mirror of
https://github.com/eried/portapack-mayhem.git
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105 lines
3.2 KiB
Python
Executable File
105 lines
3.2 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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# Copyright (C) 2024 Mark Thompson
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#
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# This file is part of PortaPack.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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import sys
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from external_app_info import maximum_application_size
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from external_app_info import external_apps_address_start
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from external_app_info import external_apps_address_end
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usage_message = """
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PortaPack SPI flash image generator
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Usage: <command> <application_path> <baseband_path> <output_path>
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Where paths refer to the .bin files for each component project.
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"""
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def read_image(path):
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f = open(path, 'rb')
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data = f.read()
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f.close()
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return data
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def write_image(data, path):
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f = open(path, 'wb')
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f.write(data)
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f.close()
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if len(sys.argv) != 4:
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print(usage_message)
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sys.exit(-1)
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application_image = read_image(sys.argv[1])
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baseband_image = read_image(sys.argv[2])
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output_path = sys.argv[3]
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spi_size = 1048576
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images = (
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{
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'name': 'application',
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'data': application_image,
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'size': len(application_image),
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},
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{
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'name': 'baseband',
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'data': baseband_image,
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'size': len(baseband_image),
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},
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)
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spi_image = bytearray()
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spi_image_default_byte = bytearray((255,))
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for image in images:
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if len(image['data']) > image['size']:
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raise RuntimeError('data for image "%(name)s" is longer than 0x%(size)x bytes 0x%(sz)x' % {'name':image['name'], 'size':image['size'], 'sz':len(image['data'])})
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pad_size = image['size'] - len(image['data'])
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padded_data = image['data'] + (spi_image_default_byte * pad_size)
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spi_image += padded_data
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if len(spi_image) > spi_size - 4:
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raise RuntimeError('SPI flash image size of %d exceeds device size of %d bytes' % (len(spi_image) + 4, spi_size))
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pad_size = spi_size - 4 - len(spi_image)
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for i in range(pad_size):
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spi_image += spi_image_default_byte
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# quick "add up the words" checksum, and check for possible references to code in external apps
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checksum = 0
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for i in range(0, len(spi_image), 4):
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snippet = spi_image[i:i+4]
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val = int.from_bytes(snippet, byteorder='little')
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checksum += val
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if (val >= external_apps_address_start) and (val < external_apps_address_end) and ((val & 0xFFFF) < maximum_application_size):
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print ("WARNING: Possible external code address", hex(val), "at offset", hex(i), "in", sys.argv[3])
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final_checksum = 0
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checksum = (final_checksum - checksum) & 0xFFFFFFFF
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spi_image += checksum.to_bytes(4, 'little')
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write_image(spi_image, output_path)
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percent_remaining = round(1000 * pad_size / spi_size) / 10;
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print ("Space remaining in flash ROM:", pad_size, "bytes (", percent_remaining, "%)") |