diff --git a/include/asm-arm/arch-rpc/debug-macro.S b/include/asm-arm/arch-rpc/debug-macro.S
index 0711828..456d3d7 100644
--- a/include/asm-arm/arch-rpc/debug-macro.S
+++ b/include/asm-arm/arch-rpc/debug-macro.S
@@ -12,7 +12,10 @@
 */
 
 		.macro	addruart,rx
-		mov	\rx, #0xe0000000
+		mrc	p15, 0, \rx, c1, c0
+		tst	\rx, #1			@ MMU enabled?
+		moveq	\rx, #0x03000000
+		movne	\rx, #0xe0000000
 		orr	\rx, \rx, #0x00010000
 		orr	\rx, \rx, #0x00000fe0
 		.endm