diff --git a/include/asm-microblaze/suzaku.h b/include/asm-microblaze/suzaku.h
index 4d2b270..c57a144 100644
--- a/include/asm-microblaze/suzaku.h
+++ b/include/asm-microblaze/suzaku.h
@@ -22,4 +22,6 @@
  * MA 02111-1307 USA
  */
 
-/* EMPTY FILE */
+/* System Register (GPIO) */
+#define MICROBLAZE_SYSREG_BASE_ADDR 0xFFFFA000
+#define MICROBLAZE_SYSREG_RECONFIGURE (1 << 0)