>When I just do >x->command = val; >without out_leXX, is 0x1234 on PCI cards ram in little endian ? no, it will be 0x3412 in PCI card ram. You should use out_leXX to transfer data from system memory to card memory. Regards, Anil. ** Sent via the linuxppc64-dev mail list. See http://lists.linuxppc.org/