rc (ULONG)

      Return codes indicating success or failure:

      MMIO_SUCCESS

        The request was successful.
      MMIO_ERROR
        An error code is returned.
      MMIOERR_MISSING_FLAG
        A required flag was not supplied with the command.
      MMIOERR_INVALID_ITEM_FLAG
        One or more of the item flags specified are invalid for this command.

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