diff --git a/tools/cfgdefine.c b/tools/cfgdefine.c
index 4349ef0cd18..78fd81b032c 100644
--- a/tools/cfgdefine.c
+++ b/tools/cfgdefine.c
@@ -343,8 +343,8 @@ void generate_definitions(FILE *stream)
                   printf("#undef %s\n", varname);
                 }
 
-              /* Simply define the configuration variable if it has the special
-               * value "y"
+              /* Simply define the configuration variable to '1' if it has the
+               * special value "y"
                */
 
               else if (strcmp(varval, "y") == 0)
@@ -352,6 +352,13 @@ void generate_definitions(FILE *stream)
                   printf("#define %s 1\n", varname);
                 }
 
+              /* Or to '2' if it has the special value "m" */
+
+              else if (strcmp(varval, "m") == 0)
+                {
+                  printf("#define %s 2\n", varname);
+                }
+
               /* Otherwise, use the value as provided */
 
               else
diff --git a/tools/mkconfig.c b/tools/mkconfig.c
index 6a949e7ea2e..a5a8917a626 100644
--- a/tools/mkconfig.c
+++ b/tools/mkconfig.c
@@ -98,6 +98,10 @@ int main(int argc, char **argv, char **envp)
   printf("/* config.h -- Autogenerated! Do not edit. */\n\n");
   printf("#ifndef __INCLUDE_NUTTX_CONFIG_H\n");
   printf("#define __INCLUDE_NUTTX_CONFIG_H\n\n");
+  printf("/* General Definitions ***********************************/\n");
+  printf("/* Used to represent the values of tristate options */\n\n");
+  printf("#define CONFIG_y 1\n");
+  printf("#define CONFIG_m 2\n\n");
   printf("/* Architecture-specific options *************************/\n\n");
 
   generate_definitions(stream);