sysupgrade for adm5120

Sysupgrade adapted from the bcm47xx one.

Add a hook to disable watchdog before upgrading.

Signed-off-by: Frédéric Moulins <ffrrrr@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12694 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/adm5120/base-files/lib/upgrade/platform.sh

@@ -0,0 +1,25 @@
+PART_NAME=partition1
+
+platform_check_image() {
+	[ "$ARGC" -gt 1 ] && return 1
+
+	case "$(get_magic_word "$1")" in
+		# .trx files
+		4844) return 0;;
+		*)
+			echo "Invalid image type. Please use only .trx files"
+			return 1
+		;;
+	esac
+}
+
+# use default for platform_do_upgrade()
+
+disable_watchdog() {
+	killall watchdog
+	( ps | grep -v 'grep' | grep '/dev/watchdog' ) && {
+		echo 'Could not disable watchdog'
+		return 1
+	}
+}
+append sysupgrade_pre_upgrade disable_watchdog