ADA_FLAG_CAN_DMA48
softc->flags |= ADA_FLAG_CAN_DMA48;
softc->flags &= ~ADA_FLAG_CAN_DMA48;
softc->flags &= ~(ADA_FLAG_CAN_48BIT | ADA_FLAG_CAN_DMA48);
if (softc->flags & ADA_FLAG_CAN_DMA48) {