mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2024-12-27 00:52:36 +00:00
35 lines
1020 B
Bash
35 lines
1020 B
Bash
#!/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"
|