diff --git a/include/asm-arm/arch-ebsa285/debug-macro.S b/include/asm-arm/arch-ebsa285/debug-macro.S
index 237853d..97d15fc 100644
--- a/include/asm-arm/arch-ebsa285/debug-macro.S
+++ b/include/asm-arm/arch-ebsa285/debug-macro.S
@@ -45,9 +45,12 @@
 		.equ	dc21285_low,  ARMCSR_BASE & 0x00ffffff
 
 		.macro	addruart,rx
-		mov	\rx, #dc21285_high
+		mrc	p15, 0, \rx, c1, c0
+		tst	\rx, #1			@ MMU enabled?
+		moveq	\rx, #0x42000000
+		movne	\rx, #dc21285_high
 		.if	dc21285_low
-		orr	\rx, \rx, #dc21285_low
+		orrne	\rx, \rx, #dc21285_low
 		.endif
 		.endm
 
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