bcm63xx: add support for Comtrend VR-3032u

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/bcm63xx/base-files/lib/upgrade/platform.sh

@@ -1,9 +1,19 @@
 PART_NAME=linux
+REQUIRE_IMAGE_METADATA=0
+
 platform_check_image() {
 	[ "$#" -gt 1 ] && return 1
+
+	case "$(board_name)" in
+		comtrend,vr-3032u)
+			# NAND sysupgrade
+			return 0
+			;;
+	esac
+
 	case "$(get_magic_word "$1")" in
 		3600|3700|3800)
-			# 6348GW-11 boards use openwrt-96348GW-11-squashfs-cfe.bin files
+			# CFE tag versions
 			return 0
 			;;
 		*)
@@ -13,4 +23,50 @@ platform_check_image() {
 	esac
 }
 
-# use default for platform_do_upgrade()
+cfe_jffs2_upgrade_tar() {
+	local tar_file="$1"
+	local kernel_mtd="$(find_mtd_index $CI_KERNPART)"
+
+	if [ -z "$kernel_mtd" ]; then
+		echo "$CI_KERNPART partition not found"
+		return 1
+	fi
+
+	local board_dir=$(tar tf $tar_file | grep -m 1 '^sysupgrade-.*/$')
+	board_dir=${board_dir%/}
+
+	local kernel_length=$(tar xf $tar_file ${board_dir}/kernel -O | wc -c 2> /dev/null)
+	local rootfs_length=$(tar xf $tar_file ${board_dir}/root -O | wc -c 2> /dev/null)
+
+	if [ "$kernel_length" = 0 ]; then
+		echo "kernel cannot be empty"
+		return 1
+	fi
+
+	flash_erase -j /dev/mtd${kernel_mtd} 0 0
+	tar xf $tar_file ${board_dir}/kernel -O | nandwrite /dev/mtd${kernel_mtd} -
+
+	local rootfs_type="$(identify_tar "$tar_file" ${board_dir}/root)"
+
+	nand_upgrade_prepare_ubi "$rootfs_length" "$rootfs_type" "0" "0"
+
+	local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
+
+	local root_ubivol="$(nand_find_volume $ubidev $CI_ROOTPART)"
+	tar xf $tar_file ${board_dir}/root -O | \
+		ubiupdatevol /dev/$root_ubivol -s $rootfs_length -
+
+	nand_do_upgrade_success
+}
+
+platform_do_upgrade() {
+	case "$(board_name)" in
+		comtrend,vr-3032u)
+			REQUIRE_IMAGE_METADATA=1
+			cfe_jffs2_upgrade_tar "$1"
+			;;
+		*)
+			default_do_upgrade "$1"
+			;;
+	esac
+}