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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-05-08 21:12:33 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-05-08 21:12:33 +0000 |
commit | 77c4a4d3e9f5a8f9c8d6c921e05dfae965512117 (patch) | |
tree | 1fbdded94bf80f8b3710c7590573fff28c250a86 /nuttx/arch/arm/src/lm3s/lm3s_start.c | |
parent | 637a7d82473a76f00af93d16c38624b4960e8575 (diff) | |
download | px4-nuttx-77c4a4d3e9f5a8f9c8d6c921e05dfae965512117.tar.gz px4-nuttx-77c4a4d3e9f5a8f9c8d6c921e05dfae965512117.tar.bz2 px4-nuttx-77c4a4d3e9f5a8f9c8d6c921e05dfae965512117.zip |
lm3s6918 update
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1764 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm/src/lm3s/lm3s_start.c')
-rw-r--r-- | nuttx/arch/arm/src/lm3s/lm3s_start.c | 169 |
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(;;); +} |