How to use the esptool.ESPLoader function in esptool

def detect_board(port: str, baud: int) -> MpyBoard:
    board_cls: Type[MpyBoard]
    rom_cls: Type[ESPLoader]

    loader = ESPLoader(port, baud)
    try:
        connect_attempt(loader)
        data_reg = loader.read_reg(ESPLoader.UART_DATA_REG_ADDR)
        rom_cls, board_cls = CHIP_CLASSES[data_reg]
        esp = rom_cls(loader._port, loader._port.baudrate)
        try:
            return board_cls(
                chip=esp.CHIP_NAME,
                description=esp.get_chip_description(),
                features=esp.get_chip_features(),
                crystal_mhz=esp.get_crystal_freq(),
                flash_size=detect_flash_size(esp),
                mac=":".join(f"{it:02x}" for it in esp.read_mac()),
                port=port,

FLASH_WRITE_SIZE = 0x4000  # matches MAX_WRITE_BLOCK in stub_loader.c
    IS_STUB = True

    def __init__(self, rom_loader):
        self._port = rom_loader._port
        self._trace_enabled = rom_loader._trace_enabled
        self.flush_input()  # resets _slip_reader

    def get_erase_size(self, offset, size):
        return size  # stub doesn't have same size bug as ROM loader


ESP8266ROM.STUB_CLASS = ESP8266StubLoader


class ESP32ROM(ESPLoader):
    """Access class for ESP32 ROM bootloader

    """
    CHIP_NAME = "ESP32"
    IS_STUB = False

    DATE_REG_VALUE = 0x15122500

    IROM_MAP_START = 0x400d0000
    IROM_MAP_END   = 0x40400000
    DROM_MAP_START = 0x3F400000
    DROM_MAP_END   = 0x3F800000

    # ESP32 uses a 4 byte status reply
    STATUS_BYTES_LENGTH = 4

def main():
    parser = argparse.ArgumentParser(description='espcoredump.py v%s - ESP32 Core Dump Utility' % __version__, prog='espcoredump')

    parser.add_argument('--chip', '-c',
                        help='Target chip type',
                        choices=['auto', 'esp32'],
                        default=os.environ.get('ESPTOOL_CHIP', 'auto'))

    parser.add_argument(
        '--port', '-p',
        help='Serial port device',
        default=os.environ.get('ESPTOOL_PORT', esptool.ESPLoader.DEFAULT_PORT))

    parser.add_argument(
        '--baud', '-b',
        help='Serial port baud rate used when flashing/reading',
        type=int,
        default=os.environ.get('ESPTOOL_BAUD', esptool.ESPLoader.ESP_ROM_BAUD))

    subparsers = parser.add_subparsers(
        dest='operation',
        help='Run coredumper {command} -h for additional help')

    parser_debug_coredump = subparsers.add_parser(
        'dbg_corefile',
        help='Starts GDB debugging session with specified corefile')
    parser_debug_coredump.add_argument('--debug', '-d', help='Log level (0..3)', type=int, default=3)
    parser_debug_coredump.add_argument('--gdb', '-g', help='Path to gdb', default='xtensa-esp32-elf-gdb')

def save(self, basename):
        """ Save a set of V1 images for flashing. Parameter is a base filename. """
        # IROM data goes in its own plain binary file
        irom_segment = self.get_irom_segment()
        if irom_segment is not None:
            with open("%s0x%05x.bin" % (basename, irom_segment.addr - ESP8266ROM.IROM_MAP_START), "wb") as f:
                f.write(irom_segment.data)

        # everything but IROM goes at 0x00000 in an image file
        normal_segments = self.get_non_irom_segments()
        with open("%s0x00000.bin" % basename, 'wb') as f:
            self.write_common_header(f, normal_segments)
            checksum = ESPLoader.ESP_CHECKSUM_MAGIC
            for segment in normal_segments:
                checksum = self.save_segment(f, segment, checksum)
            self.append_checksum(f, checksum)

def LoadFirmwareImage(chip, filename):
    """ Load a firmware image. Can be for ESP8266 or ESP32. ESP8266 images will be examined to determine if they are
        original ROM firmware images (ESP8266ROMFirmwareImage) or "v2" OTA bootloader images.

        Returns a BaseFirmwareImage subclass, either ESP8266ROMFirmwareImage (v1) or ESP8266V2FirmwareImage (v2).
    """
    with open(filename, 'rb') as f:
        if chip.lower() == 'esp32':
            return ESP32FirmwareImage(f)
        else:  # Otherwise, ESP8266 so look at magic to determine the image type
            magic = ord(f.read(1))
            f.seek(0)
            if magic == ESPLoader.ESP_IMAGE_MAGIC:
                return ESP8266ROMFirmwareImage(f)
            elif magic == ESPBOOTLOADER.IMAGE_V2_MAGIC:
                return ESP8266V2FirmwareImage(f)
            else:
                raise FatalError("Invalid image magic number: %d" % magic)

def main():
    parser = argparse.ArgumentParser(description='espefuse.py v%s - ESP32 efuse get/set tool' % esptool.__version__, prog='espefuse')

    parser.add_argument(
        '--baud', '-b',
        help='Serial port baud rate used when flashing/reading',
        type=arg_auto_int,
        default=os.environ.get('ESPTOOL_BAUD', esptool.ESPLoader.ESP_ROM_BAUD))

    parser.add_argument(
        '--port', '-p',
        help='Serial port device',
        default=os.environ.get('ESPTOOL_PORT', esptool.ESPLoader.DEFAULT_PORT))

    parser.add_argument(
        '--before',
        help='What to do before connecting to the chip',
        choices=['default_reset', 'no_reset', 'esp32r1', 'no_reset_no_sync'],
        default='default_reset')

    parser.add_argument('--do-not-confirm',
                        help='Do not pause for confirmation before permanently writing efuses. Use with caution.', action='store_true')

    def add_force_write_always(p):
        p.add_argument('--force-write-always', help="Write the efuse even if it looks like it's already been written, or is write protected. " +
                       "Note that this option can't disable write protection, or clear any bit which has already been set.", action='store_true')

    subparsers = parser.add_subparsers(
        dest='operation',

def main():
    parser = argparse.ArgumentParser(description='espefuse.py v%s - ESP32 efuse get/set tool' % esptool.__version__, prog='espefuse')

    parser.add_argument(
        '--baud', '-b',
        help='Serial port baud rate used when flashing/reading',
        type=arg_auto_int,
        default=os.environ.get('ESPTOOL_BAUD', esptool.ESPLoader.ESP_ROM_BAUD))

    parser.add_argument(
        '--port', '-p',
        help='Serial port device',
        default=os.environ.get('ESPTOOL_PORT', esptool.ESPLoader.DEFAULT_PORT))

    parser.add_argument(
        '--before',
        help='What to do before connecting to the chip',
        choices=['default_reset', 'no_reset', 'esp32r1', 'no_reset_no_sync'],
        default='default_reset')

    parser.add_argument('--do-not-confirm',
                        help='Do not pause for confirmation before permanently writing efuses. Use with caution.', action='store_true')

    def add_force_write_always(p):
        p.add_argument('--force-write-always', help="Write the efuse even if it looks like it's already been written, or is write protected. " +
                       "Note that this option can't disable write protection, or clear any bit which has already been set.", action='store_true')

    subparsers = parser.add_subparsers(
        dest='operation',