ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/scripts/combined-image.sh b/scripts/combined-image.sh
new file mode 100755
index 0000000..a365fbc
--- /dev/null
+++ b/scripts/combined-image.sh
@@ -0,0 +1,34 @@
+#!/bin/sh
+
+BLKSZ=65536
+
+[ -f "$1" -a -f "$2" ] || {
+ echo "Usage: $0 <kernel image> <rootfs image> [output file]"
+ exit 1
+}
+
+IMAGE=${3:-openwrt-combined.img}
+
+# Make sure provided images are 64k aligned.
+kern="${IMAGE}.kernel"
+root="${IMAGE}.rootfs"
+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" | $MKHASH md5)
+
+# 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"
+) > ${IMAGE} 2>/dev/null
+
+# Clean up.
+rm -f "$kern" "$root"