149 lines
5.1 KiB
Python
Executable File
149 lines
5.1 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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# SPDX-License-Identifier: Apache-2.0
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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
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import os.path
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import pickle
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import sys
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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, edt):
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self.find_slots(edt)
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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, edt):
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offsets = {}
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sizes = {}
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part_nodes = edt.compat2nodes["fixed-partitions"]
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for node in part_nodes:
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for child in node.children.values():
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if "label" in child.props:
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label = child.props["label"].val
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offsets[label] = child.regs[0].addr
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sizes[label] = child.regs[0].size
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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 find_board_name(bootdir):
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dot_config = os.path.join(bootdir, "zephyr", ".config")
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with open(dot_config, "r") as f:
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for line in f:
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if line.startswith("CONFIG_BOARD="):
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return line.split("=", 1)[1].strip('"')
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raise Exception("Expected CONFIG_BOARD line in {}".format(dot_config))
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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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parser.add_argument('-z', '--zephyr-base',
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help='Zephyr base containing the Zephyr repository')
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args = parser.parse_args()
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zephyr_base = args.zephyr_base
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if zephyr_base is None:
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try:
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zephyr_base = os.environ['ZEPHYR_BASE']
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except KeyError:
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print('Need to either have ZEPHYR_BASE in environment or pass in -z')
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sys.exit(1)
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sys.path.insert(0, os.path.join(zephyr_base, "scripts", "dts", "python-devicetree", "src"))
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import devicetree.edtlib
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board = find_board_name(args.bootdir)
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edt_pickle = os.path.join(args.bootdir, "zephyr", "edt.pickle")
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with open(edt_pickle, 'rb') as f:
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edt = pickle.load(f)
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assert isinstance(edt, devicetree.edtlib.EDT)
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output = Assembly(args.output, args.bootdir, edt)
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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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