PS711X_SYSFLG
(*(volatile uint32_t *)(clpscom_cnaddr + PS711X_SYSFLG))
*(volatile uint32_t *)(clpscom_cnaddr + PS711X_SYSFLG) |= SYSCON_UARTEN;
bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, PS711X_SYSFLG)
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, PS711X_SYSFLG, (val))
sysflg = bus_space_read_4(&clps711x_bs_tag, ioh, PS711X_SYSFLG);