dd if=/dev/zero of=spi.bin bs=1M count=2
echo -n "this is a test" > testflash.bin
dd if=/dev/zero bs=1M count=4 >>testflash.bin
-./sandbox/u-boot -d ./sandbox/arch/sandbox/dts/test.dtb -c "dm test"
+./sandbox/u-boot -d ./sandbox/arch/sandbox/dts/test.dtb -c "ut dm"
rm spi.bin
rm testflash.bin