Viewing file:  add_capsule_header.py (2.46 KB) -rwxr-xr-x
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#!/usr/bin/python3
#
# Copyright (C) 2019 Richard Hughes <[email protected]>
#
# SPDX-License-Identifier: LGPL-2.1+
import sys
import uuid
import argparse
import ctypes
CAPSULE_FLAGS_PERSIST_ACROSS_RESET = 0x00010000
CAPSULE_FLAGS_POPULATE_SYSTEM_TABLE = 0x00020000
CAPSULE_FLAGS_INITIATE_RESET = 0x00040000
def add_header(infile, outfile, gd, fl=None):
# parse GUID from command line
try:
guid = uuid.UUID(gd)
except ValueError as e:
print(e)
return 1
import struct
try:
with open(infile, "rb") as f:
bin_data = f.read()
except FileNotFoundError as e:
print(e)
return 1
# check if already has header
hdrsz = struct.calcsize("<16sIII")
if len(bin_data) >= hdrsz:
hdr = struct.unpack("<16sIII", bin_data[:hdrsz])
imgsz = hdr[3]
if imgsz == len(bin_data):
print("Replacing existing CAPSULE_HEADER of:")
guid_mixed = uuid.UUID(bytes_le=hdr[0])
hdrsz_old = hdr[1]
flags = hdr[2]
print("GUID: %s" % guid_mixed)
print("HdrSz: 0x%04x" % hdrsz_old)
print("Flags: 0x%04x" % flags)
print("PayloadSz: 0x%04x" % imgsz)
bin_data = bin_data[hdrsz_old:]
# set header flags
flags = (
CAPSULE_FLAGS_PERSIST_ACROSS_RESET
| CAPSULE_FLAGS_INITIATE_RESET
| CAPSULE_FLAGS_POPULATE_SYSTEM_TABLE
)
if fl:
flags = int(fl, 16)
# build update capsule header
hdrsz = 4096
imgsz = hdrsz + len(bin_data)
hdr = ctypes.create_string_buffer(hdrsz)
struct.pack_into("<16sIII", hdr, 0, guid.bytes_le, hdrsz, flags, imgsz)
with open(outfile, "wb") as f:
f.write(hdr)
f.write(bin_data)
print("Wrote capsule %s" % outfile)
print("GUID: %s" % guid)
print("HdrSz: 0x%04x" % hdrsz)
print("Flags: 0x%04x" % flags)
print("PayloadSz: 0x%04x" % imgsz)
return 0
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Add capsule header on firmware")
parser.add_argument("--guid", help="GUID of the device", required=True)
parser.add_argument("--bin", help="Path to the .bin file", required=True)
parser.add_argument("--cap", help="Output capsule file path", required=True)
parser.add_argument("--flags", help="Flags, e.g. 0x40000", default=None)
args = parser.parse_args()
sys.exit(add_header(args.bin, args.cap, args.guid, args.flags))
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