ar71xx/all0258n: sysupgrade support

U-Boot on the ALL0258N needs offset, size and md5 for kernel and rootfs to be
stored in the U-Boot environment.
If the checksums don't match during boot, a failsafe-system is booted instead.
This patch adds a board-specific sysupgrade hack for the all0258n which
calculates and updates the checksums for the U-Boot environment.

Signed-off-by: Daniel Golle <dgolle@allnet.de>

SVN-Revision: 28700

target/linux/ar71xx/base-files/lib/upgrade/all0258n.sh

@@ -0,0 +1,161 @@
+# The U-Boot loader of the ALL0258N requires image sizes and checksums to be
+# provided in the U-Boot environment.
+# In case the check fails during boot, a failsafe-system is started to provide
+# a minimal web-interface for flashing a new firmware.
+
+CI_FLADDR=0x9f050000
+
+# make sure we got uboot-envtools and fw_env.config copied over to the ramfs
+platform_add_ramfs_ubootenv() {
+	[ -e /usr/sbin/fw_printenv ] && install_bin /usr/sbin/fw_printenv /usr/sbin/fw_setenv
+	[ -e /etc/fw_env.config ] && install_file /etc/fw_env.config
+}
+append sysupgrade_pre_upgrade platform_add_ramfs_ubootenv
+
+# determine size of the main firmware partition
+platform_get_firmware_size() {
+	local dev size erasesize name
+	while read dev size erasesize name; do
+		name=${name#'"'}; name=${name%'"'}
+		case "$name" in
+			firmware)
+				printf "%d" "0x$size"
+				break
+			;;
+		esac
+	done < /proc/mtd
+}
+
+# get the first 4 bytes (magic) of a given file starting at offset in hex format
+get_magic_long_at() {
+	dd if="$1" skip=$(( $CI_BLKSZ / 4 * $2 )) bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
+}
+
+get_filesize() {
+	wc -c "$1" | while read image_size _n ; do echo $image_size ; break; done
+}
+
+# scan through the update image pages until matching a magic
+platform_get_offset() {
+	offsetcount=0
+	magiclong="x"
+	if [ -n "$3" ]; then
+		offsetcount=$3
+	fi
+	while magiclong=$( get_magic_long_at "$1" "$offsetcount" ) && [ -n "$magiclong" ]; do
+		case "$magiclong" in
+			"2705"*)
+				# U-Boot image magic
+				if [ "$2" = "uImage" ]; then
+					echo $offsetcount
+					return
+				fi
+			;;
+			"68737173"|"73717368")
+				# SquashFS
+				if [ "$2" = "rootfs" ]; then
+					echo $offsetcount
+					return
+				fi
+			;;
+			"deadc0de"|"19852003")
+				# JFFS2 empty page
+				if [ "$2" = "rootfs-data" ]; then
+					echo $offsetcount
+					return
+				fi
+			;;
+		esac
+		offsetcount=$(( $offsetcount + 1 ))
+	done
+}
+
+platform_check_image_all0258n() {
+	local fw_printenv=/usr/sbin/fw_printenv
+	[ ! -n "$fw_printenv" -o ! -x "$fw_printenv" ] && {
+		echo "Please install uboot-envtools!"
+		return 1
+	}
+
+	[ ! -r "/etc/fw_env.config" ] && {
+		echo "/etc/fw_env.config is missing"
+		return 1
+	}
+
+	local image_size=$( get_filesize "$1" )
+	local firmware_size=$( platform_get_firmware_size )
+	[ $image_size -ge $firmware_size ] &&
+	{
+		echo "upgrade image is too big (${image_size}b > ${firmware_size}b)"
+	}
+
+	local vmlinux_blockoffset=$( platform_get_offset "$1" uImage )
+	[ -z $vmlinux_blockoffset ] && {
+		echo "vmlinux-uImage not found"
+		return 1
+	}
+
+	local rootfs_blockoffset=$( platform_get_offset "$1" rootfs "$vmlinux_blockoffset" )
