Hi Ira, I've tried your patches with linux-2.6.38-rc6 on P2020RDB. DMA test fails with the following errors if threads_per_chan != 1 dma0chan0-copy1: terminating after 1 tests, 1 failures (status 0) dma0chan0-copy2: #0: test timed out I've run the test like this: modprobe dmatest threads_per_chan=2 iterations=1 Felix.