SDMMC_INTMASK
HWRITE4(sc, SDMMC_INTMASK, 0);
HCLR4(sc, SDMMC_INTMASK, SDMMC_RINTSTS_SDIO);
HSET4(sc, SDMMC_INTMASK, SDMMC_RINTSTS_SDIO);
HCLR4(sc, SDMMC_INTMASK, SDMMC_RINTSTS_SDIO);
HSET4(sc, SDMMC_INTMASK, SDMMC_RINTSTS_SDIO);