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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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