[atheros] Implement a preliminary combined image format.

- add sysupgrade support for combined images by providing a platform.sh backend
 - use the mtd fis partition table rewrite facility to resize partitions on demand
 - generate generic combined images for the atheros target


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17668 3c298f89-4303-0410-b956-a3cf2f4a3e73

scripts/combined-image.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+BLKSZ=65536
+
+[ -f "$1" -a -f "$2" ] || {
+	echo "Usage: $0 <kernel image> <rootfs image> [output file]"
+	exit 1
+}
+
+# Make sure provided images are 64k aligned.
+kern=$(tempfile)
+root=$(tempfile)
+dd if="$1" of="$kern" bs=$BLKSZ conv=sync 2>/dev/null
+dd if="$2" of="$root" bs=$BLKSZ conv=sync 2>/dev/null
+
+# Calculate md5sum over combined kernel and rootfs image.
+md5=$(cat "$kern" "$root" | md5sum -)
+
+# Write image header followed by kernel and rootfs image.
+# The header is padded to 64k, format is:
+#  CI               magic word ("Combined Image")
+#  <kernel length>  length of kernel encoded as zero padded 8 digit hex
+#  <rootfs length>  length of rootfs encoded as zero padded 8 digit hex
+#  <md5sum>         checksum of the combined kernel and rootfs image
+( printf "CI%08x%08x%32s" \
+	$(stat -c "%s" "$kern") $(stat -c "%s" "$root") "${md5%% *}" | \
+	dd bs=$BLKSZ conv=sync;
+  cat "$kern" "$root"
+) > ${3:-openwrt-combined.img} 2>/dev/null
+
+# Clean up.
+rm -f "$kern" "$root"

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

@@ -0,0 +1,76 @@
+CI_BLKSZ=65536
+CI_LDADR=0x80041000
+
+platform_find_partitions() {
+	local first dev size erasesize name
+	while read dev size erasesize name; do
+		name=${name#'"'}; name=${name%'"'}
+		case "$name" in
+			vmlinux.bin.l7|kernel|linux|rootfs)
+				if [ -z "$first" ]; then
+					first="$name"
+				else
+					echo "$erasesize:$first:$name"
+					break
+				fi
+			;;
+		esac
+	done < /proc/mtd
+}
+
+platform_find_kernelpart() {
+	local part
+	for part in "${1%:*}" "${1#*:}"; do
+		case "$part" in
+			vmlinux.bin.l7|kernel|linux)
+				echo "$part"
+				break
+			;;
+		esac
+	done
+}
+
+platform_check_image() {
+	[ "$ARGC" -gt 1 ] && return 1
+
+	case "$(get_magic_word "$1")" in
+		# Combined Image
+		4349)
+			local md5_img=$(dd if="$1" bs=2 skip=9 count=16 2>/dev/null)
+			local md5_chk=$(dd if="$1" bs=$CI_BLKSZ skip=1 2>/dev/null | md5sum -); md5_chk="${md5_chk%% *}"
+
+			if [ -n "$md5_img" -a -n "$md5_chk" ] && [ "$md5_img" = "$md5_chk" ]; then
+				return 0
+			else
+				echo "Invalid image. Contents do not match checksum (image:$md5_img calculated:$md5_chk)"
+				return 1
+			fi
+		;;
+		*)
+			echo "Invalid image. Use combined .img files on this platform"
+			return 1
+		;;
+	esac
+}
+
+platform_do_upgrade() {
+	local partitions=$(platform_find_partitions)
+	local kernelpart=$(platform_find_kernelpart "${partitions#*:}")
+	local erase_size=$((0x${partitions%%:*})); partitions="${partitions#*:}"
+	local kern_length=0x$(dd if="$1" bs=2 skip=1 count=4 2>/dev/null)
+	local kern_blocks=$(($kern_length / $CI_BLKSZ))
+	local root_blocks=$((0x$(dd if="$1" bs=2 skip=5 count=4 2>/dev/null) / $CI_BLKSZ))
+
+	if [ -n "$partitions" ] && [ -n "$kernelpart" ] && \
+	   [ ${kern_blocks:-0} -gt 0 ] && \
+	   [ ${root_blocks:-0} -gt ${kern_blocks:-0} ] && \
+	   [ ${erase_size:-0} -gt 0 ];
+	then
+		local append=""
+		[ -f "$CONF_TAR" -a "$SAVE_CONFIG" -eq 1 ] && append="-j $CONF_TAR"
+
+		( dd if="$1" bs=$CI_BLKSZ skip=1 count=$kern_blocks 2>/dev/null; \
+		  dd if="$1" bs=$CI_BLKSZ skip=$((1+$kern_blocks)) count=$root_blocks 2>/dev/null ) | \
+			mtd -r $append -F$kernelpart:$kern_length:$CI_LDADR,rootfs write - $partitions
+	fi
+}

target/linux/atheros/image/Makefile

@@ -51,6 +51,12 @@ define Image/Build
 		-p0x150000:0x2a0000:::rootfs:$(BIN_DIR)/openwrt-$(BOARD)-root.$(1) \
 		$(BIN_DIR)/openwrt-$(BOARD)-wpe53g-$(1).bin
 
+  ifeq ($(BOARD),atheros)
+	-sh $(TOPDIR)/scripts/combined-image.sh \
+		"$(BIN_DIR)/openwrt-$(BOARD)-vmlinux.lzma" \
+		"$(BIN_DIR)/openwrt-$(BOARD)-root.$(1)" \
+		"$(BIN_DIR)/openwrt-$(BOARD)-combined.img"
+  endif
 endef
 
 $(eval $(call BuildImage))