STM32L4: Eliminate a warning about implicit definition of function. While we are at it, let's improve the naming a little too.

arch/arm/src/stm32l4/stm32l4_spi.c

@@ -41,7 +41,7 @@
  * are provided by common STM32 logic.  To use this common SPI logic on your
  * board:
  *
- *   1. Provide logic in stm32l4_boardinitialize() to configure SPI chip select
+ *   1. Provide logic in stm32l4_board_initialize() to configure SPI chip select
  *      pins.
  *   2. Provide stm32l4_spi1/2/3select() and stm32l4_spi1/2/3status() functions in your
  *      board-specific logic.  These functions will perform chip selection and

arch/arm/src/stm32l4/stm32l4_spi.h

@@ -97,7 +97,7 @@ FAR struct spi_dev_s *stm32l4_spibus_initialize(int bus);
  *   (including stm32l4_spibus_initialize()) are provided by common STM32 logic.  To use this
  *   common SPI logic on your board:
  *
- *   1. Provide logic in stm32l4_boardinitialize() to configure SPI chip select
+ *   1. Provide logic in stm32l4_board_initialize() to configure SPI chip select
  *      pins.
  *   2. Provide stm32l4_spi1/2/...select() and stm32l4_spi1/2/...status() functions in your
  *      board-specific logic.  These functions will perform chip selection and

arch/arm/src/stm32l4/stm32l4_start.c

@@ -358,7 +358,7 @@ void __start(void)
 
   /* Initialize onboard resources */
 
-  stm32l4_boardinitialize();
+  stm32l4_board_initialize();
   showprogress('F');
 
   /* Then start NuttX */

arch/arm/src/stm32l4/stm32l4_start.h

@@ -0,0 +1,59 @@
+/************************************************************************************
+ * arch/arm/src/stm32l4/stm32l4_start.h
+ *
+ *   Copyrigth (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_STM32L4_STM32L4_START_H
+#define __ARCH_ARM_SRC_STM32L4_STM32L4_START_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Function Prototypes
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: stm32l4_board_initialize
+ *
+ * Description:
+ *   All STM32L4 architectures must provide the following entry point.  This entry
+ *   point is called early in the initialization -- after all memory has been
+ *   configured and mapped but before any devices have been initialized.
+ *
+ ************************************************************************************/
+
+void stm32l4_board_initialize(void);
+
+#endif /* __ARCH_ARM_SRC_STM32L4_STM32L4_START_H */

configs/b-l475e-iot01a/src/stm32_boot.c

@@ -43,6 +43,7 @@
 #include <arch/board/board.h>
 
 #include "up_arch.h"
+#include "stm32l4_start.h"
 #include "b-l475e-iot01a.h"
 
 /************************************************************************************
@@ -50,16 +51,16 @@
  ************************************************************************************/
 
 /************************************************************************************
- * Name: stm32_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
- *   All STM32 architectures must provide the following entry point.  This entry point
+ *   All STM32L4 architectures must provide the following entry point.  This entry
- *   is called early in the initialization -- after all memory has been configured
+ *   point is called early in the initialization -- after all memory has been
- *   and mapped but before any devices have been initialized.
+ *   configured and mapped but before any devices have been initialized.
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void)
+void stm32l4_board_initialize(void)
 {
 #ifdef CONFIG_ARCH_LEDS
   /* Configure on-board LEDs if LED support has been selected. */

configs/nucleo-l432kc/include/board.h

@@ -243,7 +243,7 @@ extern "C"
  * Public Function Prototypes
  ************************************************************************************/
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32L4 architectures must provide the following entry point.  This entry point
@@ -252,7 +252,7 @@ extern "C"
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void);
+void stm32l4_board_initialize(void);
 
 #undef EXTERN
 #if defined(__cplusplus)

configs/nucleo-l432kc/src/stm32_boot.c

@@ -64,7 +64,7 @@
  ************************************************************************************/
 
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32L4 architectures must provide the following entry point.  This entry point
@@ -73,7 +73,7 @@
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void)
+void stm32l4_board_initialize(void)
 {
   /* Configure on-board LEDs if LED support has been selected. */
 

configs/nucleo-l432kc/src/stm32_spi.c

@@ -114,7 +114,7 @@ void stm32l4_spiinitialize(void)
  *   are provided by common STM32 logic.  To use this common SPI logic on your
  *   board:
  *
- *   1. Provide logic in stm32l4_boardinitialize() to configure SPI chip select
+ *   1. Provide logic in stm32l4_board_initialize() to configure SPI chip select
  *      pins.
  *   2. Provide stm32l4_spi1/2select() and stm32l4_spi1/2status() functions in your
  *      board-specific logic.  These functions will perform chip selection and

configs/nucleo-l452re/include/board.h

@@ -252,7 +252,7 @@ extern "C"
  * Public Function Prototypes
  ************************************************************************************/
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32L4 architectures must provide the following entry point.  This entry point
@@ -261,7 +261,7 @@ extern "C"
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void);
+void stm32l4_board_initialize(void);
 
