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#!/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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