i tried to fetch data from periphial memories with DMA the flow as following
flags = claim_dma_lock(); disable_dma(DMA_CH); clear_dma_ff(); set_dma_count(DMA_CH, 4); set_dma_addr(DMA_CH, virt_to_bus(kv_buf)); release_dma_lock(flags); enable_dma(DMA_CH); the code hault at disable_dma(DMA_CH) in addition, i defined DMA_CH as 0 for channel 0 'kv_buf' is an kernel space virtual address. i can red the correct value of periphal from this address i supposed the fault along with the configured of registers about DMA in processer. but i am not sure. give some suggestion about this, thanks! -- View this message in context: http://www.nabble.com/get-data-failed-with-DMA-tp23494879p23494879.html Sent from the linuxppc-dev mailing list archive at Nabble.com. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
