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authorJo-Philipp Wich <jow@openwrt.org>2009-09-22 01:09:04 +0000
committerJo-Philipp Wich <jow@openwrt.org>2009-09-22 01:09:04 +0000
commitf20af3832204ca2c35a9f1da208a34d2a509996c (patch)
tree86d860c62728686a3eda58e7f7de3b75c5127f48 /scripts/combined-image.sh
parent5b027739405dc0f0dcee3588a17df19cae11eda9 (diff)
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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
SVN-Revision: 17668
Diffstat (limited to 'scripts/combined-image.sh')
-rw-r--r--scripts/combined-image.sh32
1 files changed, 32 insertions, 0 deletions
diff --git a/scripts/combined-image.sh b/scripts/combined-image.sh
new file mode 100644
index 0000000000..eecd3d7f20
--- /dev/null
+++ b/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"