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