text: 
  class board_info:
    def set(key, value=None):
      return setattr(__class__, key, value)
    def all():
      return dir(__class__)
    def get():
      return getattr(__class__, key)
    def load(__map__={}):
      for k, v in __map__.items():
        __class__.set(k, v)
  
  from Maix import config
  tmp = config.get_value('board_info', None)
  if tmp != None:
      board_info.load(tmp)
  else:
      print('[Warning] Not loaded from /flash/config.json to board_info.')
  
  if __name__ == "__main__":
    def check_config_json(data):
      try:
        with open('/flash/config.json', 'rb') as f:
          tmp = json.loads(f.read())
          if tmp["type"] != data["type"]:
            raise Exception('config.json no exist')
      except Exception as e:
        with open('/flash/config.json', "w") as f:
          f.write(cfg)
        import machine
        machine.reset()
  
    print(board_info.all())
    board_info.set('test', 123)
    print(board_info.test)
    print(board_info.all())
  
    import json
    test = {
        "type": "test",
        "board_info": {
            'PIN10': 10,
            'BOOT_KEY': 16,
            'WIFI_TX': 6,
            'WIFI_RX': 7,
            'WIFI_EN': 8,
        }
    }
    cfg = json.dumps(test)
    check_config_json(test)
    from Maix import config
    tmp = config.get_value('board_info', None)
    if tmp != None:
      board_info.load(tmp)
    print(board_info.all())
    print(board_info.PIN10)
    print(board_info.BOOT_KEY)
    print(board_info.WIFI_TX)
    print(board_info.WIFI_RX)
    print(board_info.WIFI_EN)
  