diff --git a/src/include/spd.h b/src/include/spd.h
index 8aaad6b..dfb0cc2 100644
--- a/src/include/spd.h
+++ b/src/include/spd.h
@@ -166,5 +166,70 @@
 #define DIMM6                            0x56
 #define DIMM7                            0x57
 
-#endif /* _SPD_H_ */
+#define RC00 0
+#define RC01 1
+#define RC02 2
+#define RC03 3
+#define RC04 4
+#define RC05 5
+#define RC06 6
+#define RC07 7
+#define RC08 8
+#define RC09 9
+#define RC10 10
+#define RC11 11
+#define RC12 12
+#define RC13 13
+#define RC14 14
+#define RC15 15
+#define RC16 16
+#define RC17 17
+#define RC18 18
+#define RC19 19
+#define RC20 20
+#define RC21 21
+#define RC22 22
+#define RC23 23
+#define RC24 24
+#define RC25 25
+#define RC26 26
+#define RC27 27
+#define RC28 28
+#define RC29 29
+#define RC30 30
+#define RC31 31
 
+#define RC32 32
+#define RC33 33
+#define RC34 34
+#define RC35 35
+#define RC36 36
+#define RC37 37
+#define RC38 38
+#define RC39 39
+#define RC40 40
+#define RC41 41
+#define RC42 42
+#define RC43 43
+#define RC44 44
+#define RC45 45
+#define RC46 46
+#define RC47 47
+#define RC48 48
+#define RC49 49
+#define RC50 50
+#define RC51 51
+#define RC52 52
+#define RC53 53
+#define RC54 54
+#define RC55 55
+#define RC56 56
+#define RC57 57
+#define RC58 58
+#define RC59 59
+#define RC60 60
+#define RC61 61
+#define RC62 62
+#define RC63 63
+
+#endif