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Diffstat (limited to 'nuttx/arch/arm/src/kl/kl_start.c')
| -rw-r--r-- | nuttx/arch/arm/src/kl/kl_start.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/kl/kl_start.c b/nuttx/arch/arm/src/kl/kl_start.c new file mode 100644 index 000000000..7857cc01a --- /dev/null +++ b/nuttx/arch/arm/src/kl/kl_start.c @@ -0,0 +1,199 @@ +/**************************************************************************** + * arch/arm/src/kl/kl_start.c + * arch/arm/src/chip/kl_start.c + * + * Copyright (C) 2013 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 "kl_config.h" +#include "kl_lowputc.h" +//#include "kl_clockconfig.h" +#include "kl_userspace.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/* Memory Map: + * + * 0x0000:0000 - Beginning of FLASH. Address of exception vectors. + * 0x0001:ffff - End of flash (assuming 128KB of FLASH) + * 0x2000:0000 - Start of SRAM and start of .data (_sdata) + * - End of .data (_edata) abd start of .bss (_sbss) + * - End of .bss (_ebss) and bottom of idle stack + * - _ebss + CONFIG_IDLETHREAD_STACKSIZE = end of idle stack, + * start of heap + * 0x2000:3fff - End of SRAM and end of heap (assuming 16KB of SRAM) + */ + +#define IDLE_STACK ((uint32_t)&_ebss+CONFIG_IDLETHREAD_STACKSIZE-4) +#define HEAP_BASE ((uint32_t)&_ebss+CONFIG_IDLETHREAD_STACKSIZE-4) + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +const uint32_t g_idle_topstack = HEAP_BASE; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: showprogress + * + * Description: + * Print a character on the UART to show boot status. + * + ****************************************************************************/ + +#if defined(CONFIG_DEBUG) && defined(HAVE_SERIAL_CONSOLE) +# define showprogress(c) kl_lowputc((uint32_t)c) +#else +# define showprogress(c) +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +void iprintf(const char *string) +{ + while(*string != NULL) + kl_lowputc((char) *string++); +} + +/**************************************************************************** + * Name: _start + * + * Description: + * This is the reset entry point. + * + ****************************************************************************/ + +void __start(void) +{ + const uint32_t *src; + uint32_t *dest, i=0; + volatile unsigned int *SIM_COPC = ((volatile unsigned int *)0x40048100); + + /*acassis: disable SIM_COP*/ + *SIM_COPC = 0; + + /* Configure the uart so that we can get debug output as soon as possible */ + + kl_clockconfig(); + kl_lowsetup(); + //uart_init(); + showprogress('A'); + + /* Blink blue LED to indicate we are here */ + //for (; ; i++) + // blueled(i & 0x10000); + + /* 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'); + + /* For the case of the separate user-/kernel-space build, perform whatever + * platform specific initialization of the user memory is required. + * Normally this just means initializing the user space .data and .bss + * segments. + */ + +#ifdef CONFIG_NUTTX_KERNEL + kl_userspace(); + showprogress('E'); +#endif + + /* Initialize onboard resources */ + + kl_boardinitialize(); + showprogress('F'); + + /* Then start NuttX */ + + //iprintf("\r\nWelcome to NuttX!\r\n"); + + //showprogress('\r'); + //showprogress('\n'); + + iprintf("\r\n\r\n"); + + os_start(); + + /* Shoulnd't get here */ + + for(;;); +} + |