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#! /usr/bin/env python3
#
# Copyright 2017 Linaro Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Assemble multiple images into a single image that can be flashed on the device.
"""
import argparse
import errno
import io
import re
import os.path
import sys
ZEPHYR_BASE = os.getenv("ZEPHYR_BASE")
if not ZEPHYR_BASE:
sys.exit("$ZEPHYR_BASE environment variable undefined")
sys.path.insert(0, os.path.join(ZEPHYR_BASE, "scripts", "dts"))
import edtlib
def same_keys(a, b):
"""Determine if the dicts a and b have the same keys in them"""
for ak in a.keys():
if ak not in b:
return False
for bk in b.keys():
if bk not in a:
return False
return True
offset_re = re.compile(r"^#define DT_FLASH_AREA_([0-9A-Z_]+)_OFFSET(_0)?\s+(0x[0-9a-fA-F]+|[0-9]+)$")
size_re = re.compile(r"^#define DT_FLASH_AREA_([0-9A-Z_]+)_SIZE(_0)?\s+(0x[0-9a-fA-F]+|[0-9]+)$")
class Assembly():
def __init__(self, output, bootdir, edt):
self.find_slots(edt)
try:
os.unlink(output)
except OSError as e:
if e.errno != errno.ENOENT:
raise
self.output = output
def find_slots(self, edt):
offsets = {}
sizes = {}
part_nodes = edt.compat2nodes["fixed-partitions"]
for node in part_nodes:
for child in node.children.values():
if "label" in child.props:
label = child.props["label"].val
offsets[label] = child.regs[0].addr
sizes[label] = child.regs[0].size
if not same_keys(offsets, sizes):
raise Exception("Inconsistent data in devicetree.h")
# We care about the mcuboot, image-0, and image-1 partitions.
if 'mcuboot' not in offsets:
raise Exception("Board partition table does not have mcuboot partition")
if 'image-0' not in offsets:
raise Exception("Board partition table does not have image-0 partition")
if 'image-1' not in offsets:
raise Exception("Board partition table does not have image-1 partition")
self.offsets = offsets
self.sizes = sizes
def add_image(self, source, partition):
with open(self.output, 'ab') as ofd:
pos = ofd.tell()
print("partition {}, pos={}, offset={}".format(partition, pos, self.offsets[partition]))
if pos > self.offsets[partition]:
raise Exception("Partitions not in order, unsupported")
if pos < self.offsets[partition]:
buf = b'\xFF' * (self.offsets[partition] - pos)
ofd.write(buf)
with open(source, 'rb') as rfd:
ibuf = rfd.read()
if len(ibuf) > self.sizes[partition]:
raise Exception("Image {} is too large for partition".format(source))
ofd.write(ibuf)
def main():
parser = argparse.ArgumentParser()
parser.add_argument('-b', '--bootdir', required=True,
help='Directory of built bootloader')
parser.add_argument('-p', '--primary', required=True,
help='Signed image file for primary image')
parser.add_argument('-s', '--secondary',
help='Signed image file for secondary image')
parser.add_argument('-o', '--output', required=True,
help='Filename to write full image to')
args = parser.parse_args()
# Extract board name from path
board = os.path.split(os.path.split(args.bootdir)[0])[1]
dts_path = os.path.join(args.bootdir, "zephyr", board + ".dts.pre.tmp")
edt = edtlib.EDT(dts_path, [os.path.join(ZEPHYR_BASE, "dts", "bindings")],
warn_reg_unit_address_mismatch=False)
output = Assembly(args.output, args.bootdir, edt)
output.add_image(os.path.join(args.bootdir, 'zephyr', 'zephyr.bin'), 'mcuboot')
output.add_image(args.primary, "image-0")
if args.secondary is not None:
output.add_image(args.secondary, "image-1")
if __name__ == '__main__':
main()
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