lm3s6918 update

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1764 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 169 insertions, 0 deletions

diff --git a/nuttx/arch/arm/src/lm3s/lm3s_start.c b/nuttx/arch/arm/src/lm3s/lm3s_start.c
new file mode 100644
index 000000000..8894117dc
--- /dev/null
+++ b/nuttx/arch/arm/src/lm3s/lm3s_start.c
@@ -0,0 +1,169 @@
+/****************************************************************************
+ * arch/arm/src/lm3s/lm3s_start.c
+ * arch/arm/src/chip/lm3s_start.c
+ *
+ *   Copyright (C) 2009 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 <sys/types.h>
+
+#include <assert.h>
+#include <debug.h>
+
+#include <nuttx/init.h>
+
+#include "up_arch.h"
+#include "up_internal.h"
+
+/****************************************************************************
+ * Private Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/* These values are setup by the linker script */
+
+extern const uint32 _eronly;    /* End of read only (.text + .rodata) */
+extern uint32 _sdata;           /* Start of .data */
+extern uint32 _edata;           /* End+1 of .data */
+extern uint32 _sbss;            /* Start of .bss */
+extern uint32 _ebss;            /* End+1 of .bss */
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: showprogress
+ *
+ * Description:
+ *   Print a character on the UART to show boot status.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_DEBUG
+#  define showprogress(c) up_lowputc(c)
+#else
+#  define showprogress(c)
+#endif
+
+/****************************************************************************
+ * Name: up_lowsetup
+ *
+ * Description:
+ *   Set up initial clocking
+ *
+ ****************************************************************************/
+
+static inline void up_lowsetup(void)
+{
+  up_clockconfig();
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: _start
+ *
+ * Description:
+ *   This is the reset entry point.
+ *
+ ****************************************************************************/
+
+void _start(void)
+{
+  const uint32 *src;
+  uint32 *dest;
+
+  /* Configure the uart so that we can get debug output as soon as possible */
+
+  up_lowsetup();
+  showprogress('A');
+
+  /* Clear .bss.  We'll do this inline (vs. calling memset) just to be
+   * certain that there are no issues with the state of global variables.
+   */
+
+  for (dest = &_sbss; dest < &_ebss; )
+    {
+      *dest++ = 0;
+    }
+  showprogress('B');
+
+  /* Move the intialized data section from his temporary holding spot in
+   * FLASH into the correct place in SRAM.  The correct place in SRAM is
+   * give by _sdata and _edata.  The temporary location is in FLASH at the
+   * end of all of the other read-only data (.text, .rodata) at _eronly.
+   */
+
+  for (src = &_eronly, dest = &_sdata; dest < &_edata; )
+    {
+      *dest++ = *src++;
+    }
+  showprogress('C');
+
+  /* Perform early serial initialization */
+
+#ifdef CONFIG_USE_EARLYSERIALINIT
+  up_earlyserialinit();
+#endif
+  showprogress('D');
+
+  /* Initialize onboard LEDs */
+
+#ifdef CONFIG_ARCH_LEDS
+  up_ledinit();
+#endif
+  showprogress('E');
+
+  /* Then start NuttX */
+
+  showprogress('\n');
+  os_start();
+
+  /* Shoulnd't get here */
+
+  for(;;);
+}