SMF_CARD_ATTACHED
if (!ISSET(sc->sc_flags, SMF_CARD_ATTACHED))
CLR(sc->sc_flags, SMF_CARD_ATTACHED);
SET(sc->sc_flags, SMF_CARD_ATTACHED);
if (ISSET(sc->sc_flags, SMF_CARD_ATTACHED)) {
CLR(sc->sc_flags, SMF_CARD_ATTACHED);