On 2010-10-18 21:53, Andreas Fritiofson wrote:
Well, that's BS. The STM32 flash has a nominal programming time of 52.5µs per 16 bits. So the theoretical max speed anyone can achieve is roughly 37.2 KiBytes/s. If you see claims of speeds way above that they're either lies, load-to-ram figures or a mixup in units.
That's the screenshot http://obrazki.elektroda.net/56_1286356404.jpg
That said, I think it should be possible to crank up the STM32 flash programming speed in OpenOCD by at least a factor of two. I don't know what the bottleneck is, but like you I have concluded that JTAG frequency is not the major issue here. My guess is that the programming algorithm we use might be quite inefficient. USB latency might play a role but with double buffering and other tricks in the algorithm the latency shouldn't be a limiting factor.
That would be very cool to tune OpenOCD up! 4\/3!! _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
