make O=sandbox sandbox_config || die "Cannot configure U-Boot"
make O=sandbox -s -j${NUM_CPUS} || die "Cannot build U-Boot"
dd if=/dev/zero of=spi.bin bs=1M count=2
make O=sandbox sandbox_config || die "Cannot configure U-Boot"
make O=sandbox -s -j${NUM_CPUS} || die "Cannot build U-Boot"
dd if=/dev/zero of=spi.bin bs=1M count=2