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

matt sendtomatt at
Sat Oct 27 01:12:14 UTC 2012

On 10/26/12 11:51, Andreas Tobler wrote:
> On 26.10.12 16:31, Nathan Whitehorn wrote:
>> On 10/25/12 23:55, matt wrote:
>>>> 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!
>>> Matt
>>> _______________________________________________
>>> freebsd-ppc at mailing list
>>> To unsubscribe, send any mail to "freebsd-ppc-unsubscribe at"
>> Great to hear! I checked in some code to define __BIG_ENDIAN if needed
>> in -CURRENT's drm (Linux uses a different number of underscores than we
>> do for perverse reasons).
> Thank you very much all!
> I can confirm it works here too (G5 32-bit):
> [helium:~] andreast% dmesg |grep drm
> drm0: <ATI Radeon AR 9600 XT> on vgapci0
> info: [drm] Initialized radeon 1.31.0 20080613
> info: [drm] Setting GART location based on new memory map
> info: [drm] Loading R300 Microcode
> info: [drm] Num pipes: 1
> info: [drm] writeback test succeeded in 1 usecs
> and glxgears gives around 1250FPS vs. 52FPS w/o dri.
> Andreas
Can you change consoles or exit X successfully?
btw...issue "sync" a couple times first just in case :)
Also, is that an AGP or PCIe G5?



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