TMS320F280039C: RAM specifies the variable strApp2BootData, switch from APP to Boot, and the variable strApp2BootData will be cleared before entering the Main function.

Shaoxing Ke

Part Number: TMS320F280039C

Hi Experts,

I am asking for my customer urgently. Thanks.

They are developed their own bootloader. And RAM specifies the variable strApp2BootData when jump from APP to Boot, and the variable strApp2BootData will be cleared before entering the Main function. we don't quite understand why it will be clear?

#1.If we use the variable strApp2BootData to do judge, the variable strApp2BootData will be cleared as below figure when code jump from APP to BOOT. You can see the 0x00000400 address no data and cleared.

#2.If we directly to access the 0x00000400 absolute address, the data would still you can see the below figure.

In addition, Boot Project and APP Project, define this variable at the same time, define the same RAM address. And the strApp2BootData is used by judging the upgrade operation.

They use the asm(LB "Program entry address") to jump from BOOT to APP, or also jump from APP to BOOT.

what we've done:

1.We check the RESC register, chip not reset, RAM data for strApp2BootData should not be cleared;

2.Direct operate the absolute address data exists, but through variable assignment, the data is cleared, why?

3.We check the usage- assign the fixed addresses for the variables in RAM, correct. Meanwhile, attached files about two project cmd.

Fullscreen 280039C_APP-CMD.txt Download

MEMORY
{
   
  
PAGE 0 :
   RAMM0            : origin = 0x00000128, length = 0x000002D8
   RESET            : origin = 0x003FFFC0, length = 0x00000002
  

 RAMLS_Prog          : origin = 0x00008000, length = 0x00001800
 //  RAMLS0           : origin = 0x00008000, length = 0x00000800   cla 程序空间
 //   RAMLS1           : origin = 0x00008800, length = 0x00000800
//   RAMLS2           : origin = 0x00009000, length = 0x00000800


//   RAMGS_Prog           : origin = 0x0000C000, length = 0x00003FF8
RAMGS_Prog           : origin = 0x0000D000, length = 0x00002FF8
// RAMGS1           : origin = 0x0000D000, length = 0x00001000
// RAMGS2           : origin = 0x0000E000, length = 0x00001000
// RAMGS3           : origin = 0x0000F000, length = 0x00000FF8




 //  SECURE_ROM       : origin = 0x003F2000, length = 0x00006000
//  BOOTROM          : origin = 0x003F8000, length = 0x00007FC0
 

   /* Flash sectors */
   /* BANK 0 */
   

 //  BEGIN            : origin = 0x00080000, length = 0x00000004
    FLASH_BOOT       : origin = 0x080004, length = 0x003FFC
   
 //  FLASH_BANK0_SEC0  : origin = 0x080002, length = 0x000FFE
 //  FLASH_BANK0_SEC1  : origin = 0x081000, length = 0x001000
 //  FLASH_BANK0_SEC2  : origin = 0x082000, length = 0x001000
 //  FLASH_BANK0_SEC3  : origin = 0x083000, length = 0x001000
 
 
 
    BEGIN            : origin = 0x084000, length = 0x000004
   AppFlagW	       : origin = 0x084004, length = 0x000004	//App程序存在标志
   FLASH_APP           : origin = 0x084008, length = 0x01AFF4	/* on-chip Flash */
   FLASHEND            : origin = 0x09EFFC, length = 0x000004   //APP程序结束标志

 
 
 
 //  FLASH_BANK0_SEC4  : origin = 0x084000, length = 0x001000
//   FLASH_BANK0_SEC5  : origin = 0x085000, length = 0x001000
//   FLASH_BANK0_SEC6  : origin = 0x086000, length = 0x001000
//   FLASH_BANK0_SEC7  : origin = 0x087000, length = 0x001000
//   FLASH_BANK0_SEC8  : origin = 0x088000, length = 0x001000
//   FLASH_BANK0_SEC9  : origin = 0x089000, length = 0x001000
//   FLASH_BANK0_SEC10 : origin = 0x08A000, length = 0x001000
//   FLASH_BANK0_SEC11 : origin = 0x08B000, length = 0x001000
//   FLASH_BANK0_SEC12 : origin = 0x08C000, length = 0x001000
//   FLASH_BANK0_SEC13 : origin = 0x08D000, length = 0x001000
 //  FLASH_BANK0_SEC14 : origin = 0x08E000, length = 0x001000
//   FLASH_BANK0_SEC15 : origin = 0x08F000, length = 0x001000





