diff --git a/sys/driver_mem.c b/sys/driver_mem.c
index 7c81d5d..441342a 100644
--- a/sys/driver_mem.c
+++ b/sys/driver_mem.c
@@ -28,8 +28,7 @@
 #error "unknown machine!"
 #endif
 
-#define DBG_DM
-
+// #define DBG_DM
 #ifdef	DBG_DM
 #define	dbg(fmt, args...)	xprintf(fmt, ##args)
 #else