 #undef EXTERN
 #if defined(__cplusplus)

configs/nucleo-l452re/src/stm32_boot.c

@@ -53,7 +53,7 @@
  ************************************************************************************/
 
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32 architectures must provide the following entry point.  This entry point
@@ -62,7 +62,7 @@
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void)
+void stm32l4_board_initialize(void)
 {
 #ifdef CONFIG_ARCH_LEDS
   /* Configure on-board LEDs if LED support has been selected. */

configs/nucleo-l452re/src/stm32_spi.c

@@ -117,7 +117,7 @@ void weak_function stm32l4_spiinitialize(void)
  *   are provided by common STM32 logic.  To use this common SPI logic on your
  *   board:
  *
- *   1. Provide logic in stm32l4_boardinitialize() to configure SPI chip select
+ *   1. Provide logic in stm32l4_board_initialize() to configure SPI chip select
  *      pins.
  *   2. Provide stm32l4_spi1/2/3select() and stm32l4_spi1/2/3status() functions in your
  *      board-specific logic.  These functions will perform chip selection and

configs/nucleo-l476rg/include/board.h

@@ -249,7 +249,7 @@ extern "C"
  * Public Function Prototypes
  ************************************************************************************/
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32L4 architectures must provide the following entry point.  This entry point
@@ -258,7 +258,7 @@ extern "C"
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void);
+void stm32l4_board_initialize(void);
 
 #undef EXTERN
 #if defined(__cplusplus)

configs/nucleo-l476rg/src/stm32_boot.c

@@ -64,7 +64,7 @@
  ************************************************************************************/
 
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32L4 architectures must provide the following entry point.  This entry point
@@ -73,7 +73,7 @@
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void)
+void stm32l4_board_initialize(void)
 {
   /* Configure on-board LEDs if LED support has been selected. */
 

configs/nucleo-l476rg/src/stm32_spi.c

@@ -126,7 +126,7 @@ void weak_function stm32l4_spiinitialize(void)
  *   are provided by common STM32 logic.  To use this common SPI logic on your
  *   board:
  *
- *   1. Provide logic in stm32l4_boardinitialize() to configure SPI chip select
+ *   1. Provide logic in stm32l4_board_initialize() to configure SPI chip select
  *      pins.
  *   2. Provide stm32l4_spi1/2/3select() and stm32l4_spi1/2/3status() functions in your
  *      board-specific logic.  These functions will perform chip selection and

configs/nucleo-l496zg/include/board.h

@@ -438,7 +438,7 @@ extern "C"
  ************************************************************************************/
 
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32 architectures must provide the following entry point.  This entry point
@@ -447,7 +447,7 @@ extern "C"
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void);
+void stm32l4_board_initialize(void);
 
 #undef EXTERN
 #if defined(__cplusplus)

configs/nucleo-l496zg/src/stm32_boot.c

@@ -53,7 +53,7 @@
  ************************************************************************************/
 
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32 architectures must provide the following entry point.  This entry point
@@ -62,7 +62,7 @@
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void)
+void stm32l4_board_initialize(void)
 {
 #ifdef CONFIG_ARCH_LEDS
   /* Configure on-board LEDs if LED support has been selected. */

configs/stm32l476-mdk/include/board.h

@@ -135,7 +135,7 @@ extern "C"
  * Public Function Prototypes
  ************************************************************************************/
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32L4 architectures must provide the following entry point.  This entry
@@ -144,7 +144,7 @@ extern "C"
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void);
+void stm32l4_board_initialize(void);
 
 #undef EXTERN
 #if defined(__cplusplus)

configs/stm32l476-mdk/src/stm32_boot.c

@@ -56,7 +56,7 @@
  ************************************************************************************/
 
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32L4 architectures must provide the following entry point.  This entry point
@@ -65,7 +65,7 @@
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void)
+void stm32l4_board_initialize(void)
 {
   /* Configure on-board LEDs if LED support has been selected. */
 

configs/stm32l476vg-disco/include/board.h

@@ -293,7 +293,7 @@ extern "C"
  * Public Function Prototypes
  ************************************************************************************/
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32L4 architectures must provide the following entry point.  This entry point
@@ -302,7 +302,7 @@ extern "C"
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void);
+void stm32l4_board_initialize(void);
 
 #undef EXTERN
 #if defined(__cplusplus)

configs/stm32l476vg-disco/src/stm32_boot.c

@@ -56,7 +56,7 @@
  ************************************************************************************/
 
 /************************************************************************************
- * Name: stm32l4_boardinitialize
+ * Name: stm32l4_board_initialize
  *
  * Description:
  *   All STM32L4 architectures must provide the following entry point.  This entry point
@@ -65,7 +65,7 @@
  *
  ************************************************************************************/
 
-void stm32l4_boardinitialize(void)
+void stm32l4_board_initialize(void)
 {
   /* Configure on-board LEDs if LED support has been selected. */