Index: sys/dev/fdt/simplebus.h
===================================================================
--- sys/dev/fdt/simplebus.h
+++ sys/dev/fdt/simplebus.h
@@ -67,5 +67,6 @@
     struct simplebus_softc *sc);
 
 int simplebus_attach(device_t dev);
+int simplebus_detach(device_t dev);
 
 #endif	/* _FDT_SIMPLEBUS_H */
Index: sys/dev/fdt/simplebus.c
===================================================================
--- sys/dev/fdt/simplebus.c
+++ sys/dev/fdt/simplebus.c
@@ -67,7 +67,7 @@
 	/* Device interface */
 	DEVMETHOD(device_probe,		simplebus_probe),
 	DEVMETHOD(device_attach,	simplebus_attach),
-	DEVMETHOD(device_detach,	bus_generic_detach),
+	DEVMETHOD(device_detach,	simplebus_detach),
 	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
 	DEVMETHOD(device_suspend,	bus_generic_suspend),
 	DEVMETHOD(device_resume,	bus_generic_resume),
@@ -155,6 +155,33 @@
 	for (node = OF_child(sc->node); node > 0; node = OF_peer(node))
 		simplebus_add_device(dev, node, 0, NULL, -1, NULL);
 	return (bus_generic_attach(dev));
+}
+
+int
+simplebus_detach(device_t dev)
+{
+	struct simplebus_softc *sc;
+	struct simplebus_devinfo *ndi;
+	device_t *devlist;
+	int index, num;
+
+	sc = device_get_softc(dev);
+
+	/* Free ranges */
+	if (sc->ranges)
+		free(sc->ranges, M_DEVBUF);
+
+	/* Free simplebus_devinfo ndi */
+	device_get_children(dev, &devlist, &num);
+	for (index = 0; index < num; index++) {
+		ndi = device_get_ivars(devlist[index]);
+		free(ndi, M_DEVBUF);
+	}
+	free(devlist, M_TEMP);
+
+	bus_generic_detach(dev);
+
+	return (0);
 }
 
 void