MGB_INTR_ENBL_CLR
CSR_WRITE_REG(sc, MGB_INTR_ENBL_CLR,
CSR_WRITE_REG(sc, MGB_INTR_ENBL_CLR, UINT32_MAX);
CSR_WRITE_REG(sc, MGB_INTR_ENBL_CLR, MGB_INTR_STS_TEST);