+#!/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 name -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 ==> human friendly Device Tree Blob 'name'"
+ echo -e "\t-d ==> include Device Tree Blob 'dtb'"
+ echo -e "\t-o ==> create output file 'its_file'"
+ exit 1
+}
+
+while getopts ":A:a:C:D:d:e:k:o:v:" OPTION
+do
+ case $OPTION in
+ A ) ARCH=$OPTARG;;
+ a ) LOAD_ADDR=$OPTARG;;
+ C ) COMPRESS=$OPTARG;;
+ D ) DEVICE=$OPTARG;;
+ d ) DTB=$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
+
+ARCH_UPPER=`echo $ARCH | tr '[:lower:]' '[:upper:]'`
+
+# Create a default, fully populated DTS file
+DATA="/dts-v1/;
+
+/ {
+ description = \"${ARCH_UPPER} OpenWrt FIT (Flattened Image Tree)\";
+ #address-cells = <1>;
+
+ images {
+ kernel@1 {
+ description = \"${ARCH_UPPER} OpenWrt Linux-${VERSION}\";
+ data = /incbin/(\"${KERNEL}\");
+ type = \"kernel\";
+ arch = \"${ARCH}\";
+ os = \"linux\";
+ compression = \"${COMPRESS}\";
+ load = <${LOAD_ADDR}>;
+ entry = <${ENTRY_ADDR}>;
+ hash@1 {
+ algo = \"crc32\";
+ };
+ hash@2 {
+ algo = \"sha1\";
+ };
+ };
+
+ fdt@1 {
+ description = \"${ARCH_UPPER} OpenWrt ${DEVICE} device tree blob\";
+ data = /incbin/(\"${DTB}\");
+ type = \"flat_dt\";
+ arch = \"${ARCH}\";
+ compression = \"none\";
+ hash@1 {
+ algo = \"crc32\";
+ };
+ hash@2 {
+ algo = \"sha1\";
+ };
+ };
+ };
+
+ configurations {
+ default = \"config@1\";
+ config@1 {
+ description = \"OpenWrt\";
+ kernel = \"kernel@1\";
+ fdt = \"fdt@1\";
+ };
+ };
+};"
+
+# Conditionally strip fdt information out of tree
+if [ -z "${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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