Index: linux-2.6.31/arch/powerpc/platforms/83xx/mpc831x_rdb.c
===================================================================
--- linux-2.6.31.orig/arch/powerpc/platforms/83xx/mpc831x_rdb.c	2009-10-28 14:56:44.000000000 +0100
+++ linux-2.6.31/arch/powerpc/platforms/83xx/mpc831x_rdb.c	2009-10-28 15:44:23.000000000 +0100
@@ -20,6 +20,7 @@
 #include <asm/ipic.h>
 #include <asm/udbg.h>
 #include <sysdev/fsl_pci.h>
+#include <sysdev/simple_gpio.h>
 
 #include "mpc83xx.h"
 
@@ -79,6 +80,9 @@
 
 static int __init declare_of_platform_devices(void)
 {
+	/* memory-mapped IO extender */
+	simple_gpiochip_init("fsl,mpc8313-exio");
+
 	of_platform_bus_probe(NULL, of_bus_ids, NULL);
 	return 0;
 }