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#!/bin/bash
#
# Licensed under the terms of the GNU GPL License version 2 or later.
#
# Author: Peter Tyser <ptyser@xes-inc.com>
#
# U-Boot firmware supports the booting of images in the Flattened Image
# Tree (FIT) format. The FIT format uses a device tree structure to
# describe a kernel image, device tree blob, ramdisk, etc. This script
# creates an Image Tree Source (.its file) which can be passed to the
# 'mkimage' utility to generate an Image Tree Blob (.itb file). The .itb
# file can then be booted by U-Boot (or other bootloaders which support
# FIT images). See doc/uImage.FIT/howto.txt in U-Boot source code for
# additional information on FIT images.
#
usage() {
echo "Usage: `basename $0` -A arch -C comp -a addr -e entry" \
"-v version -k kernel [-d dtb] -o its_file"
echo -e "\t-A ==> set architecture to 'arch'"
echo -e "\t-C ==> set compression type 'comp'"
echo -e "\t-a ==> set load address to 'addr' (hex)"
echo -e "\t-e ==> set entry point to 'entry' (hex)"
echo -e "\t-v ==> set kernel version to 'version'"
echo -e "\t-k ==> include kernel image 'kernel'"
echo -e "\t-d ==> include Device Tree Blob 'dtb'"
echo -e "\t-o ==> create output file 'its_file'"
exit 1
}
while getopts ":A:C:a:d:e:k:o:v:" OPTION
do
case $OPTION in
A ) ARCH=$OPTARG;;
C ) COMPRESS=$OPTARG;;
a ) LOAD_ADDR=$OPTARG;;
d ) DTB=$OPTARG;;
e ) ENTRY_ADDR=$OPTARG;;
k ) KERNEL=$OPTARG;;
o ) OUTPUT=$OPTARG;;
v ) VERSION=$OPTARG;;
* ) echo "Invalid option passed to '$0' (options:$@)"
usage;;
esac
done
# Make sure user entered all required parameters
if [ -z "${ARCH}" ] || [ -z "${COMPRESS}" ] || [ -z "${LOAD_ADDR}" ] || \
[ -z "${ENTRY_ADDR}" ] || [ -z "${VERSION}" ] || [ -z "${KERNEL}" ] || \
[ -z "${OUTPUT}" ]; then
usage
fi
# Create a default, fully populated DTS file
DATA="/dts-v1/;
/ {
description = \"Linux kernel ${VERSION}\";
#address-cells = <1>;
images {
kernel@1 {
description = \"Linux Kernel ${VERSION}\";
data = /incbin/(\"${KERNEL}\");
type = \"kernel\";
arch = \"${ARCH}\";
os = \"linux\";
compression = \"${COMPRESS}\";
load = <${LOAD_ADDR}>;
entry = <${ENTRY_ADDR}>;
hash@1 {
algo = \"crc32\";
};
hash@2 {
algo = \"sha1\";
};
};
fdt@1 { /* start fdt */
description = \"Flattened Device Tree blob\";
data = /incbin/(\"${DTB}\");
type = \"flat_dt\";
arch = \"${ARCH}\";
compression = \"none\";
hash@1 {
algo = \"crc32\";
};
hash@2 {
algo = \"sha1\";
};
}; /* end fdt */
};
configurations {
default = \"config@1\";
config@1 {
description = \"Default Linux kernel\";
kernel = \"kernel@1\";
fdt = \"fdt@1\";
};
};
};"
# Conditionally strip fdt information out of tree
if [ -z "${DTB}" ]; then
DATA=`echo "$DATA" | sed '/start fdt/,/end fdt/d'`
DATA=`echo "$DATA" | sed '/fdt/d'`
fi
# Write .its file to disk
echo "$DATA" > ${OUTPUT}
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