viewtool-stm32f107: Add support to auto-mount the procfs file system

configs/viewtool-stm32f107/src/stm32_appinit.c

 /****************************************************************************
  * config/viewtool-stm32f107/src/stm32_appinit.c
  *
- *   Copyright (C) 2013, 2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2013, 2016-2017 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -40,6 +40,7 @@
 #include <nuttx/config.h>
 
 #include <sys/types.h>
+#include <sys/mount.h>
 #include <syslog.h>
 #include <errno.h>
 #include <debug.h>
@@ -156,6 +157,17 @@ int board_app_initialize(uintptr_t arg)
     }
 #endif
 
+#ifdef CONFIG_FS_PROCFS
+  /* Mount the procfs file system */
+
+  ret = mount(NULL, STM32_PROCFS_MOUNTPOINT, "procfs", 0, NULL);
+  if (ret < 0)
+    {
+      serr("ERROR: Failed to mount procfs at %s: %d\n",
+           STM32_PROCFS_MOUNTPOINT, ret);
+    }
+#endif
+
 #ifdef HAVE_MMCSD
   ret = stm32_sdinitialize(CONFIG_NSH_MMCSDSLOTNO);
   if (ret < 0)

configs/viewtool-stm32f107/src/viewtool_stm32f107.h

@@ -98,6 +98,16 @@
 #  undef HAVE_RTC_DRIVER
 #endif
 
+/* procfs File System */
+
+#ifdef CONFIG_FS_PROCFS
+#  ifdef CONFIG_NSH_PROC_MOUNTPOINT
+#    define STM32_PROCFS_MOUNTPOINT CONFIG_NSH_PROC_MOUNTPOINT
+#  else
+#    define STM32_PROCFS_MOUNTPOINT "/proc"
+#  endif
+#endif
+
 /* GPIO Configuration *******************************************************/
 /* LEDs
  *