IAR怎么在启动程序里面添加关闭看门狗代码
看网上的资料教这么做：
 解决办法：

方法一 将一些变量（主要是大全局数组）定义成 no init类型
方法二 修改IAR的cstartup.s43程序，具体方法如下：（iar310a为例）
1 将cstartup.s43程序加载到用户自己的项目中，cstartup.s43在iar310a的路径如下$TOOLKIT_DIR$srcLIB
2 修改cstartup.s43中的__program_start子程序，加入关闭看门狗的命令 MOV #0x5A80,&0x0120
3 在Project->Options->Linker->Config页中选择Override default programe ,并将Entry lib 设置成 __program_start
 
按照上面的指示：我在文件中加入：MOV.W #WDTPW+WDTHOLD , &WDTCTL 
（也尝试过，在我的工程中添加#define DISABLE_WATCHDOG 语句，均无效果；也尝试过，直接注释掉调件编译，让其直接编译，也没有效果：
//#ifdef DISABLE_WATCHDOG
  MOV #WDTPW + WDTHOLD, &WDTCTL
//#endif


但是我的IAR 是6.0版的，我用的是MSP430，没有看到Entry lib ，取而代之的是Entry symb 所以我选择了 Entry symb ：__program_start





但是没有任何效果,什么原因？？


cstartup.s43文件内容：
/**************************************************
 *
 * System initialization code for the MSP430 IAR C/EC++ Compiler.
 *
 * Copyright ?2002-2008 IAR Systems AB.
 *
 * $Revision: 5271 $
 *
 **************************************************/

//
// There are two libraries provided with compilers from IAR Systems,
// CLib and DLib. This file is designed to work with both libraries.
// Some parts of it is DLib-specific. However, those parts will not
// be included when building an application using CLib.
//

//
// Please define one of the following preprocessor symbols in order to
// customize the system initialization process.
//
// IGNORE_SEG_INIT -- To remove segment initialization
// IGNORE_DATA16_DATA -- To remove segment initialization of DATA16 data
// IGNORE_DATA20_DATA -- To remove segment initialization of DATA20 data
// IGNORE_RAMFUNC_INIT -- To remove segment initialization of ramfunc code
// DISABLE_WATCHDOG -- To disable the watchdog
//
// Note: In the current version the symbols "IGNORE_SEG_INIT" and
// "IGNORE_DATA16_DATA" will perform the same task. However, both are
// supported in order to be compatible with other IAR Compilers.
//
// Note: To disable the watchdog, a device-specific header file will
// be included.
//

#include "macros.m43"
#include "cfi.m43"

#ifdef DISABLE_WATCHDOG
#include "msp430.h"
#endif


#define XRSEGCSTART RSEG CSTART:CODE:NOROOT(1)

  XCFI_NAMES libNames
  XCFI_COMMON libCommon, libNames


// ---------------------------------------------------------
// The cstartup code -- call __low_level_init, perform initialization,
// call constructors and call main. If main returns the exit system
// is started.
//

  MODULE ?cstart

//
// Ensure that this is build with the same "positions independent
// code" settings as the compiler uses.
//

  XPICRTMODEL


//
// Forward declarations of segments.
//

  RSEG HEAP:DATA:NOROOT(1)
  RSEG CSTACK:DATA:NOROOT

  RSEG DATA16_Z:DATA:NOROOT
  RSEG DATA16_I:DATA:NOROOT
  RSEG DATA16_ID:CONST:NOROOT
  RSEG CODE_I:DATA:NOROOT
  RSEG CODE_ID:CONST:NOROOT
#if __CORE__==__430X_CORE__
  RSEG DATA20_Z:DATA:NOROOT
  RSEG DATA20_I:DATA:NOROOT
  RSEG DATA20_ID:CONST:NOROOT
#endif

// ---------------------------------------------------------
// System initialization.
//

  XRSEGCSTART
  PUBLIC __program_start

  EXTERN ?reset_vector
  REQUIRE ?reset_vector

__program_start:

  PUBLIC ?cstart_begin
?cstart_begin:

  // --------------------
  // Turn off the watchdog.
  //
  // Note: This is excluded by default. Please define
  // DISABLE_WATCHDOG to include it.
  //

#ifdef DISABLE_WATCHDOG

  MOV #WDTPW + WDTHOLD, &WDTCTL
#endif

  // --------------------
  // Initialize SP to point to the top of the stack.
  //
  MOV.W #WDTPW+WDTHOLD , &WDTCTL MOV #SFE(CSTACK), SP

  //
  // Ensure that main is called.
  //
  REQUIRE ?cstart_call_main


// -----------------------------------------------
// Call __low_level_init to perform initialization before initializing
// segments and calling main. If the function returns 0 no segment
// initialization should take place.
//
// Link with your own version of __low_level_init to override the
// default action: to do nothing but return 1.
//

  XRSEGCSTART

  PUBLIC ?cstart_call_low_level_init
  EXTERN __low_level_init

?cstart_call_low_level_init:
  XCALL #__low_level_init
  CMP #0, W0
  JEQ ?cstart_call_main


// -----------------------------------------------
// Segment initialization:
//
// xxx_Z -- uninitialized data that are filled with zeros.
// xxx_I -- initialized data that gets the values from the corresponding
// xxx_ID segment.
//

#ifndef IGNORE_SEG_INIT


  // --------------------
  // Initialize code for __ramfunc functions.
  //

  XRSEGCSTART
  PUBLIC ?cstart_init_copy_ramfunc

?cstart_init_copy_ramfunc:

#ifndef IGNORE_RAMFUNC_INIT

#ifndef REGISTER_MODEL_REG20

  MOV #SFB CODE_I, CW0
  MOV #SFB CODE_ID, CW1

  MOV #sizeof CODE_I, CW2

  XCALL #__data16_memcpy

#else // MSP430X with 20 bit pointers.

