How to use the esptool.FatalError function in esptool

if offset >= num_bytes:
        raise RuntimeError("Invalid offset: Key block only holds %d bytes." % num_bytes)
    if len(data) > num_bytes - offset:
        raise RuntimeError("Data will not fit: Key block size %d bytes, data file is %d bytes" % (num_bytes, len(data)))
    if efuses.coding_scheme == CODING_SCHEME_34:
        if offset % 6 != 0:
            raise RuntimeError("Device has 3/4 Coding Scheme. Can only write at offsets which are a multiple of 6.")
        if len(data) % 6 != 0:
            raise RuntimeError("Device has 3/4 Coding Scheme. Can only write data lengths which are a multiple of 6 (data is %d bytes)" % len(data))

    efuse = [e for e in efuses if e.register_name == args.block.upper()][0]

    if not args.force_write_always and \
       efuse.get_raw() != b'\x00' * num_bytes:
        raise esptool.FatalError("Efuse block already has values written.")

    if efuses.coding_scheme == CODING_SCHEME_NONE:
        pad = offset % 4
        if pad != 0:  # left-pad to a word boundary
            data = (b'\x00' * pad) + data
            offset -= pad
        pad = len(data) % 4
        if pad != 0:  # right-pad to a word boundary
            data += (b'\x00' * (4 - pad))
        words = struct.unpack("<" + "I" * (len(data) // 4), data)
        word_offset = offset // 4
    else:  # CODING_SCHEME_34
        words = efuse.apply_34_encoding(data)
        word_offset = (offset // 6) * 2

    confirm("Burning efuse %s (%s) with %d bytes of data at offset %d in the block" % (efuse.register_name, efuse.description, len(data), offset), args)

def check_command(self, op_description, op=None, data=b'', chk=0, timeout=DEFAULT_TIMEOUT):
        """
        Execute a command with 'command', check the result code and throw an appropriate
        FatalError if it fails.

        Returns the "result" of a successful command.
        """
        val, data = self.command(op, data, chk, timeout=timeout)

        # things are a bit weird here, bear with us

        # the status bytes are the last 2/4 bytes in the data (depending on chip)
        if len(data) < self.STATUS_BYTES_LENGTH:
            raise FatalError("Failed to %s. Only got %d byte status response." % (op_description, len(data)))
        status_bytes = data[-self.STATUS_BYTES_LENGTH:]
        # we only care if the first one is non-zero. If it is, the second byte is a reason.
        if byte(status_bytes, 0) != 0:
            raise FatalError.WithResult('Failed to %s' % op_description, status_bytes)

        # if we had more data than just the status bytes, return it as the result
        # (this is used by the md5sum command, maybe other commands?)
        if len(data) > self.STATUS_BYTES_LENGTH:
            return data[:-self.STATUS_BYTES_LENGTH]
        else:  # otherwise, just return the 'val' field which comes from the reply header (this is used by read_reg)
            return val

def erase_region(self, offset, size):
        if offset % self.FLASH_SECTOR_SIZE != 0:
            raise FatalError("Offset to erase from must be a multiple of 4096")
        if size % self.FLASH_SECTOR_SIZE != 0:
            raise FatalError("Size of data to erase must be a multiple of 4096")
        timeout = timeout_per_mb(ERASE_REGION_TIMEOUT_PER_MB, size)
        self.check_command("erase region", self.ESP_ERASE_REGION, struct.pack('

def wait_idle():
            deadline = time.time() + EFUSE_BURN_TIMEOUT
            while time.time() < deadline:
                if self._esp.read_reg(EFUSE_REG_CMD) == 0:
                    return
            raise esptool.FatalError("Timed out waiting for Efuse controller command to complete")
        wait_idle()

def disable_read(self):
        if self.read_disable_bit is None:
            raise esptool.FatalError("This efuse cannot be read-disabled")
        rddis_reg_addr = efuse_write_reg_addr(0, 0)
        self.parent.write_reg(rddis_reg_addr, 1 << (16 + self.read_disable_bit))
        self.parent.write_efuses()
        return self.get()

def wait_idle():
            deadline = time.time() + EFUSE_BURN_TIMEOUT
            while time.time() < deadline:
                if self._esp.read_reg(EFUSE_REG_CMD) == 0:
                    return
            raise esptool.FatalError("Timed out waiting for Efuse controller command to complete")
        wait_idle()

def burn(self, new_value):
        # Writing the BLK0 default MAC is not sensible, as it's written in the factory.
        #
        # TODO: support writing a new base MAC @ efuse BLK3
        raise esptool.FatalError("Writing MAC address is not supported")

def _load_hardware_key(keyfile):
    """ Load a 256-bit key, similar to stored in efuse, from a file

    192-bit keys will be extended to 256-bit using the same algorithm used
    by hardware if 3/4 Coding Scheme is set.
    """
    key = keyfile.read()
    if len(key) not in [24, 32]:
        raise esptool.FatalError("Key file contains wrong length (%d bytes), 24 or 32 expected." % len(key))
    if len(key) == 24:
        key = key + key[8:16]
        print("Using 192-bit key (extended)")
    else:
        print("Using 256-bit key")

    assert len(key) == 32
    return key

def burn_efuse(esp, efuses, args):
    efuse = efuses[args.efuse_name]
    old_value = efuse.get()
    if efuse.efuse_type == "flag":
        if args.new_value not in [None, 1]:
            raise esptool.FatalError("Efuse %s is type 'flag'. New value is not accepted for this efuse (will always burn 0->1)" % efuse.register_name)
        args.new_value = 1
        if old_value:
            print("Efuse %s is already burned." % efuse.register_name)
            return
    elif efuse.efuse_type == "int":
        if args.new_value is None:
            raise esptool.FatalError("New value required for efuse %s" % efuse.register_name)
    elif efuse.efuse_type == "spipin":
        if args.new_value is None or args.new_value == 0:
            raise esptool.FatalError("New value required for efuse %s" % efuse.register_name)
    elif efuse.efuse_type == "bitcount":
        if args.new_value is None:  # find the first unset bit and set it
            args.new_value = old_value
            bit = 1
            while args.new_value == old_value:
                args.new_value = bit | old_value