mediatek: add bpi-r64 emmc support

Signed-off-by: John Crispin <john@phrozen.org>

target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh

@@ -2,6 +2,11 @@ platform_do_upgrade() {
 	local board=$(board_name)
 
 	case "$board" in
+	bananapi,bpi-r64-rootdisk)
+		#2097152=0x200000 is the offset in bytes from the start
+		#of eMMC and to the location of the kernel
+		get_image "$1" | dd of=/dev/mmcblk0 bs=2097152 seek=1 conv=fsync
+		;;
 	*)
 		default_do_upgrade "$1"
 		;;
@@ -17,19 +22,30 @@ platform_check_image() {
 	[ "$#" -gt 1 ] && return 1
 
 	case "$board" in
-	elecom,wrc-2533gent)
+	*)
 		[ "$magic" != "d00dfeed" ] && {
 			echo "Invalid image type."
 			return 1
 		}
 		return 0
 		;;
-
-	*)
-		echo "Sysupgrade is not supported on your board yet."
-		return 1
-		;;
 	esac
 
 	return 0
 }
+
+platform_copy_config_emmc() {
+	mkdir -p /recovery
+	mount -o rw,noatime /dev/mmcblk0p6 /recovery
+	cp -af "$UPGRADE_BACKUP" "/recovery/$BACKUP_FILE"
+	sync
+	umount /recovery
+}
+
+platform_copy_config() {
+	case "$(board_name)" in
+	bananapi,bpi-r64-rootdisk)
+		platform_copy_config_emmc
+		;;
+	esac
+}