diff --git a/arch/powerpc/include/asm/ppc405ez.h b/arch/powerpc/include/asm/ppc405ez.h
index 9192c62..cb8e994 100644
--- a/arch/powerpc/include/asm/ppc405ez.h
+++ b/arch/powerpc/include/asm/ppc405ez.h
@@ -24,8 +24,13 @@
 #define CONFIG_NAND_NDFC
 
 /* Memory mapped register */
-#define GPIO0_BASE	0xef600700
-#define GPIO1_BASE	0xef600800
+#define CONFIG_SYS_PERIPHERAL_BASE	0xef600000 /* Internal Peripherals */
+
+#define CONFIG_SYS_NS16550_COM1	(CONFIG_SYS_PERIPHERAL_BASE + 0x0300)
+#define CONFIG_SYS_NS16550_COM2	(CONFIG_SYS_PERIPHERAL_BASE + 0x0400)
+
+#define GPIO0_BASE		(CONFIG_SYS_PERIPHERAL_BASE + 0x0700)
+#define GPIO1_BASE		(CONFIG_SYS_PERIPHERAL_BASE + 0x0800)
 
 /* DCR register */
 #define OCM0_PLBCR1	0x0020	/* OCM PLB3 Bank 1 Config */