r127 w/ KMS on PPC?

[Alex Buell]

On Wed, 2010-04-21 at 20:38 -0400, Alex Deucher wrote:
> On Wed, Apr 21, 2010 at 6:26 PM, Alex Buell <alex.buell at munted.org.uk> wrote:
> > On Thu, 2010-04-22 at 07:55 +1000, Dave Airlie wrote:
> >> > I'd like to step up for that, it'd let me learn a lot. I have
> >> already
> >> > extracted the r128 and its DRI from the 2.6.32 kernel tree and built
> >> > them as modules and they both work just fine, with the binary
> >> firmware.
> >> > What's involved in making KMS work on PPC? I'm sure I need the KMS
> >> > helpers and the TTM module as well right?
> >>
> >> For r128, it could actually re-use a lot of the radeon KMS code, in
> >> fact nearly all of it.
> >>
> >> Alex Deucher started doing a UMS merge of radeon/r128 at one point
> >> http://cgit.freedesktop.org/~agd5f/xf86-video-ati/log/?h=r128-support
> >>
> >> the main things would be adding the differences in the bios parsing,
> >> and modesetting paths to KMS first.
> >
> > I'll start digging into the Radeon, see what I can learn about KMS
> > integration. For now I'll build the r128 out of the tree, simplifies
> > things a bit. Is that OK?
> >
> > Any further reading would be tremendously helpful.
> >
> 
> It should be pretty easy to get kms going with r128 by integrating it
> into the radeon drm and ddx.  The hard part will be porting the r128
> 3D driver to kms.  Also, kms support for r128-based macs will be a bit
> trickier than x86 because the boards don't have an x86 video bios.
> You may have to look at the xf86-video-r128 ddx and atyr128 kernel fb
> driver for properly setting up the cards without an x86 bios.  Let me
> know if you have any questions.

Whilst hacking on the drm and r128 sources out of the tree I noticed a
peculiarity of the build process. It turns out that if you build the
r128 module separately after working on it, and insmod both drm and r128
modules, it spits out a lot missing drm_* symbols. However, if I build
both drm and r128 modules then insmod both modules, it doesn't spit out
any missing drm_* symbols. I don't quite understand why this happens,
but for now I just start the build in the drm directory instead.
-- 
http://www.munted.org.uk

One very high maintenance cat living here.