184 lines
5.8 KiB
C
184 lines
5.8 KiB
C
/****************************************************************************
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* arch/arm/src/sam34/sam_start.c
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*
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* Copyright (C) 2009-2010, 2012-2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/init.h>
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#include <arch/board/board.h>
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#include "up_arch.h"
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#include "up_internal.h"
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#include "sam_clockconfig.h"
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#include "sam_lowputc.h"
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#include "sam_userspace.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if defined(CONFIG_WDT_ENABLED_ON_RESET) && defined(CONFIG_WDT_DISABLE_ON_RESET)
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# define NEED_WDT_DISABLE
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: showprogress
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*
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* Description:
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* Print a character on the UART to show boot status.
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*
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****************************************************************************/
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#ifdef CONFIG_DEBUG
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# define showprogress(c) up_lowputc(c)
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#else
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# define showprogress(c)
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: _start
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*
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* Description:
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* This is the reset entry point.
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*
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****************************************************************************/
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void __start(void)
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{
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const uint32_t *src;
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uint32_t *dest;
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/* Clear .bss. We'll do this inline (vs. calling memset) just to be
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* certain that there are no issues with the state of global variables.
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*/
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for (dest = &_sbss; dest < &_ebss; )
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{
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*dest++ = 0;
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}
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/* Move the initialized data section from his temporary holding spot in
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* FLASH into the correct place in SRAM. The correct place in SRAM is
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* give by _sdata and _edata. The temporary location is in FLASH at the
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* end of all of the other read-only data (.text, .rodata) at _eronly.
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*/
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for (src = &_eronly, dest = &_sdata; dest < &_edata; )
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{
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*dest++ = *src++;
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}
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#ifdef NEED_WDT_DISABLE
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/* Disable the watchdog timer */
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# warning Missing logic
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#endif
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/* Copy any necessary code sections from FLASH to RAM. The correct
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* destination in SRAM is geive by _sramfuncs and _eramfuncs. The
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* temporary location is in flash after the data initalization code
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* at _framfuncs. This must be done before sam_clockconfig() can be
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* called (at least for the SAM4L family).
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*/
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#ifdef CONFIG_ARCH_RAMFUNCS
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for (src = &_framfuncs, dest = &_sramfuncs; dest < &_eramfuncs; )
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{
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*dest++ = *src++;
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}
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#endif
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/* Configure the uart so that we can get debug output as soon as possible */
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sam_clockconfig();
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sam_lowsetup();
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showprogress('A');
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/* Perform early serial initialization */
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#ifdef USE_EARLYSERIALINIT
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up_earlyserialinit();
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#endif
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showprogress('B');
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/* For the case of the separate user-/kernel-space build, perform whatever
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* platform specific initialization of the user memory is required.
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* Normally this just means initializing the user space .data and .bss
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* segements.
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*/
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#ifdef CONFIG_NUTTX_KERNEL
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sam_userspace();
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showprogress('C');
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#endif
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/* Initialize onboard resources */
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sam_boardinitialize();
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showprogress('D');
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/* Then start NuttX */
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showprogress('\r');
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showprogress('\n');
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os_start();
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/* Shouldn't get here */
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for(;;);
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}
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