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#!/usr/bin/env python3
#
# SPDX-License-Identifier: GPL-2.0-only
import struct
import sys
import hashlib
def read(path):
with open(path, 'rb') as f:
return f.read()
def write(path, data):
with open(path, 'wb') as f:
f.write(data)
def padding(data, size, pattern=b'\0'):
return data + pattern * (size - len(data))
def align(data, size, pattern=b'\0'):
return padding(data, (len(data) + (size - 1)) & ~(size - 1), pattern)
def gen_gfh_info(chip, data):
entries = {
'mt8173': 0x000C1000,
'mt8183': 0x00201000
}
gfh_format = '<44I'
gfh_size = struct.calcsize(gfh_format)
load_addr = entries[chip] - gfh_size
load_size = gfh_size + len(data) + hashlib.sha256().digest_size
gfh = struct.pack(gfh_format,
0x014d4d4d, 0x00000038, 0x454c4946, 0x464e495f,
0x0000004f, 0x00000001, 0x01050001, load_addr,
load_size, 0x00020000, 0x000000a8, 0x00000020,
0x000000B0, 0x00000001, 0x014d4d4d, 0x0001000c,
0x00000001, 0x034d4d4d, 0x00070064, 0x00001182,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00006400, 0x00001388,
0x00000000, 0x00000000, 0x00000000, 0x00000000)
return gfh
def gen_emmc_header(data):
header = (padding(struct.pack('<12sII', b'EMMC_BOOT', 1, 512), 512, b'\xff') +
padding(struct.pack('<8sIIIIIIII', b'BRLYT', 1, 2048, 2048 + len(data),
0x42424242, 0x00010005, 2048, 2048 + len(data), 1) + b'\0' * 140, 512,
b'\xff') +
b'\0' * 1024)
return header
def gen_sf_header(data):
header = (padding(struct.pack('<12sII', b'SF_BOOT', 1, 512), 512, b'\xff') +
padding(struct.pack('<8sIIIIIIII', b'BRLYT', 1, 2048, 2048 + len(data),
0x42424242, 0x00010007, 2048, 2048 + len(data), 1) + b'\0' * 140, 512,
b'\xff') +
b'\0' * 1024)
return header
gen_dev_header = {
'emmc': gen_emmc_header,
'sf': gen_sf_header
}
def gen_preloader(chip_ver, flash_type, data):
gfh_info = gen_gfh_info(chip_ver, data)
gfh_hash = hashlib.sha256(gfh_info + data).digest()
data = align(gfh_info + data + gfh_hash, 512, b'\xff')
header = gen_dev_header[flash_type](data)
return header + data
def main(argv):
if len(argv) != 5:
print('Usage: %s <chip> <flash_type> <input_file> <output_file>' % argv[0])
print('\t flash_type: emmc|sf')
print('\t chip : mt8173|mt8183')
exit(1)
write(argv[4], gen_preloader(argv[1], argv[2], read(argv[3])))
if __name__ == '__main__':
main(sys.argv)
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