SDHC_PROT_CTRL
HCLR4(sc, SDHC_PROT_CTRL, SDHC_PROT_CTRL_DMASEL_MASK);
HCLR4(sc, SDHC_PROT_CTRL, SDHC_PROT_CTRL_DTW_MASK);
reg = HREAD4(sc, SDHC_PROT_CTRL) & ~SDHC_PROT_CTRL_DTW_MASK;
HWRITE4(sc, SDHC_PROT_CTRL, reg);
HCLR4(sc, SDHC_PROT_CTRL, SDHC_PROT_CTRL_DMASEL_MASK);
HSET4(sc, SDHC_PROT_CTRL, SDHC_PROT_CTRL_DMASEL_ADMA2);
HCLR4(sc, SDHC_PROT_CTRL, SDHC_PROT_CTRL_DMASEL_MASK);