ramips: add user space support for the DIR-645

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 33844

target/linux/ramips/base-files/lib/upgrade/platform.sh

@@ -57,6 +57,13 @@ platform_check_image() {
 		}
 		return 0
 		;;
+	dir-645)
+		[ "$magic" != "5ea3a417" ] && {
+			echo "Invalid image type."
+			return 1
+		}
+		return 0
+		;;
 	esac
 
 	echo "Sysupgrade is not yet supported on $board."