HC_ARGUMENT
WR4(sc, HC_ARGUMENT, val2);
RD4(sc, HC_ARGUMENT));
WR4(sc, HC_ARGUMENT, 0);
WR4(sc, HC_ARGUMENT, sc->sdcard_rca << 16);
WR4(sc, HC_ARGUMENT, 0x00000000);
save_sdarg = RD4(sc, HC_ARGUMENT);
WR4(sc, HC_ARGUMENT, sc->sdhci_blockcount);
WR4(sc, HC_ARGUMENT, save_sdarg);
sc->sdcard_rca = (RD4(sc, HC_ARGUMENT) >> 16);
(RD4(sc, HC_ARGUMENT) & 0x0000ffff);