docs: def _get_bios_mappings_resource(self, data):
          """Get the Mappings resource.
  
          :param data: Existing Bios settings of the server.
          :returns: mappings settings.
          :raises: IloCommandNotSupportedError, if resource is not found.
          :raises: IloError, on an error from iLO.
          """
          try:
              map_uri = data['links']['Mappings']['href']
          except KeyError:
              msg = ('Mappings resource not found.')
              raise exception.IloCommandNotSupportedError(msg)
  
          status, headers, map_settings = self._rest_get(map_uri)
          if status != 200:
              msg = self._get_extended_error(map_settings)
              raise exception.IloError(msg)
  
          return map_settings