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#!/usr/bin/env python3
#we can use binascii instead of zlib
import os, getopt, sys, zlib
from elftools.elf.elffile import ELFFile
def usage(exit_code):
print("typical usage:")
print("AXS101:")
print(sys.argv[0] + \
" --header-type v1 --arc-id 0x434 --spi-flash-offset 0x0 --image u-boot.bin --elf u-boot")
print("AXS103:")
print(sys.argv[0] + \
" --header-type v2 --arc-id 0x53 --spi-flash-offset 0x200000 --image u-boot.bin --elf u-boot")
sys.exit(exit_code)
def elf_get_entry(filename):
with open(filename, 'rb') as f:
elffile = ELFFile(f)
return elffile.header['e_entry']
def calc_check_sum(filename):
# Calculate u-boot image check_sum: it is sum of all u-boot binary bytes
with open(filename, "rb") as file:
ba = bytearray(file.read())
return sum(ba) & 0xFF
def arg_verify(uboot_bin_filename, uboot_elf_filename, header_type):
if not os.path.isfile(uboot_bin_filename):
print("uboot bin file not exists: " + uboot_bin_filename)
sys.exit(2)
if not os.path.isfile(uboot_elf_filename):
print("uboot elf file not exists: " + uboot_elf_filename)
sys.exit(2)
if header_type not in ("v1", "v2"):
print("unknown header type: " + header_type)
print("choose between 'v1' (most likely AXS101) and 'v2' (most likely AXS103)")
sys.exit(2)
def main():
try:
opts, args = getopt.getopt(sys.argv[1:],
"ht:a:s:i:l:e:",
["help", "header-type=", "arc-id=", "spi-flash-offset=", "image=", "elf="])
except getopt.GetoptError as err:
print(err)
usage(2)
# default filenames
uboot_elf_filename = "u-boot"
uboot_bin_filename = "u-boot.bin"
headerised_filename = "u-boot.head"
uboot_scrypt_file = "u-boot-update.txt"
# default values
spi_flash_offset = 0x200000
header_type = "v2"
arc_id = 0x53
# initial header values: place where preloader will store u-boot binary,
# should be equal to CONFIG_SYS_TEXT_BASE
image_copy_adr = 0x81000000
# initial constant header values, do not change these values
magic1 = 0xdeadbeafaf # big endian byte order
magic2 = [ # big endian byte order
0x20202a2020202020202020202a20202020207c5c2e20202020202e2f7c20202020207c2d,
0x2e5c2020202f2e2d7c20202020205c2020602d2d2d6020202f20202020202f205f202020,
0x205f20205c20202020207c205f60712070205f207c2020202020272e5f3d2f205c3d5f2e,
0x272020202020202020605c202f60202020202020202020202020206f2020202020202020]
for opt, arg in opts:
if opt in ('-h', "--help"): usage(0)
if opt in ('-t', "--header-type"): header_type = arg
if opt in ('-a', "--arc-id"): arc_id = int(arg, 16)
if opt in ('-s', "--spi-flash-offset"): spi_flash_offset = int(arg, 16)
if opt in ('-i', "--image"): uboot_bin_filename = arg
if opt in ('-e', "--elf"): uboot_elf_filename = arg
arg_verify(uboot_bin_filename, uboot_elf_filename, header_type)
uboot_img_size = os.path.getsize(uboot_bin_filename)
jump_address = elf_get_entry(uboot_elf_filename)
check_sum = calc_check_sum(uboot_bin_filename)
# Calculate header adresses depend on header type
if header_type == "v2":
image_copy_adr -= 0x4
uboot_img_size += 0x4
# we append image so we need to append checksum
jmpchk_sum = sum(jump_address.to_bytes(4, byteorder='big'))
check_sum = (check_sum + jmpchk_sum) & 0xFF
imade_jump_append = True
else:
imade_jump_append = False
# write header to file
with open(headerised_filename, "wb") as file:
file.write(arc_id.to_bytes(2, byteorder='little'))
file.write(uboot_img_size.to_bytes(4, byteorder='little'))
file.write(check_sum.to_bytes(1, byteorder='little'))
file.write(image_copy_adr.to_bytes(4, byteorder='little'))
file.write(magic1.to_bytes(5, byteorder='big'))
for i in range(16): file.write(0x00.to_bytes(1, byteorder='little'))
for byte in magic2: file.write(byte.to_bytes(36, byteorder='big'))
for i in range(224 - len(magic2) * 36):
file.write(0x00.to_bytes(1, byteorder='little'))
if imade_jump_append:
file.write(jump_address.to_bytes(4, byteorder='little'))
# append u-boot image to header
with open(headerised_filename, "ab") as fo:
with open(uboot_bin_filename,'rb') as fi:
fo.write(fi.read())
# calc u-boot headerised image CRC32 (will be used by uboot update
# command for check)
headerised_image_crc = ""
with open(headerised_filename, "rb") as fi:
headerised_image_crc = hex(zlib.crc32(fi.read()) & 0xffffffff)
load_addr = 0x81000000
crc_store_adr = load_addr - 0x8
crc_calc_adr = crc_store_adr - 0x4
load_size = os.path.getsize(headerised_filename)
crc_calc_cmd = \
"crc32 " + hex(load_addr) + " " + hex(load_size) + " " + hex(crc_calc_adr)
crc_check_cmd = \
"mw.l " + hex(crc_store_adr) + " " + headerised_image_crc + " && " + \
crc_calc_cmd + " && " + \
"cmp.l " + hex(crc_store_adr) + " " + hex(crc_calc_adr) + " 1"
# make errase size to be allighned by 64K
if load_size & 0xFFFF == 0:
errase_size = load_size
else:
errase_size = load_size - (load_size & 0xFFFF) + 0x10000
# Hack to handle n25*** flash protect ops weirdness:
# protect unlock return fail status is region is already unlock (entire or
# partially). Same for lock ops.
# As there is no possibility to check current flash status pretend
# unlock & lock always success.
sf_unlock_cmd = \
"if sf protect unlock 0x0 0x4000000 ; then true ; else true ; fi"
sf_lock_cmd = \
"if sf protect lock 0x0 0x4000000 ; then true ; else true ; fi"
# u-bood CMD to load u-bood with header to SPI flash
sf_load_image_cmd = \
"fatload mmc 0:1 " + hex(load_addr) + " " + headerised_filename + " && " + \
"sf probe 0:0 && " + \
sf_unlock_cmd + " && " + \
"sf erase " + hex(spi_flash_offset) + " " + hex(errase_size) + " && " + \
"sf write " + hex(load_addr) + " " + hex(spi_flash_offset) + " " + hex(load_size) + " && " + \
sf_lock_cmd
update_uboot_cmd = sf_load_image_cmd + " && echo \"u-boot update: OK\""
with open(uboot_scrypt_file, "wb") as fo:
fo.write(update_uboot_cmd.encode('ascii'))
if __name__ == "__main__":
try:
main()
except Exception as err:
print(err)
sys.exit(2)
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