2009 MAR 04 fixed checksum failed USB DATA should be Addr(4) + Size(4) + Data(n) + CS(2) you can ref usbt-otg-hs.c use u8 for u16_checksum creator --------------------------- DNW kernel mode driver v1.1 almost working on SAMSUNG 6410 [0]Usage *\>sudo insmod dnw.ko *\>dnw-send(command mode) or dnw_cmd(GUI mode) *Note:To edit ~/.dnwrc ,~/.dnwrc0 [1]Data Flow *USB Host(X86) <-- DNW_OTG(S3C) [2]Packet Format *(RAM addr)(file size+8)(file content) e.g. 00 00 E0 57 50 01 00 00 13 00 00 EA ... ... ---RAMAddr- --file LEN- ---image content--- [3]USB data capture from USB Monitor(USB Analyzer). *Refer to s3c-otg.txt [4]USB proc information and debug monitor in Linux kernel *proc information \>sudo mount -t usbfs none /proc/bus/usb/ *debug monitor \>sudo insmod usbmon \>sudo mount -t debugfs none_debugs /sys/kernel/debug/ \>sudo cat /sys/kernel/debug/usbmon/5t > /tmp/usb_debug.log & if you have problem for .dnwrc cp dnwrc to ~/.dnwrc