code: def get_boot_device(self):
          
          operation = 'get_boot_device'
          try:
              boot_device = self.sp_manager.get_boot_device()
              return boot_device
          except UcsException as ex:
              print(_("Cisco client exception: %(msg)s."), {'msg': ex})
              raise exception.UcsOperationError(operation=operation, error=ex)
docs: Get the current boot device for the node.
  
              Provides the current boot device of the node. Be aware that not
              all drivers support this.
  
              :raises: InvalidParameterValue if any connection parameters are
                  incorrect.
              :raises: MissingParameterValue if a required parameter is missing
              :returns: a dictionary containing:
  
              :boot_device: the boot device, one of
              :mod:`ironic.common.boot_devices` or None if it is unknown.
              :persistent: Whether the boot device will persist to all
                  future boots or not, None if it is unknown.