115 lines
4.0 KiB
Python
Executable File
115 lines
4.0 KiB
Python
Executable File
#! /usr/bin/env python3
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#
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# Copyright 2017 Linaro Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Assemble multiple images into a single image that can be flashed on the device.
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"""
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import argparse
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import errno
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import io
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import re
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import os.path
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def same_keys(a, b):
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"""Determine if the dicts a and b have the same keys in them"""
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for ak in a.keys():
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if ak not in b:
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return False
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for bk in b.keys():
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if bk not in a:
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return False
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return True
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offset_re = re.compile(r"^#define DT_FLASH_AREA_([0-9A-Z_]+)_OFFSET(_0)?\s+(0x[0-9a-fA-F]+|[0-9]+)$")
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size_re = re.compile(r"^#define DT_FLASH_AREA_([0-9A-Z_]+)_SIZE(_0)?\s+(0x[0-9a-fA-F]+|[0-9]+)$")
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class Assembly():
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def __init__(self, output, bootdir):
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self.find_slots(bootdir)
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try:
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os.unlink(output)
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except OSError as e:
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if e.errno != errno.ENOENT:
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raise
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self.output = output
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def find_slots(self, bootdir):
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offsets = {}
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sizes = {}
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with open(os.path.join(bootdir, 'zephyr', 'include', 'generated', 'devicetree_legacy_unfixed.h'), 'r') as fd:
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for line in fd:
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m = offset_re.match(line)
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if m is not None:
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offsets[m.group(1)] = int(m.group(3), 0)
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m = size_re.match(line)
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if m is not None:
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sizes[m.group(1)] = int(m.group(3), 0)
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if not same_keys(offsets, sizes):
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raise Exception("Inconsistent data in devicetree.h")
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# We care about the MCUBOOT, IMAGE_0, and IMAGE_1 partitions.
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if 'MCUBOOT' not in offsets:
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raise Exception("Board partition table does not have mcuboot partition")
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if 'IMAGE_0' not in offsets:
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raise Exception("Board partition table does not have image-0 partition")
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if 'IMAGE_1' not in offsets:
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raise Exception("Board partition table does not have image-1 partition")
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self.offsets = offsets
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self.sizes = sizes
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def add_image(self, source, partition):
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with open(self.output, 'ab') as ofd:
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pos = ofd.tell()
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print("partition {}, pos={}, offset={}".format(partition, pos, self.offsets[partition]))
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if pos > self.offsets[partition]:
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raise Exception("Partitions not in order, unsupported")
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if pos < self.offsets[partition]:
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buf = b'\xFF' * (self.offsets[partition] - pos)
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ofd.write(buf)
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with open(source, 'rb') as rfd:
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ibuf = rfd.read()
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if len(ibuf) > self.sizes[partition]:
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raise Exception("Image {} is too large for partition".format(source))
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ofd.write(ibuf)
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument('-b', '--bootdir', required=True,
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help='Directory of built bootloader')
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parser.add_argument('-p', '--primary', required=True,
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help='Signed image file for primary image')
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parser.add_argument('-s', '--secondary',
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help='Signed image file for secondary image')
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parser.add_argument('-o', '--output', required=True,
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help='Filename to write full image to')
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args = parser.parse_args()
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output = Assembly(args.output, args.bootdir)
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output.add_image(os.path.join(args.bootdir, 'zephyr', 'zephyr.bin'), 'MCUBOOT')
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output.add_image(args.primary, "IMAGE_0")
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if args.secondary is not None:
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output.add_image(args.secondary, "IMAGE_1")
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if __name__ == '__main__':
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main()
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