layerscape: support sysupgrade for SD card ext4 rootfs

Support sysupgrade for SD card ext4 rootfs.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

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

@@ -8,6 +8,85 @@ RAMFS_COPY_DATA="/etc/fw_env.config /var/lock/fw_printenv.lock"
 
 REQUIRE_IMAGE_METADATA=1
 
+platform_check_image_sdboot() {
+	local diskdev partdev diff
+
+	export_bootdevice && export_partdevice diskdev 0 || {
+		echo "Unable to determine upgrade device"
+		return 1
+	}
+
+	# get partitions table from boot device
+	get_partitions "/dev/$diskdev" bootdisk
+
+	# get partitions table from sysupgrade.bin
+	dd if="$1" of=/tmp/image.bs bs=512b count=1 > /dev/null 2>&1
+	sync
+	get_partitions /tmp/image.bs image
+
+	# compare tables
+	diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
+
+	rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
+
+	if [ -n "$diff" ]; then
+		echo "Partition layout has changed. Full image will be written."
+		ask_bool 0 "Abort" && exit 1
+		return 0
+	fi
+}
+platform_do_upgrade_sdboot() {
+	local diskdev partdev diff
+
+	export_bootdevice && export_partdevice diskdev 0 || {
+		echo "Unable to determine upgrade device"
+		return 1
+	}
+
+	if [ "$UPGRADE_OPT_SAVE_PARTITIONS" = "1" ]; then
+		# get partitions table from boot device
+		get_partitions "/dev/$diskdev" bootdisk
+
+		# get partitions table from sysupgrade.bin
+		dd if="$1" of=/tmp/image.bs bs=512b count=1 > /dev/null 2>&1
+		sync
+		get_partitions /tmp/image.bs image
+
+		# compare tables
+		diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
+	else
+		diff=1
+	fi
+
+	if [ -n "$diff" ]; then
+		dd if="$1" of="/dev/$diskdev" bs=1024 count=4 > /dev/null 2>&1
+		dd if="$1" of="$diskdev" bs=1024 skip=4 seek=16384 > /dev/null 2>&1
+		sync
+
+		# 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"
+
+		return 0
+	fi
+
+	# write kernel image
+	dd if="$1" of="$diskdev" bs=1024 skip=4 seek=16384 count=16384 > /dev/null 2>&1
+	sync
+
+	# iterate over each partition from the image and write it to the boot disk
+	while read part start size; do
+		if export_partdevice partdev $part; then
+			echo "Writing image to /dev/$partdev..."
+			dd if="$1" of="/dev/$partdev" bs=512 skip="$start" count="$size" > /dev/null 2>&1
+			sync
+		else
+			echo "Unable to find partition $part device, skipped."
+		fi
+	done < /tmp/partmap.image
+
+}
 platform_do_upgrade_traverse_nandubi() {
 	bootsys=$(fw_printenv bootsys | awk -F= '{{print $2}}')
 	newbootsys=2
@@ -25,6 +104,15 @@ platform_do_upgrade_traverse_nandubi() {
 	nand_do_upgrade "$1" || (echo "Upgrade failed, setting bootsys ${bootsys}" && fw_setenv bootsys $bootsys)
 
 }
+platform_copy_config() {
+	local partdev parttype=ext4
+
+	if export_partdevice partdev 1; then
+		mount -t $parttype -o rw,noatime "/dev/$partdev" /mnt
+		cp -af "$UPGRADE_BACKUP" "/mnt/$BACKUP_FILE"
+		umount /mnt
+	fi
+}
 platform_check_image() {
 	local board=$(board_name)
 
@@ -43,6 +131,14 @@ platform_check_image() {
 	fsl,ls2088a-rdb)
 		return 0
 		;;
+	fsl,ls1012a-frwy-sdboot | \
+	fsl,ls1021a-twr-sdboot | \
+	fsl,ls1043a-rdb-sdboot | \
+	fsl,ls1046a-rdb-sdboot | \
+	fsl,ls1088a-rdb-sdboot)
+		platform_check_image_sdboot "$1"
+		return 0
+		;;
 	*)
 		echo "Sysupgrade is not currently supported on $board"
 		;;
@@ -72,6 +168,14 @@ platform_do_upgrade() {
 		PART_NAME=firmware
 		default_do_upgrade "$1"
 		;;
+	fsl,ls1012a-frwy-sdboot | \
+	fsl,ls1021a-twr-sdboot | \
+	fsl,ls1043a-rdb-sdboot | \
+	fsl,ls1046a-rdb-sdboot | \
+	fsl,ls1088a-rdb-sdboot)
+		platform_do_upgrade_sdboot "$1"
+		return 0
+		;;
 	*)
 		echo "Sysupgrade is not currently supported on $board"
 		;;