On Fri, Apr 03, 2009 at 09:14:16PM +0100, Ian Stirling wrote: > Iain B. FIndleton wrote:
> > I > > wonder what the issue is in moving the frame buffer data? At the speeds > > available on the FR, moving 640 x 480 x 2 = 614,400 bytes from memory to > > a video buffer at 30 Hz needs about 18 MB/sec. > > > > What is the bandwidth for memory moves? > > About 6-8 or so - with 100% CPU utilisation There are four DMA channels in the s3c422b, so you shouldn't use the CPU for straight memcpy() of such large blocks. The kernel doesn't yet support mem->mem DMA transfers, but I'm working on that to use it in the glamo SD card driver. -- Rask Ingemann Lambertsen Danish law requires addresses in e-mail to be logged and stored for a year _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community