DWORD MCI_Set_Address(void) {
    volatile DWORD i; // mthomas - volatile
    DWORD retryCount;
    DWORD respStatus;
    DWORD respValue[4];
    DWORD CmdArgument;

    /* If it's a SD card, SET_RELATIVE_ADDR is to get the address
     from the card and use this value in RCA, if it's a MMC, set default
     RCA addr. 0x00010000. */
#if 1
    // mthomas:
    if (MCI_CardType & MMC_CARD) {
        /* If it's unknown or MMC_CARD, fix the RCA address */
        CmdArgument = 0x00010000;
    } else {
        CmdArgument = 0;
    }
#else
    // NXP original:
    if ( MCI_CardType == SD_CARD )
    {
        CmdArgument = 0;
    }
    else /* If it's unknown or MMC_CARD, fix the RCA address */
    {
        CmdArgument = 0x00010000;
    }
#endif

    retryCount = 0x20; /* reset retry counter */
    while (retryCount > 0) {
        /* Send CMD3 command repeatedly until the response is back correctly */
        MCI_SendCmd( SET_RELATIVE_ADDR, CmdArgument, EXPECT_SHORT_RESP, 0);
        respStatus = MCI_GetCmdResp( SET_RELATIVE_ADDR, EXPECT_SHORT_RESP, (DWORD *)&respValue[0]);
        /* bit 0 and bit 2 must be zero, or it's timeout or CRC error */
        /* It should go to IDEN state and bit 8 should be 1 */
        if ( !(respStatus & MCI_CMD_TIMEOUT) && ((respValue[0] & (0x0F << 8))
                == 0x0500)) {
            CardRCA = respValue[0] & 0xFFFF0000; /* Save the RCA value from SD card */
            return ( TRUE ); /* response is back and correct. */
        }
        for (i = 0; i < 0x20; i++) {
        ;
        }
        retryCount--;
    }
    return ( FALSE );
}

respStatus = MCI_GetCmdResp( SET_RELATIVE_ADDR, EXPECT_SHORT_RESP, (DWORD *)&respValue[0]);