diff --git a/arch/arm/mach-footbridge/include/mach/hardware.h b/arch/arm/mach-footbridge/include/mach/hardware.h
index 02f6d7a706b1..20d5ad781fe2 100644
--- a/arch/arm/mach-footbridge/include/mach/hardware.h
+++ b/arch/arm/mach-footbridge/include/mach/hardware.h
@@ -59,7 +59,7 @@
 #define XBUS_SWITCH_J17_11	((*XBUS_SWITCH) & (1 << 5))
 #define XBUS_SWITCH_J17_9	((*XBUS_SWITCH) & (1 << 6))
 
-#define UNCACHEABLE_ADDR	(ARMCSR_BASE + 0x108)
+#define UNCACHEABLE_ADDR	(ARMCSR_BASE + 0x108)	/* CSR_ROMBASEMASK */
 
 
 /* PIC irq control */
diff --git a/arch/arm/mach-rpc/include/mach/hardware.h b/arch/arm/mach-rpc/include/mach/hardware.h
index 257166b21f3d..aa79fa47373a 100644
--- a/arch/arm/mach-rpc/include/mach/hardware.h
+++ b/arch/arm/mach-rpc/include/mach/hardware.h
@@ -40,7 +40,7 @@
 #define SCREEN_END		0xdfc00000
 #define SCREEN_BASE		0xdf800000
 
-#define UNCACHEABLE_ADDR	0xdf010000
+#define UNCACHEABLE_ADDR	(FLUSH_BASE + 0x10000)
 
 /*
  * IO Addresses
diff --git a/arch/arm/mach-sa1100/include/mach/hardware.h b/arch/arm/mach-sa1100/include/mach/hardware.h
index 55c85ce7010d..d944fd7e464f 100644
--- a/arch/arm/mach-sa1100/include/mach/hardware.h
+++ b/arch/arm/mach-sa1100/include/mach/hardware.h
@@ -13,7 +13,7 @@
 #define __ASM_ARCH_HARDWARE_H
 
 
-#define UNCACHEABLE_ADDR	0xfa050000
+#define UNCACHEABLE_ADDR	0xfa050000	/* ICIP */
 
 
 /*