From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001
From: James <>
Date: Wed, 4 Nov 2015 11:49:21 +0000
Subject: trunk-47381

---
 scripts/combined-image.sh | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 scripts/combined-image.sh

(limited to 'scripts/combined-image.sh')

diff --git a/scripts/combined-image.sh b/scripts/combined-image.sh
new file mode 100644
index 0000000..5472b2c
--- /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" | 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"
+) > ${IMAGE} 2>/dev/null
+
+# Clean up.
+rm -f "$kern" "$root"
-- 
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