SDHC_SAMPLING_CLOCK_SEL
HCLR2(hp, SDHC_HOST_CTL2, SDHC_SAMPLING_CLOCK_SEL);
SDHC_SAMPLING_CLOCK_SEL|SDHC_EXECUTE_TUNING);
if ((HREAD2(hp, SDHC_HOST_CTL2) & SDHC_SAMPLING_CLOCK_SEL) == 0) {
SDHC_SAMPLING_CLOCK_SEL|SDHC_EXECUTE_TUNING);