arch/arm/src/sam34: Fix some compile warnings that I introduced with a possibly overzealous recent change.

arch/arm/src/sam34/sam_start.h

@@ -0,0 +1,62 @@
+/************************************************************************************
+ * arch/arm/src/sam34/sam_start.h
+ *
+ *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_SAM34_SAM_START_H
+#define __ARCH_ARM_SRC_SAM34_SAM_START_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+/************************************************************************************
+ * Public Function Prototypes
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: sam_boardinitialize
+ *
+ * Description:
+ *   All SAM3/4 architectures must provide the following entry point.  This entry
+ *   point is called early in the initialization -- after clocking and memory have
+ *   been configured but before caches have been enabled and before any devices have
+ *   been initialized.
+ *
+ ************************************************************************************/
+
+void sam_boardinitialize(void);
+
+#endif /* __ARCH_ARM_SRC_SAM34_SAM_START_H */

drivers/input/ft5x06.c

@@ -378,6 +378,12 @@ static ssize_t ft5x06_sample(FAR struct ft5x06_dev_s *priv, FAR char *buffer,
       ntouches = maxtouches;
     }
 
+  if (ntouches < 1)
+    {
+      priv->valid = false;
+      return 0;  /* No touches read. */
+    }
+
   /* User data buffer points (sink) */
 
   sample = (FAR struct touch_sample_s *)buffer;

fs/fat/Kconfig

@@ -34,7 +34,7 @@ config FAT_MAXFNAME
 	int "FAT maximum file name size"
 	depends on FAT_LFN
 	default 32
-	range 1 255
+	range 12 255
 	---help---
 		If FAT_LFN is defined, then the default, maximum long file
 		name is 255 bytes.  This can eat up a lot of memory (especially stack
@@ -44,7 +44,7 @@ config FAT_MAXFNAME
 		limit the visibility of longer file names anyway.
 
 		This setting may not exceed NAME_MAX.  That will be verified at compile
-		time.
+		time.  The minimum values is 12 due to assumptions in internal logic.
 
 config FS_FATTIME
 	bool "FAT timestamps"