difos/target/linux/mediatek/mt7623/base-files/lib/upgrade/platform.sh

platform_do_upgrade() {
	local board=$(board_name)

	case "$board" in
	bananapi,bpi-r2)
		local diskdev partdev diff

		export_bootdevice && export_partdevice diskdev 0 || {
			echo "Unable to determine upgrade device"
			return 1
		}

		#Keep the persistent random mac address (if it exists)
		mkdir -p /tmp/recovery
		export_partdevice recoverydev 2
		if mount -o rw,noatime "/dev/$recoverydev" -tvfat /tmp/recovery; then
			[ -f "/tmp/recovery/mac_addr" ] && cp /tmp/recovery/mac_addr /tmp/
			umount /tmp/recovery
		fi
		sync

		if [ "$SAVE_PARTITIONS" = "1" ]; then
			get_partitions "/dev/$diskdev" bootdisk

			#extract the boot sector from the image
			get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b

			get_partitions /tmp/image.bs image

			#compare tables
			diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
		else
			diff=1
		fi

		if [ -n "$diff" ]; then
			get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync

			# Separate removal and addtion is necessary; otherwise, partition 1
			# will be missing if it overlaps with the old partition 2
			partx -d - "/dev/$diskdev"
			partx -a - "/dev/$diskdev"
		else
			#iterate over each partition from the image and write it to the boot disk
			while read part start size; do
				part="$(($part - 2))"
				if export_partdevice partdev $part; then
					echo "Writing image to /dev/$partdev..."
					get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
				else
				    echo "Unable to find partition $part device, skipped."
				fi
			done < /tmp/partmap.image

			#copy partition uuid
			echo "Writing new UUID to /dev/$diskdev..."
			get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
		fi

		if mount -o rw,noatime "/dev/$recoverydev" -t vfat /tmp/recovery; then
			[ -f "/tmp/mac_addr" ] && cp /tmp/mac_addr /tmp/recovery

			if [ "$diskdev" = "mmcblk0" -a -r /tmp/recovery/eMMCboot.bin ]; then
				echo 0 > /sys/block/mmcblk0boot0/force_ro
				dd if=/tmp/recovery/eMMCboot.bin of=/dev/mmcblk0boot0 conv=fsync
				sync
				echo 1 > /sys/block/mmcblk0boot0/force_ro
			fi
			sync
			umount /tmp/recovery
		fi
		;;

	unielec,u7623-02-emmc-512m)
		#Keep the persisten random mac address (if it exists)
		mkdir -p /tmp/recovery
		mount -o rw,noatime /dev/mmcblk0p1 /tmp/recovery
		[ -f "/tmp/recovery/mac_addr" ] && \
			mv -f /tmp/recovery/mac_addr /tmp/
		umount /tmp/recovery

		#1310720 is the offset in bytes from the start of eMMC and to
		#the location of the kernel (2560 512 byte sectors)
		get_image "$1" | dd of=/dev/mmcblk0 bs=1310720 seek=1 conv=fsync

		mount -o rw,noatime /dev/mmcblk0p1 /tmp/recovery
		[ -f "/tmp/mac_addr" ] && mv -f /tmp/mac_addr /tmp/recovery
		sync
		umount /tmp/recovery
		;;
	*)
		default_do_upgrade "$1"
		;;
	esac
}

PART_NAME=firmware

platform_check_image() {
	local board=$(board_name)
	local magic="$(get_magic_long "$1")"
	local diskdev partdev diff

	[ "$#" -gt 1 ] && return 1

	case "$board" in
	bananapi,bpi-r2)
		[ "$magic" != "53444d4d" ] && {
			echo "Invalid image type."
			return 1
		}
		export_bootdevice && export_partdevice diskdev 0 || {
			echo "Unable to determine upgrade device"
			return 1
		    }

		get_partitions "/dev/$diskdev" bootdisk

		#extract the boot sector from the image
		get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null

		get_partitions /tmp/image.bs image

		#compare tables
		diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"

		rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image

		if [ -n "$diff" ]; then
			echo "Partition layout has changed. Full image will be written."
			ask_bool 0 "Abort" && exit 1
			return 0
		fi
		;;
	unielec,u7623-02-emmc-512m)
		[ "$magic" != "27051956" ] && {
			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() {
	local partdev

	if export_bootdevice && export_partdevice partdev $1; then
		mkdir -p /recovery
		mount -o rw,noatime "/dev/$partdev" -t vfat /recovery
		cp -af "$UPGRADE_BACKUP" "/recovery/$BACKUP_FILE"
		sync
		umount /recovery
	fi
}

platform_copy_config() {
	case "$(board_name)" in
	bananapi,bpi-r2)
		platform_copy_config_emmc 2
		;;
	unielec,u7623-02-emmc-512m)
		platform_copy_config_emmc 1
		;;
	esac
}