Changes to NSH and readline to permit NSH to work on a platform with no file system

configs/freedom-kl25z/README.txt

@@ -336,6 +336,13 @@ Where <subdir> is one of the following:
        of an RS-232 serial console.  However, that configuration has not
        been impelmented as of this writing.
 
+  minnsh:
+  ------
+
+    This is a experiment to see just how small we can get a usable NSH
+    configuration.  This configuration has far fewer features than the nsh
+    configuration but is also a fraction of the size.
+
   nsh:
   ---
     Configures the NuttShell (nsh) located at apps/examples/nsh.  The

include/nuttx/arch.h

@@ -362,7 +362,7 @@ void up_release_pending(void);
  *
  * Description:
  *   Called when the priority of a running or
- *   ready-to-run task changes and the reprioritization will 
+ *   ready-to-run task changes and the reprioritization will
  *   cause a context switch.  Two cases:
  *
  *   1) The priority of the currently running task drops and the next
@@ -1111,6 +1111,16 @@ void relays_powermodes(uint32_t relays_stat);
 
 int up_putc(int ch);
 
+/****************************************************************************
+ * Name: up_getc
+ *
+ * Description:
+ *   Get one character on the console
+ *
+ ****************************************************************************/
+
+int up_getc(void);
+
 #ifdef __cplusplus
 }
 #endif