imx6: add sysupgrade support

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41277 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/imx6/base-files/lib/upgrade/platform.sh

@@ -0,0 +1,19 @@
+#
+# Copyright (C) 2010 OpenWrt.org
+#
+
+. /lib/functions/imx6.sh
+
+platform_check_image() {
+	local board=$(imx6_board_name)
+
+	case "$board" in
+	gw54xx)
+		nand_do_platform_check $board $1
+		return $?;
+		;;
+	esac
+
+	echo "Sysupgrade is not yet supported on $board."
+	return 1
+}