import os import binascii def _generate_data_bytes(boarduuid, mac0, mac1): data = bytearray() data += (2029785358).to_bytes(4, 'big') # magicid --> 0x78FC110E data += bytearray([0, 0, 0, 0]) # crc32 = 0 data += bytearray(boarduuid + "\0", 'ascii') # uuid --> 'c0846c8a-5fa5-11ea-8576-f8b156ac62d7' and \0 at the end data += binascii.unhexlify(mac0.replace(':', '')) # mac0 --> 'f8:b1:56:ac:62:d7' if mac1 is not None: data += binascii.unhexlify(mac1.replace(':', '')) # mac1 --> 'f8:b1:56:ac:62:d7' else: data += bytearray([0, 0, 0, 0, 0, 0]) # mac1 --> 0:0:0:0:0:0 # calculate crc crc = (binascii.crc32(data, 0)).to_bytes(4, 'big') data[4:8] = crc return data def _generate_output_data(data_rx): boarduuid = data_rx[8:45].decode mac0 = binascii.hexlify(data_rx[45:53]).decode() mac1 = binascii.hexlify(data_rx[53:61]).decode() smac0 = '-'.join(mac0[i:i + 2] for i in range(0, len(mac0), 2)) smac1 = '-'.join(mac1[i:i + 2] for i in range(0, len(mac1), 2)) eepromdata = "UUID :" + boarduuid + " MAC0:" + smac0 + " MAC1:" + smac1 return eepromdata # returns exitcode and data saved into eeprom def flash_eeprom(eeprompath, boarduuid, mac0, mac1=None): print("Start programming Eeprom...") # check if eeprompath is correct if os.path.isfile(eeprompath): # create u-boot data struct data = _generate_data_bytes(boarduuid, mac0, mac1) # write into eeprom and read back f = open(eeprompath, "r+b") f.write(data) f.seek(0) data_rx = f.read(57) for i in range(57): if data_rx[i] != data[i]: print("Error while programming eeprom memory.") return 1, None print("Eeprom programmed succesfully.") # generated eeprom read data eepromdata = _generate_output_data(data_rx) return 0, eepromdata else: print("Eeprom memory not found.") return 1, None