We don't maintain our own (modified) xilinx dma driver anymore! The original xilinx dma driver in the Linux kernel tree can be used. ===============Following are obsolete content================= Currently used driver xilinx_dma-orig.c is based on 552d3f11e374ca0d435aa93a571507819eabdda2 of https://github.com/Xilinx/linux-xlnx ) instruction to generate our customized xilinx dma driver: ./make_xilinx_dma.sh instruction to generate our customized xilinx dma test program: ./make_xilinx_dma_test.sh test dma driver on board: login to zc706, then: rm axidmatest.ko wget ftp://192.168.10.1/driver/xilinx_dma/axidmatest.ko rm ddc.ko wget ftp://192.168.10.1/driver/ddc/ddc.ko rm xilinx_dma.ko wget ftp://192.168.10.1/driver/xilinx_dma/xilinx_dma.ko rmmod axidmatest rmmod ddc rmmod xilinx_dma insmod xilinx_dma.ko insmod ddc.ko insmod axidmatest.ko dmesg -c dmesg will show test result printed by "insmod axidmatest.ko". Like this: root@analog:~# dmesg -c xilinx_dmatest: dropped channel dma5chan0 xilinx_dmatest: dropped channel dma5chan1 sdr,ddc dev_remove base_addr 0xf14e0000 sdr,ddc dev_remove ddc_driver_api_inst 0xbf032284 sdr,ddc dev_remove ddc_api 0xbf032284 sdr,ddc dev_remove succeed! xilinx-vdma 43000000.axivdma: Xilinx AXI VDMA Engine Driver Probed!! xilinx-vdma 80400000.dma: Xilinx AXI DMA Engine Driver Probed!! xilinx-vdma 80410000.dma: Xilinx AXI DMA Engine Driver Probed!! sdr,ddc dev_probe match! sdr,ddc dev_probe io start 0x83c20000 end 0x83c2ffff name /fpga-axi@0/rx_intf@83c20000 flags 0x00000200 desc 0x00000000 sdr,ddc dev_probe base_addr 0xf18e0000 sdr,ddc dev_probe ddc_driver_api_inst 0xbf0e1284 sdr,ddc dev_probe ddc_api 0xbf0e1284 sdr,ddc dev_probe reset tsf timer sdr,ddc dev_probe tsf timer runtime read 1 33007 100015us sdr,ddc dev_probe succeed! sdr,ddc hw_init mode 0 sdr,ddc hw_init mode DDC_AXIS_LOOP_BACK sdr,ddc hw_init err 0 dmatest: Started 1 threads using dma5chan0 dma5chan1 align 3 sdr,ddc hw_init mode 0 sdr,ddc hw_init mode DDC_AXIS_LOOP_BACK sdr,ddc hw_init err 0 tx_tmo 99 status 0 len 6448 DMA_COMPLETE 0 dma5chan0-dma5c: verifying source buffer... dma5chan0-dma5c: verifying dest buffer... dma5chan0-dma5c: #0: No errors with src_off=0x448 dst_off=0x568 len=0x1930 align 3 sdr,ddc hw_init mode 0 sdr,ddc hw_init mode DDC_AXIS_LOOP_BACK sdr,ddc hw_init err 0 tx_tmo 100 status 0 len 3248 DMA_COMPLETE 0 dma5chan0-dma5c: verifying source buffer... dma5chan0-dma5c: verifying dest buffer... dma5chan0-dma5c: #1: No errors with src_off=0x458 dst_off=0xf08 len=0xcb0 align 3 sdr,ddc hw_init mode 0 sdr,ddc hw_init mode DDC_AXIS_LOOP_BACK sdr,ddc hw_init err 0 tx_tmo 100 status 0 len 8112 DMA_COMPLETE 0 dma5chan0-dma5c: verifying source buffer... dma5chan0-dma5c: verifying dest buffer... dma5chan0-dma5c: #2: No errors with src_off=0x10 dst_off=0x20 len=0x1fb0 align 3 sdr,ddc hw_init mode 0 sdr,ddc hw_init mode DDC_AXIS_LOOP_BACK sdr,ddc hw_init err 0 tx_tmo 100 status 0 len 840 DMA_COMPLETE 0 dma5chan0-dma5c: verifying source buffer... dma5chan0-dma5c: verifying dest buffer... dma5chan0-dma5c: #3: No errors with src_off=0x1890 dst_off=0x1268 len=0x348 align 3 sdr,ddc hw_init mode 0 sdr,ddc hw_init mode DDC_AXIS_LOOP_BACK sdr,ddc hw_init err 0 tx_tmo 100 status 0 len 7816 DMA_COMPLETE 0 dma5chan0-dma5c: verifying source buffer... dma5chan0-dma5c: verifying dest buffer... dma5chan0-dma5c: #4: No errors with src_off=0x80 dst_off=0x168 len=0x1e88 dma5chan0-dma5c: terminating after 5 tests, 0 failures (status 0)