Xorg on Fujitsu "Lime" with MPC5200b?
Anatolij Gustschin
agust at denx.de
Thu Apr 15 17:44:13 EST 2010
On Wed, 14 Apr 2010 22:07:08 -0500
Bill Gatliff <bgat at billgatliff.com> wrote:
> Put simply, I have an MPC5200b platform with a Fujitsu "Lime" GDC, and
> I'm trying to run Debian squeeze's xorg on it.
>
> Actually, I *have* Debian squeeze's xorg running on the platform just
> fine, with a 2.6.34-rc1 kernel (kernel.org). Problem is, every single
> diagonal line is very blocky--- not smooth at all. I used to think this
> was a problem with X's fonts, but now I don't think so because the mouse
> cursor's diagonal lines also look equally bad.
>
> It's almost as if any time the platform tries to draw a diagonal line,
> truncation/rounding errors are causing it problems in figuring out which
> pixels to turn on and off.
On all PowerPC based boards with Lime (PPC440EPx, MPC85xx) I have seen so
far there is a similar problem with direct access to the frame buffer in
16-bit mode.
> A non-Linux kernel on this hardware, running a non-X GUI, seems to work
> fine so I think the hardware isn't the problem.
It is possible that this non-X GUI doesn't access the frame buffer directly
but only uses the accelerated driver for rendering. In this case all
drawing is done by Lime itself triggered by 32-bit accesses to the
drawing command FIFO.
> Anyone have any suggestions on where to start with this one? Anyone
> else running a similar configuration with any success? I'm completely
> lost, and running out of hair *fast*...
You probably have to fix Xorg driver for swapping.
Anatolij
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