-dtc -I dts -O dtb test/dm/test.dts -o test/dm/test.dtb
-make O=sandbox sandbox_config
-make O=sandbox -s -j${NUM_CPUS}
-./sandbox/u-boot -d test/dm/test.dtb -c "dm test"
+make O=sandbox sandbox_config || die "Cannot configure U-Boot"
+make O=sandbox -s -j${NUM_CPUS} || die "Cannot build U-Boot"
+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 "ut dm"
+rm spi.bin
+rm testflash.bin