diff --git a/sys/powerpc/powerpc/autoconf.c b/sys/powerpc/powerpc/autoconf.c
index 06787f7ad904..2f3b52781a94 100644
--- a/sys/powerpc/powerpc/autoconf.c
+++ b/sys/powerpc/powerpc/autoconf.c
@@ -35,18 +35,35 @@ __FBSDID("$FreeBSD$");
 
 static device_t nexusdev;
 
+static void	configure_first(void *);
 static void	configure(void *);
-SYSINIT(configure, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL)
+static void	configure_final(void *);
+
+SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
+/* SI_ORDER_SECOND is hookable */
+SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
+/* SI_ORDER_MIDDLE is hookable */
+SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
 
 /*
  * Determine i/o configuration for a machine.
  */
+static void
+configure_first(void *dummy)
+{
+}
+
 static void
 configure(void *dummy)
 {
 	nexusdev = device_add_child(root_bus, "nexus", 0);
-	root_bus_configure();
 
+	root_bus_configure();
+}
+
+static void
+configure_final(void *dummy)
+{
 	/*
 	 * Enable device interrupts
 	 */
@@ -54,3 +71,5 @@ configure(void *dummy)
 
 	cold = 0;
 }
+
+