AW_MMC_RISR
AW_MMC_WRITE_4(sc, AW_MMC_RISR, rint);
AW_MMC_WRITE_4(sc, AW_MMC_RISR, 0xffffffff);
AW_MMC_WRITE_4(sc, AW_MMC_RISR, 0xffffffff);
AW_MMC_WRITE_4(sc, AW_MMC_RISR, 0xffffffff);
rint = AW_MMC_READ_4(sc, AW_MMC_RISR);