dd if="$2" of="$root" bs=$BLKSZ conv=sync 2>/dev/null
# Calculate md5sum over combined kernel and rootfs image.
-md5=$(cat "$kern" "$root" | md5sum -)
+md5=$(cat "$kern" "$root" | mkhash md5)
# Write image header followed by kernel and rootfs image.
# The header is padded to 64k, format is: