nWAITing for Glamo

Carsten Haitzler (The Rasterman) raster at openmoko.org
Wed Jul 16 15:08:14 CEST 2008

On Tue, 15 Jul 2008 20:45:25 -0300 Werner Almesberger <werner at openmoko.org>

> Carsten Haitzler wrote:
> > if we have a 2442 with a dumb framebuffer i'd get 13fps.
> Does this take into account the memory bandwidth taken up by the screen
> refresh ? If not, it would even be less than 13fps :-(

aah indeed no it doesn't, but i'd drop that from 13 to 11-12fps then if my
calculations are right. :)

> If you want to test this, I think you could just set up the 2442's LCD
> controller and let it pump out data into nothingness. As long as the
> GPIOs aren't reconfigured, the LCD controller sending data to them
> shouldn't matter. You don't even need a kernel change - you could write
> the registers directly from user space, using mmap. See also
> http://svn.openmoko.org/trunk/src/target/gpio/gpio.c
> I think this would be a very interesting test, giving us a precise
> indication what performance we could expect when we remove the Glamo.
> - Werner

Carsten Haitzler (The Rasterman) <raster at openmoko.org>

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