SL11_IER
e = slhci_read(sc, SL11_IER);
if (sc->sc_ier != slhci_read(sc, SL11_IER)) {
slhci_write(sc, SL11_IER, new_ier);
r = slhci_read(ssc, SL11_IER);
ier = slhci_read(ssc, SL11_IER);