diff --git a/src/mainboard/amd/rumba/romstage.c b/src/mainboard/amd/rumba/romstage.c
index dc2555992c..f8cd775f02 100644
--- a/src/mainboard/amd/rumba/romstage.c
+++ b/src/mainboard/amd/rumba/romstage.c
@@ -16,7 +16,7 @@
 #include "southbridge/amd/cs5536/cs5536_early_setup.c"
 
 #define DIMM0 0xA0
-#define DIMM1 0xA2
+#define DIMM1 0xFF /* DIMM1 is not available/used on this board. */
 
 static inline int spd_read_byte(unsigned device, unsigned address)
 {
diff --git a/src/mainboard/lippert/frontrunner/romstage.c b/src/mainboard/lippert/frontrunner/romstage.c
index 6630b581d8..f86abef5a5 100644
--- a/src/mainboard/lippert/frontrunner/romstage.c
+++ b/src/mainboard/lippert/frontrunner/romstage.c
@@ -18,7 +18,7 @@
 #include "southbridge/amd/cs5535/cs5535_early_setup.c"
 
 #define DIMM0 0xA0
-#define DIMM1 0xA2
+#define DIMM1 0xFF /* DIMM1 is not available/used on this board. */
 
 static const unsigned char spdbytes[] = {	/* 4x Qimonda HYB25DC512160CF-6 */
 	0xFF, 0xFF,				/* only values used by raminit.c are set */
diff --git a/src/mainboard/wyse/s50/romstage.c b/src/mainboard/wyse/s50/romstage.c
index 64849be771..657667cfe8 100644
--- a/src/mainboard/wyse/s50/romstage.c
+++ b/src/mainboard/wyse/s50/romstage.c
@@ -35,7 +35,7 @@
 #include "southbridge/amd/cs5536/cs5536_early_setup.c"
 
 #define DIMM0 0xA0
-#define DIMM1 0xA2
+#define DIMM1 0xFF /* DIMM1 is not available/used on this board. */
 
 static inline int spd_read_byte(unsigned int device, unsigned int address)
 {