  EXTERN __data20_memcpy

  MOVA #SFB CODE_I, CW0
  MOVA #SFB CODE_ID, CW1
  MOV.W #LWRD(sizeof CODE_I), L1L
  MOV.W #HWRD(sizeof CODE_I), L1H

  XCALL #__data20_memcpy


#endif // REGISTER_MODEL_REG20

#endif // IGNORE_RAMFUNC_INIT


  // --------------------
  // Initialize data16
  //

#ifndef IGNORE_DATA16_DATA

  //
  // Clear DATA16_Z.
  //

  XRSEGCSTART
  PUBLIC ?cstart_init_zero
  EXTERN __data16_memzero

?cstart_init_zero:
  MOV #SFB DATA16_Z, CW0
  MOV #sizeof DATA16_Z, CW1

  XCALL #__data16_memzero


  //
  // Copy DATA16_ID to DATA16_I
  //

  XRSEGCSTART
  PUBLIC ?cstart_init_copy
  EXTERN __data16_memcpy

?cstart_init_copy:
  MOV #SFB DATA16_I, CW0
  MOV #SFB DATA16_ID, CW1

  MOV #sizeof DATA16_I, CW2

  XCALL #__data16_memcpy

#endif // IGNORE_DATA16_DATA


  // --------------------
  // Data20
  //

#if __CORE__==__430X_CORE__


#ifndef IGNORE_DATA20_DATA

  //
  // Clear DATA20_Z.
  //

  XRSEGCSTART
  PUBLIC ?cstart_init_zero20
  EXTERN __data20_memzero

?cstart_init_zero20:
  MOVA #SFB DATA20_Z,W0
  MOV.W #LWRD(sizeof DATA20_Z), L1L
  MOV.W #HWRD(sizeof DATA20_Z), L1H

  XCALL #__data20_memzero


  //
  // Copy DATA20_ID to DATA20_I
  //

  XRSEGCSTART
  PUBLIC ?cstart_init_copy20
  EXTERN __data20_memcpy

?cstart_init_copy20:
  MOVA #SFB DATA20_I, CW0
  MOVA #SFB DATA20_ID, CW1
  MOV.W #LWRD(sizeof DATA20_I), L1L
  MOV.W #HWRD(sizeof DATA20_I), L1H

  XCALL #__data20_memcpy

#endif // IGNORE_DATA16_DATA

#endif // MSP430X

#endif // IGNORE_SEG_INIT



// -----------------------------------------------
// Call constructors of static objects.
//

  RSEG DIFUNCT:CONST:NOROOT(1)
  XRSEGCSTART
  PUBLIC ?cstart_call_ctors

  EXTERN __call_ctors

?cstart_call_ctors:

#ifdef REGISTER_MODEL_REG20

  MOVA #SFB DIFUNCT, CW0
  MOVA #SFE DIFUNCT, CW1

#else /* REGISTER_MODEL_REG20 */

  MOV.W #SFB DIFUNCT, CW0
  MOV.W #SFE DIFUNCT, CW1

#endif /* REGISTER_MODEL_REG20 */

  XCALL #__call_ctors


// -----------------------------------------------
// Call main() with no arguments and then exit using the return value
// of main as the parameter.
//

  XRSEGCSTART
  PUBLIC ?cstart_call_main

  EXTERN main
  EXTERN exit

?cstart_call_main:
  XCALL #main
  XCALL #exit

  PUBLIC ?cstart_end
?cstart_end:

  // Note: "ENDMOD label" means code that this module is the
  // start of the application.
  ENDMOD __program_start




// ---------------------------------------------------------
// __low_level_init
//
// The only action of this default version of __low_level_init is to
// return 1. By doing so it signals that normal initialization of data
// segments should be done.
//
// A customized version of __low_level_init may be created in order to
// perform initialization before initializing segments and calling main
// and/or to skip initialization of data segments under certain
// circumstances.
//
// For further details see sample file lowinit.c
//


  MODULE lowinit

  PUBLIC __low_level_init

  RSEG CODE:CODE:NOROOT(1)

__low_level_init:
  MOV #1, W0 // By returning 1 this function
  XRET // indicates that the normal
  // initialization should take place

  ENDMOD


// ---------------------------------------------------------
// Define reset vector.
//

  MODULE ?reset_vector

  RSEG RESET:CONST:NOROOT(1)
  PUBLIC ?reset_vector
  EXTERN __program_start

?reset_vector:
  DC16 __program_start

  ENDMOD

  END
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