   /* BANK 1 */
 //  FLASH_BANK1_SEC0  : origin = 0x090000, length = 0x001000
  // FLASH_BANK1_SEC1  : origin = 0x091000, length = 0x001000
 //  FLASH_BANK1_SEC2  : origin = 0x092000, length = 0x001000
//   FLASH_BANK1_SEC3  : origin = 0x093000, length = 0x001000
 //  FLASH_BANK1_SEC4  : origin = 0x094000, length = 0x001000
 //  FLASH_BANK1_SEC5  : origin = 0x095000, length = 0x001000
 //  FLASH_BANK1_SEC6  : origin = 0x096000, length = 0x001000
//   FLASH_BANK1_SEC7  : origin = 0x097000, length = 0x001000
//   FLASH_BANK1_SEC8  : origin = 0x098000, length = 0x001000
//   FLASH_BANK1_SEC9  : origin = 0x099000, length = 0x001000
 //  FLASH_BANK1_SEC10 : origin = 0x09A000, length = 0x001000
 //  FLASH_BANK1_SEC11 : origin = 0x09B000, length = 0x001000
 //  FLASH_BANK1_SEC12 : origin = 0x09C000, length = 0x001000
 //  FLASH_BANK1_SEC13 : origin = 0x09D000, length = 0x001000
 //  FLASH_BANK1_SEC14 : origin = 0x09E000, length = 0x001000
 //  FLASH_BANK1_SEC15 : origin = 0x09F000, length = 0x001000

  /* BANK 2 */
   FLASH_BANK2_SEC0  : origin = 0x0A0000, length = 0x001000
   FLASH_BANK2_SEC1  : origin = 0x0A1000, length = 0x001000
   FLASH_BANK2_SEC2  : origin = 0x0A2000, length = 0x001000
   FLASH_BANK2_SEC3  : origin = 0x0A3000, length = 0x001000
   FLASH_BANK2_SEC4  : origin = 0x0A4000, length = 0x001000
   FLASH_BANK2_SEC5  : origin = 0x0A5000, length = 0x001000
   FLASH_BANK2_SEC6  : origin = 0x0A6000, length = 0x001000
   FLASH_BANK2_SEC7  : origin = 0x0A7000, length = 0x001000
   FLASH_BANK2_SEC8  : origin = 0x0A8000, length = 0x001000
   FLASH_BANK2_SEC9  : origin = 0x0A9000, length = 0x001000
   FLASH_BANK2_SEC10 : origin = 0x0AA000, length = 0x001000
   FLASH_BANK2_SEC11 : origin = 0x0AB000, length = 0x001000
   FLASH_BANK2_SEC12 : origin = 0x0AC000, length = 0x001000
   FLASH_BANK2_SEC13 : origin = 0x0AD000, length = 0x001000
   FLASH_BANK2_SEC14 : origin = 0x0AE000, length = 0x001000
   FLASH_BANK2_SEC15 : origin = 0x0AF000, length = 0x000FF0

// FLASH_BANK0_SEC15_RSVD     : origin = 0x0AFFF0, length = 0x000010  /* Reserve and do not use for code as per the errata advisory "Memory: Prefetching Beyond Valid Memory" */

PAGE 1 :
   BOOT_RSVD  		: origin = 0x00000002, length = 0x00000126

   App2Boot	  	  	: origin = 0x00000400, length = 0x00000010
   RAMM1			: origin = 0x00000410, length = 0x000003E8
 // RAMM1_RSVD       : origin = 0x000007F8, length = 0x00000008 /* Reserve and do not use for code as per the errata advisory "Memory: Prefetching Beyond Valid Memory" */


   RAMLS_Data      	: origin = 0x00009800, length = 0x00001000
// RAMLS3           : origin = 0x00009800, length = 0x00000800  // cla 数据空间
// RAMLS4           : origin = 0x0000A000, length = 0x00000800


