On Monday 19 January 2009, Sergei Shtylyov wrote: > > Though having ported EDMA to OMAP-L1x, I haven't delved into the EDMA > spec. as deep as to ascertain whether it can do memory-to-memory > transfers... well, the porting was a relatively simple task anyway, not > requiring deep understanding (and it wasn't even my task originally).
It can do memory-to-memory too. I'd think that a dma version of copy_page() might be an interesting experiment. It should be possible to set things up with a dedicated QDMA channel, so that you can just copy the DMA descriptor into the parameter RAM slot and wait for it to complete. Flush source cache first; invalidate destination cache before waiting; and I suspect it could outperform the CPU version. When I did such experiments with the DMA engine framework, the CPU copy was invariably faster. - Dave _______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