+	[ -z $rootfs_blockoffset ] && {
+		echo "missing rootfs"
+		return 1
+	}
+
+	local data_blockoffset=$( platform_get_offset "$1" rootfs-data "$rootfs_blockoffset" )
+	[ -z $data_blockoffset ] && {
+		echo "rootfs doesn't have JFFS2 end marker"
+		return 1
+	}
+
+	return 0
+}
+
+platform_do_upgrade_all0258n() {
+	local firmware_base_addr=$( printf "%d" "$CI_FLADDR" )
+	local vmlinux_blockoffset=$( platform_get_offset "$1" uImage )
+	if [ ! -n "$vmlinux_blockoffset" ]; then
+		echo "can't determine uImage offset"
+		return 1
+	fi
+	local rootfs_blockoffset=$( platform_get_offset "$1" rootfs $(( $vmlinux_blockoffset + 1 )) )
+	local vmlinux_offset=$(( $vmlinux_blockoffset * $CI_BLKSZ ))
+	local vmlinux_addr=$(( $firmware_base_addr + $vmlinux_offset ))
+	local vmlinux_hexaddr=0x$( printf "%08x" "$vmlinux_addr" )
+	if [ ! -n "$rootfs_blockoffset" ]; then
+		echo "can't determine rootfs offset"
+		return 1
+	fi
+	local rootfs_offset=$(( $rootfs_blockoffset * $CI_BLKSZ ))
+	local rootfs_addr=$(( $firmware_base_addr + $rootfs_offset ))
+	local rootfs_hexaddr=0x$( printf "%08x" "$rootfs_addr" )
+	local vmlinux_blockcount=$(( $rootfs_blockoffset - $vmlinux_blockoffset ))
+	local vmlinux_size=$(( $rootfs_offset - $vmlinux_offset ))
+	local vmlinux_hexsize=0x$( printf "%08x" "$vmlinux_size" )
+	local data_blockoffset=$( platform_get_offset "$1" rootfs-data $(( $rootfs_blockoffset + 1 )) )
+	if [ ! -n "$data_blockoffset" ]; then
+		echo "can't determine rootfs size"
+		return 1
+	fi
+	local data_offset=$(( $data_blockoffset * $CI_BLKSZ ))
+	local rootfs_blockcount=$(( $data_blockoffset - $rootfs_blockoffset ))
+	local rootfs_size=$(( $data_offset - $rootfs_offset ))
+	local rootfs_hexsize=0x$( printf "%08x" "$rootfs_size" )
+
+	local rootfs_md5=$( dd if="$1" bs=$CI_BLKSZ skip=$rootfs_blockoffset count=$rootfs_blockcount 2>/dev/null | md5sum -); rootfs_md5="${rootfs_md5%% *}"
+	local vmlinux_md5=$( dd if="$1" bs=$CI_BLKSZ skip=$vmlinux_blockoffset count=$vmlinux_blockcount 2>/dev/null | md5sum -); vmlinux_md5="${vmlinux_md5%% *}"
+	# this needs a recent version of uboot-envtools!
+	cat >/tmp/fw_env_upgrade <<EOF
+vmlinux_start_addr $vmlinux_hexaddr
+vmlinux_size $vmlinux_hexsize
+vmlinux_checksum $vmlinux_md5
+rootfs_start_addr $rootfs_hexaddr
+rootfs_size $rootfs_hexsize
+rootfs_checksum $rootfs_md5
+bootcmd bootm $vmlinux_hexaddr
+EOF
+	fw_setenv -s /tmp/fw_env_upgrade || {
+		echo "failed to update U-Boot environment"
+		return 1
+	}
+	default_do_upgrade "$@"
+}

target/linux/ar71xx/base-files/lib/upgrade/platform.sh

@@ -69,6 +69,10 @@ platform_check_image() {
 	[ "$ARGC" -gt 1 ] && return 1
 
 	case "$board" in
+	all0258n )
+		platform_check_image_all0258n "$1" && return 0
+		return 1
+		;;
 	ap121 | ap121-mini | ap96 | db120 | zcn-1523h-2 | zcn-1523h-5)
 		[ "$magic_long" != "68737173" -a "$magic_long" != "19852003" ] && {
 			echo "Invalid image type."
@@ -141,6 +145,9 @@ platform_do_upgrade() {
 	routerstation | routerstation-pro | ls-sr71 | eap7660d | ja76pf )
 		platform_do_upgrade_combined "$ARGV"
 		;;
+	all0258n )
+		platform_do_upgrade_all0258n "$ARGV"
+		;;
 	*)
 		default_do_upgrade "$ARGV"
 		;;