Re: radeonfb on pegasos powerpc motherboard and X endianess problem

[Sven Luther <sven.luther@wanadoo.fr>]

On Thu, Jun 05, 2003 at 02:27:23PM +0200, Benjamin Herrenschmidt wrote:
> On Thu, 2003-06-05 at 13:58, Sven Luther wrote:
> > On Thu, Jun 05, 2003 at 01:42:30PM +0200, Benjamin Herrenschmidt wrote:
> > > On Thu, 2003-06-05 at 10:19, Sven Luther wrote:
> > > 
> > > > Err, is that the same devel tree as the one in linuxppc_2_4_devel ?
> > > 
> > > No, it's linuxppc_2_4_benh bk, though you can use rsync to extract
> > > just radeonfb from rsync.penguinppc.org::benh-devel.
> > 
> > Mmm, i think i am just a bit lost with all the ppc kernel trees ...
> > Which one should i work on.
> 
> Yup, 2.4 is a mess ... For a new platform like that, I suggest 
> working on linuxppc_2_4 or Marcelo tree directly

Ok.

> > .../...
> >
> > I don't know about the radeon driver exactly but the glint driver i did
> > work on did a mode setup when comming from the VT switch, after having
> > saved the registers it touches for the consoles benefit. It then
> > proceeded to reinitialize the accel pipeline, complete with a sync and
> > all. I guess newer hardware have easier way to do this, and this doesn't
> > speak about the DRI case, but probably all the X driver do it such. When
> > switching back, they restore the registers they have touched, more
> > probably only the mode setting registers, and don't care about the accel
> > regs, since text mode don't touch them.
> 
> Which is the problem ;) radeonfb do use the accel engine for text
> rendering, which is why things aren't pretty when coming from X
> (actually, I noticed X tends to fuckup the accel engine when quit
> even while it's not the frontmost console, so there's probably also
> a bug in X)

Maybe a sync problem or somewhat related with DRI ?

> > Ok, so it must be another kind of problems, but then, my matrox board,
> > which Geert (or someone else) said did run on his chrp board, did not
> > work well for me.
> 
> Could be a problem with how the firmware did/did not initialize it

Actually, the OF has a x86 emulator which runs the x86 bios of the
graphic card. 

Anyway, i will look at it once i have ported the patches.

Friendly,

Sven Luther
> 
> Ben.


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