[PATCH] Big Endian support for RV730 (Mesa r600)

Benjamin Herrenschmidt benh at kernel.crashing.org
Wed Apr 13 05:10:18 PDT 2011

On Wed, 2011-04-13 at 22:05 +1000, Benjamin Herrenschmidt wrote:
> On Tue, 2011-04-12 at 10:01 +0200, Cédric Cano wrote:
> > Hi
> > 
> > Here you are a patch that adds big endian support for rv730 in r600 
> > classic mesa driver. The BE modifications are almost the same as the DRM 
> > / DDX driver modifications 
> > (http://lists.freedesktop.org/archives/dri-devel/2011-February/008151.html).
> > 
> > I used the mesa-demos to test the driver status on big endian platform. 
> > Nearly all demos renders the same as on Intel architecture. 
> > Nevertheless, there are still some issues in glReadPixels (r600_blit) 
> > with some formats. I can't figure out exactly what and when data must be 
> > swapped (set_tex_resoures, set_render_target...). Review of the patch 
> > would be greatly appreciated.
> > 
> > It seems that r600g will be the default for Mesa 7.11 so I'll try to 
> > enable big endian support for Gallium now.
> Cool stuff !
> I'll try to test that one of these days on various ppc's

BTW. I see you used some FSL embedded board. Do you have your PCIe MMIO
space above 32-bit ? Last I looked, there was a bunch of fixing needing
to be done, among others in the TTM, to make that work.

I had some preliminary patches but they bitrot... mostly the issue is to
make sure than a phys_addr_t is used instead of an unsigned long
whenever it tries to store the physical address of an object.


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