SDHC_SYS_CTRL
HSET4(sc, SDHC_SYS_CTRL, mask);
if (!ISSET(HREAD4(sc, SDHC_SYS_CTRL), mask))
HREAD4(sc, SDHC_SYS_CTRL)));
HSET4(sc, SDHC_SYS_CTRL, 0xe << SDHC_SYS_CTRL_DTOCV_SHIFT);
HCLR4(sc, SDHC_SYS_CTRL, SDHC_SYS_CTRL_CLOCK_MASK);
HSET4(sc, SDHC_SYS_CTRL,