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Diffstat (limited to 'chip/ish/util/pack_ec.py')
| -rwxr-xr-x | chip/ish/util/pack_ec.py | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/chip/ish/util/pack_ec.py b/chip/ish/util/pack_ec.py new file mode 100755 index 0000000000..7cb659d86b --- /dev/null +++ b/chip/ish/util/pack_ec.py @@ -0,0 +1,61 @@ +#!/usr/bin/env python + +# Copyright 2019 The Chromium OS Authors. All rights reserved. +# Use of this source code is governed by a BSD-style license that can be +# found in the LICENSE file. + +# A script to pack EC binary with manifest header according to +# Based on 607297_Host_ISH_Firmware_Load_Chrome_OS_SAS_Rev0p5.pdf, +# https://chrome-internal.googlesource.com/chromeos/intel-ish/+/refs/heads/upstream/master/modules/api/ish_api/include/loader_common.h#211, +# and b/124788278#comment10 + +import argparse +import struct + +MANIFEST_ENTRY_SIZE = 0x80 +HEADER_SIZE = 0x1000 +PAGE_SIZE = 0x1000 + +def parseargs(): + parser = argparse.ArgumentParser() + parser.add_argument("-i", "--input", + help="EC binary to pack, usually ec.bin or ec.RO.flat.") + parser.add_argument("-o", "--output", + help="Output flash binary file") + parser.add_argument("--image_size", type=int, + help="Size of a single image") + + return parser.parse_args() + +def gen_manifest(ext_id, comp_app_name, code_offset, module_size): + """Returns a binary blob that represents a manifest entry""" + m = bytearray(MANIFEST_ENTRY_SIZE) + + # 4 bytes of ASCII encode ID (little endian) + struct.pack_into('<4s', m, 0, ext_id) + # 8 bytes of ASCII encode ID (little endian) + struct.pack_into('<8s', m, 32, comp_app_name) + # 4 bytes of code offset (little endian) + struct.pack_into('<I', m, 96, code_offset) + # 2 bytes of module in page size increments (little endian) + struct.pack_into('<H', m, 100, module_size / PAGE_SIZE) + + return m + +def main(): + args = parseargs() + + with open(args.output, 'wb') as f: + # Add manifest for main ISH binary + f.write(gen_manifest('ISHM', 'ISH_KERN', HEADER_SIZE, args.image_size)) + # Add manifest that signals end of manifests + f.write(gen_manifest('ISHE', '', 0, 0)) + # Pad the remaining HEADER with 0s + f.write('\x00' * (HEADER_SIZE - (MANIFEST_ENTRY_SIZE * 2))) + + # Append original image + with open(args.input, 'rb') as in_file: + f.write(in_file.read()) + +if __name__ == '__main__': + main()
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