IOMOD_DEVOFFSET
iobase = (bus_addr_t)ca->ca_hpa + IOMOD_DEVOFFSET;
bus_space_subregion(sgc->sc_iot, sgc->sc_ioh, IOMOD_DEVOFFSET,
IOMOD_HPASIZE - IOMOD_DEVOFFSET, &sc->sc_c.sc_rh);
rv = fdcprobe1(ca->ca_iot, ioh | IOMOD_DEVOFFSET);
ioh |= IOMOD_DEVOFFSET;