Serial driver needed even when no console; Fix user LED settings in all STM32 configurations

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5575 42af7a65-404d-4744-a932-0658087f49c3

misc/tools/README.txt

@@ -30,25 +30,34 @@ kconfig-frontends
   General build instructions:
 
     cd kconfig-frontends
-    ./configure
+    ./configure --enable-mconf
     make
     make install
 
-  To suppress the nconf and the graphical interfaces which are not used by
-  NuttX:
+  It is a good idea to add '--enable-mconf' on the 'configure' command line.
+  The kconfig-frontends make will generate many programs, but the NuttX
+  build system only needs the 'kconfig-conf' and 'kconfig-mconf' programs.
+  If the requirements for 'kconfig-mconf' are not supported by your system,
+  the kconfig-frontends configuration system will not build it.  Adding the
+  option --enable-mconf assures you that 'kconfig-mconf' will be built or
+  if it is not built, it will tell you why it was not built.
 
-    ./configure --disable-gconf --disable-qconf
+  To suppress the 'nconf' and the graphical front-ends which are not used by
+  NuttX, you can add:
+
+    ./configure --enable-mconfig --disable-nconf --disable-gconf --disable-qconf
     make
     make install
 
   To suppress the graphical interfaces, use static libraries, and disable
   creation of other utilities:
 
-    ./configure --disable-shared --enable-static --disable-gconf --disable-qconf --disable-nconf --disable-utils
+    ./configure --disable-shared --enable-static --enable-mconfig --disable-nconf --disable-gconf --disable-qconf --disable-nconf --disable-utils
     make
     make install
 
-  You may require root privileges to 'make install'.
+  The default installation location for the tools is /usr/local/bin.  You
+  may require root privileges to 'make install'.
 
 --program-prefix=
 -----------------