SDMMC_INTMASK_RXDR
WRITE4(sc, SDMMC_RINTSTS, SDMMC_INTMASK_RXDR);
if (reg & (SDMMC_INTMASK_RXDR|SDMMC_INTMASK_DTO)) {
SDMMC_INTMASK_RXDR |
reg &= ~(SDMMC_INTMASK_TXDR | SDMMC_INTMASK_RXDR);