Graphics Performance

Ian Stirling OpenMoko at
Fri Apr 3 22:14:16 CEST 2009

Iain B. FIndleton wrote:
> It appears to me that the implementation on the FR is not capable of 
> moving an updated frame buffer in memory to the chip's video buffer, 
> presuming they are different, without draping. Since the controller 
> appears to be able to rescan its own video buffer without flicker, 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

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