SATA_SATAICTL
ifctl = MVSATA_EDMA_READ_4(mvport, SATA_SATAICTL);
MVSATA_EDMA_WRITE_4(mvport, SATA_SATAICTL, ifctl);
drive = MVSATA_EDMA_READ_4(mvport, SATA_SATAICTL) & 0xf;