Initial commit

Initial commit.

bootloader/mcuboot/scripts/assemble.py

@@ -0,0 +1,148 @@
+#! /usr/bin/env python3
+#
+# Copyright 2017 Linaro Limited
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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
+import os.path
+import pickle
+import sys
+
+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 find_board_name(bootdir):
+    dot_config = os.path.join(bootdir, "zephyr", ".config")
+    with open(dot_config, "r") as f:
+        for line in f:
+            if line.startswith("CONFIG_BOARD="):
+                return line.split("=", 1)[1].strip('"')
+    raise Exception("Expected CONFIG_BOARD line in {}".format(dot_config))
+
+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')
+    parser.add_argument('-z', '--zephyr-base',
+            help='Zephyr base containing the Zephyr repository')
+
+    args = parser.parse_args()
+
+    zephyr_base = args.zephyr_base
+    if zephyr_base is None:
+        try:
+            zephyr_base = os.environ['ZEPHYR_BASE']
+        except KeyError:
+            print('Need to either have ZEPHYR_BASE in environment or pass in -z')
+            sys.exit(1)
+
+    sys.path.insert(0, os.path.join(zephyr_base, "scripts", "dts", "python-devicetree", "src"))
+    import devicetree.edtlib
+
+    board = find_board_name(args.bootdir)
+
+    edt_pickle = os.path.join(args.bootdir, "zephyr", "edt.pickle")
+    with open(edt_pickle, 'rb') as f:
+        edt = pickle.load(f)
+        assert isinstance(edt, devicetree.edtlib.EDT)
+
+    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()