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Date:      Thu, 25 Oct 2012 21:55:37 -0700
From:      matt <sendtomatt@gmail.com>
To:        Justin Hibbits <chmeeedalf@gmail.com>
Cc:        freebsd-x11@freebsd.org, freebsd-ppc@freebsd.org
Subject:   Re: Does drm/dri currently work on PPC? (SUCCESS!)
Message-ID:  <508A17C9.4030007@gmail.com>
In-Reply-To: <5089F799.9030507@gmail.com>
References:  <5083C719.1040109@gmail.com> <CAKLtBChswXj7HcZeC=SaJgMNDrZXu==DHFP5PW4wB9=ruKSWWA@mail.gmail.com> <20121021092136.20307802@narn.knownspace> <50846392.70007@gmail.com> <CAHSQbTC7SA8qiVGQi%2BfmsmzYBVQLR09Dmzhjk1Ev=srsufc_HQ@mail.gmail.com> <5085F595.4050609@gmail.com> <20121022215945.436873dc@narn.knownspace> <5089A6DB.9070904@brakiri.com> <5089DF27.9020803@gmail.com> <20121025213018.2bfa5068@narn.knownspace> <5089F799.9030507@gmail.com>

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> 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@openbsd.org, Justin & Nathan!

Matt



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