this is a ppc405 -based controller question but has bearing on the right way to DMA under linux, in general:
I have an application in which I'll be DMAing several megabytes from memory into a fifo; the data are cpu-created so I'd expect I'd need to flush the data cache prior to starting the DMA. is this implicitly done by any of the setup & start-dma calls or should I explicitly do this myself. also, give the sizeof the source buffer and the smallness of the 405 data cache, I'd expect I should flush the entire cache to memory (flush pending writes) rather than for the entire address range of the source buffer. thoughts? thanks, Mark -- Mark Pilon Minolta-QMS P.O. Box 37 325 Dawson County Road 227 Fallon, MT. 59326-0037 1-406-486-5539 (primary voice line) 1-406-853-0433 (cell) ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
