Add a stub that can be used when networking is enabled, but there is no ethernet driver

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3368 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/common/up_etherstub.c

@@ -0,0 +1,86 @@
+/****************************************************************************
+ * arch/arm/src/common/up_etherstub.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "up_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_netinitialize (stub)
+ *
+ * Description:
+ *   This is a stub version os up_netinitialize.  Normally, up_netinitialize
+ *   is defined in board/up_network.c for board-specific ethernet
+ *   implementations, or chip/xyx_ethernet.c for chip-specific ethernet
+ *   implementations.  The stub version here is used in the cornercase where
+ *   the network is enable yet there is no ethernet driver to be initialized.
+ *   In this case, up_initialize will still try to call up_netinitialize()
+ *   when one does not exist.  This cornercase would occur if, for example,
+ *   only a USB network interface is being used or perhaps if a SLIP is
+ *   being used).
+ *
+ *   In the long run, it might be better to have some kind of CONFIG_NO_ETHERNET
+ *   to suppress the call to up_netinitialize() in up_initialize().  Then
+ *   this stub would not be needed.
+ *
+ ****************************************************************************/
+
+void up_netinitialize(void)
+{
+}

arch/arm/src/common/up_internal.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * common/up_internal.h
  *
- *   Copyright (C) 2007-2010 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2011 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -259,7 +259,11 @@ extern void up_ledoff(int led);
 # define up_ledoff(led)
 #endif
 
-/* Defined in board/up_network.c */
+/* Defined in board/up_network.c for board-specific ethernet implementations,
+ * or chip/xyx_ethernet.c for chip-specific ethernet implementations, or
+ * common/up_etherstub.c for a cornercase where the network is enable yet
+ * there is no ethernet driver to be initialized.
+ */
 
 #ifdef CONFIG_NET
 extern void up_netinitialize(void);

arch/arm/src/lpc17xx/Make.defs

@@ -48,6 +48,12 @@ CMN_CSRCS	= up_assert.c up_blocktask.c up_copystate.c up_createstack.c \
 		  up_sigdeliver.c up_unblocktask.c up_usestack.c up_doirq.c \
 		  up_hardfault.c up_svcall.c
 
+ifeq ($(CONFIG_NET),y)
+ifneq ($(CONFIG_LPC17_ETHERNET),y)
+CMN_CSRCS	+= up_etherstub.c
+endif
+endif
+
 # Required LPC17xx files
 
 CHIP_ASRCS	=
@@ -77,6 +83,8 @@ ifeq ($(CONFIG_LPC17_GPDMA),y)
 CHIP_CSRCS	+= lpc17_gpdma.c
 endif
 
-ifdef CONFIG_NET
+ifeq ($(CONFIG_NET),y)
+ifeq ($(CONFIG_LPC17_ETHERNET),y)
 CHIP_CSRCS	+= lpc17_ethernet.c
 endif
+endif