sdmmc_io_set_blocklen
sdmmc_io_set_blocklen(sc->sc_sf[1], 64);
sdmmc_io_set_blocklen(sc->sc_sf[2], 512);
sdmmc_io_set_blocklen(ssc->sc_sf, 64);
int sdmmc_io_set_blocklen(struct sdmmc_function *, int);