[Letux-kernel] fb tiler considered harmful

Andreas Kemnade andreas at kemnade.info
Wed Feb 8 17:16:31 CET 2017


On Wed, 8 Feb 2017 07:19:56 +0100
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> Hi Andreas,
> 
> > Am 08.02.2017 um 06:52 schrieb Andreas Kemnade
> > <andreas at kemnade.info>:
> > 
> > Hi,
> > 
> > As I wanted to test the new alsa routing patches, there was one
> > problem: No Framebuffer output,
> > 
> > Suspicious pieces in console log:
> > [    2.556823] omapdrm omapdrm.0: DMM not available, disable DMM
> > support [    2.565490] [drm] Supports vblank timestamp caching Rev
> > 2 (21.10.2013). [    2.565551] [drm] No driver support for vblank
> > timestamp query. [    2.566528] omapdrm omapdrm.0: Tiled buffers
> > require DMM [    2.567382] omapdrm omapdrm.0: failed to allocate
> > buffer object [    2.567718] omapdrm omapdrm.0: omap_fbdev_init
> > failed [    2.567932] [drm] Initialized omapdrm 1.0.0 20110917 on
> > minor 0
> > 
> > I have to add that I have compiled the framebuffer statically and
> > using it for console output.
> > 
> > After reverting the following branches, the framebuffer worked
> > again.
> > 
> > extern/mvduin/patch/tiler-buf-dumb
> > extern/mvduin/patch/tiler-fbdev
> 
> Thanks for noting!
> 
> This means the TILER should somehow be made OMAP5 (Pyra) only or fixed
> to gracefully handle OMAP3.
> 
Attached is the config I used. It was working with letux_defconfig.
As said the probably most relevant difference is that the framebuffer
is compiled statically.

Regards,
Andreas
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