SDHCI_ADMA_ADDRESS_LOW
WR4(slot, SDHCI_ADMA_ADDRESS_LOW, descmem->dmem_busaddr);
RD4(slot, SDHCI_ADMA_ADDRESS_LOW), RD2(slot, SDHCI_SLOT_INT_STATUS));
addr = RD4(slot, SDHCI_ADMA_ADDRESS_LOW);
addr = RD4(slot, SDHCI_ADMA_ADDRESS_LOW);
addr = RD4(slot, SDHCI_ADMA_ADDRESS_LOW);