diff --git a/src/mainboard/google/butterfly/cmos.layout b/src/mainboard/google/butterfly/cmos.layout
index ee5ee256c1..f0163f1ea8 100644
--- a/src/mainboard/google/butterfly/cmos.layout
+++ b/src/mainboard/google/butterfly/cmos.layout
@@ -74,12 +74,14 @@ entries
 
 # -----------------------------------------------------------------
 # coreboot config options: console
-392          3       e       5        baud_rate
+# No serial port on this motherboard
+#392          3       e       5        baud_rate
 395          4       e       6        debug_level
 #399          1       r       0        unused
 
 # coreboot config options: cpu
-400          1       e       2        hyper_threading
+# hyper_threading not supported by the Celeron 847 on this board
+#400          1       e       2        hyper_threading
 #401          7       r       0        unused
 
 # coreboot config options: southbridge