diff options
Diffstat (limited to 'nuttx/arch/arm/src/lm/lm3s_start.c')
-rw-r--r-- | nuttx/arch/arm/src/lm/lm3s_start.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/lm/lm3s_start.c b/nuttx/arch/arm/src/lm/lm3s_start.c new file mode 100644 index 000000000..4dfe92844 --- /dev/null +++ b/nuttx/arch/arm/src/lm/lm3s_start.c @@ -0,0 +1,154 @@ +/**************************************************************************** + * arch/arm/src/lm/lm3s_start.c + * arch/arm/src/chip/lm3s_start.c + * + * Copyright (C) 2009, 2012 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdint.h> +#include <assert.h> +#include <debug.h> + +#include <nuttx/init.h> +#include <arch/board/board.h> + +#include "up_arch.h" +#include "up_internal.h" + +#include "lm_lowputc.h" +#include "lm_syscontrol.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +extern void lm3s_vectors(void); + +/**************************************************************************** + * 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 + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: _start + * + * Description: + * This is the reset entry point. + * + ****************************************************************************/ + +void __start(void) +{ + const uint32_t *src; + uint32_t *dest; + + /* Configure the uart so that we can get debug output as soon as possible */ + + up_clockconfig(); + 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 USE_EARLYSERIALINIT + up_earlyserialinit(); +#endif + showprogress('D'); + + /* Initialize onboard resources */ + + lm3s_boardinitialize(); + showprogress('E'); + + /* Then start NuttX */ + + showprogress('\r'); + showprogress('\n'); + os_start(); + + /* Shoulnd't get here */ + + for(;;); +} |