neil at ossau.homelinux.net
Fri Oct 21 14:44:18 CEST 2011
On Fri, 21 Oct 2011 14:14:52 +0200, Dr. H. Nikolaus Schaller wrote:
> Hi Neil,
Hi, thanks for the quick reply.
> I have not looked into details but I think all the drivers are
> open source and free.
Just to be clear: I wasn't questioning whether the _currently_ used
drivers are free; my doubt was only about the newer "xf86-video-omap"
driver, which GTA04 isn't using now.
> On the kernel level there was a 'DSS' driver which was replaced
> by a new DSS2 driver. That one allows to control the OMAP
> display hardware controllers so that they DMA from memory
> through an overlay manager to either LCD and/or TV out.
> I think the DSS2 is also capable for rotation (it would just
> address the framebuffer memory differently) but some bits and
> pieces may be missing in the 2.6.32 kernel.
Yes. I found
It looks like rotation might be as simple as adding omapfb.rotate=3 to
the boot command line.
Do you know if it's generally safe to play with this kind of thing? Or
do I risk frying my components?
> About the references you have found I think they are yet
> another video driver. I am not sure if it will replace DSS2
> but some hints are that it is about dynamic memory allocation
> in the kernel and zero-effort rotation.
And 2D acceleration, I believe.
But anyway; after seeing xrandr not work, I had jumped a bit too
quickly to the conclusion that a different video driver (i.e. omap
instead of omapfb) would be better. But thanks to your reply I can now
see that it will probably be quite easy to get rotation with the
existing driver. It just needs a little experimentation.
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