSD attachment process works vs ours, some of
> the other commits of note were related to passing the BAR and memory
> regions from the vgapci to drm. When I kldload drm after compiling it,
> it doesn't do anything...but if I kldload radeon.ko, it recognizes agp
> memory and being related to vgapci at the correct pci address...I'm not
> sure if we "are there" or not. I also didn't have DRM on OpenBSD either.
> I think if radeon had drm on *any* big-endian platform it should rule
> out endian issues in drm or radeon. Not sure if this is the case, I
> guess macppc would be the most likely.
> Matt
So I removed WITH_NEW_XORG, deinstalled a ton of ports, and reinstalled
Xorg. I rebuild drm with __BIG_ENDIAN defined (not sure if this
matters). I previously put a lot of WERROR= and NO_WERROR= into various
drm makefiles to get gcc to shut up about unused return values. X
-configure worked, and the xorg log indicates the drm device was
successfully opened and I have drm on PPC.
mesa-demos is marked broken for PPC, haven't tried glxinfo or glxgears yet.

The good news is it works!
The bad news:
-Cannot switch back to syscons, screen gets corrupted then the system
hard locks
-WITH_NEW_XORG breaks it somehow

Thanks to mpi at, Justin & Nathan!


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