AT_LCYL
ata_ctlp->ac_lcyl = (uchar_t *)ioaddr1 + AT_LCYL;
ddi_get8(io_hdl, (uchar_t *)ioaddr + AT_LCYL) != ATAPI_SIG_LO)
ddi_put8(io_hdl, (uchar_t *)ioaddr + AT_LCYL, 0);