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#!/usr/bin/env python3
#
# SPDX-License-Identifier: BSD-3-Clause
import os
import struct
import sys
PROG_NAME = os.path.basename(sys.argv[0])
def create_header(base, size):
"""Returns a packed MBN header image with the specified base and size.
@arg base: integer, specifies the image load address in RAM
@arg size: integer, specifies the size of the image
@returns: string, the MBN header
"""
# SBLs require size to be 4 bytes aligned.
size = (size + 3) & 0xfffffffc
# We currently do not support appending certificates. Signing GPL
# code might violate the GPL. So U-Boot will never be signed. So
# this is not required for U-Boot.
header = [
0x5, # Type: APPSBL
0x3, # Version: 3
0x0, # Image source pointer
base, # Image destination pointer
size, # Code Size + Cert Size + Signature Size
size, # Code Size
base + size, # Destination + Code Size
0x0, # Signature Size
base + size, # Destination + Code Size + Signature Size
0x0, # Cert Size
]
header_packed = struct.pack('<10I', *header)
return header_packed
def mkheader(base_addr, infname, outfname):
"""Prepends the image with the MBN header.
@arg base_addr: integer, specifies the image load address in RAM
@arg infname: string, image filename
@arg outfname: string, output image with header prepended
@raises IOError: if reading/writing input/output file fails
"""
with open(infname, "rb") as infp:
image = infp.read()
insize = len(image)
if base_addr > 0xFFFFFFFF:
raise ValueError("invalid base address")
if base_addr + insize > 0xFFFFFFFF:
raise ValueError("invalid destination range")
header = create_header(base_addr, insize)
with open(outfname, "wb") as outfp:
outfp.write(header)
outfp.write(image)
def usage(msg=None):
"""Print command usage.
@arg msg: string, error message if any (default: None)
"""
if msg != None:
sys.stderr.write("%s: %s\n" % (PROG_NAME, msg))
print("Usage: %s <base-addr> <input-file> <output-file>" % PROG_NAME)
if msg != None:
exit(1)
def main():
"""Main entry function"""
if len(sys.argv) != 4:
usage("incorrect number of arguments")
try:
base_addr = int(sys.argv[1], 0)
infname = sys.argv[2]
outfname = sys.argv[3]
except ValueError as e:
sys.stderr.write("mkheader: invalid base address '%s'\n" % sys.argv[1])
exit(1)
try:
mkheader(base_addr, infname, outfname)
except IOError as e:
sys.stderr.write("%s: %s\n" % (PROG_NAME, e))
exit(1)
except ValueError as e:
sys.stderr.write("%s: %s\n" % (PROG_NAME, e))
exit(1)
if __name__ == "__main__":
main()
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