//   RAMGS_Data          : origin = 0x0000A800, length = 0x00001800
   RAMGS_Data		: origin = 0x0000A800, length = 0x00002800
// RAMLS5           : origin = 0x0000A800, length = 0x00000800 //cpu 数据空间
// RAMLS6           : origin = 0x0000B000, length = 0x00000800
// RAMLS7           : origin = 0x0000B800, length = 0x00000800
// RAMGS0           : origin = 0x0000C000, length = 0x00001000


   CLA1_MSGRAMLOW   : origin = 0x001480, length = 0x000080
   CLA1_MSGRAMHIGH  : origin = 0x001500, length = 0x000080
}


SECTIONS
{
  codestart           : > BEGIN              PAGE = 0

   .text               : > FLASH_APP,         PAGE = 0
   .cinit              : > FLASH_APP,         PAGE = 0
   .switch             : > FLASH_APP,         PAGE = 0


   .stack              : > RAMM1              PAGE = 1



 //  .pinit              : > FLASH_APP,         PAGE = 0, ALIGN(4)
 //  .ebss               : > RAMGS_Data,        PAGE = 1
 //  .esysmem            : > RAMGS_Data,        PAGE = 1
 //  .cio                : > RAMGS_Prog,        PAGE = 0, ALIGN(4)
 //  .econst             : > FLASH_APP,         PAGE = 0, ALIGN(4)



#if defined(__TI_EABI__)

   .bss             : > RAMGS_Data,        PAGE = 1
   .const           : > FLASH_APP,         PAGE = 0
   .data            : > RAMGS_Data,        PAGE = 1
   .init_array      : > FLASH_APP,         PAGE = 0


   .bss:output      : > RAMGS_Data,        PAGE = 1
   .bss:cio         : > RAMGS_Data,        PAGE = 1
   .sysmem          : > RAMGS_Data,        PAGE = 1

#else
   .pinit           : > FLASH_APP,         PAGE = 0

   .econst          : > FLASH_APP,         PAGE = 0
   .cio             : > RAMGS_Prog,        PAGE = 0
   .ebss            : > RAMGS_Data,        PAGE = 1
   .esysmem         : > RAMGS_Data,        PAGE = 1

#endif

   AppFlag	    	   : > AppFlagW   		  PAGE = 0		/* XW */
   flashEnd	   	       : > FLASHEND           PAGE = 0
   App2BootData	       : > App2Boot    		  PAGE = 1

   .reset              : > RESET,             PAGE = 0, TYPE = DSECT /* not used, */
   
   CLA1mathTables    : > RAMLS_Data,                 PAGE = 1

#if defined(__TI_EABI__)

 .TI.ramfunc        : LOAD = FLASH_APP,
	                  RUN = RAMGS_Prog
	                  LOAD_START(RamfuncsLoadStart),
	                  LOAD_SIZE(RamfuncsLoadSize),
	                  LOAD_END(RamfuncsLoadEnd),
	                  RUN_START(RamfuncsRunStart),
	                  RUN_SIZE(RamfuncsRunSize),
	                  RUN_END(RamfuncsRunEnd),
	                  ALIGN(4)
#else
   .TI.ramfunc      : LOAD = FLASH_APP,
                      RUN = RAMGS_Prog
                      LOAD_START(_RamfuncsLoadStart),
                      LOAD_SIZE(_RamfuncsLoadSize),
                      LOAD_END(_RamfuncsLoadEnd),
                      RUN_START(_RamfuncsRunStart),
                      RUN_SIZE(_RamfuncsRunSize),
                      RUN_END(_RamfuncsRunEnd),
                      ALIGN(4)
#endif


/*

 #if defined(__TI_EABI__)
 .TI.ramfunc         : LOAD = FLASH_APP,
                     RUN = RAMGS_Prog
                     LOAD_START(RamConstLoadStart),
                     LOAD_SIZE(RamConstLoadSize),
                     LOAD_END(RamConstLoadEnd),
                     RUN_START(RamConstRunStart),
                     RUN_SIZE(RamConstRunSize),
                     RUN_END(RamConstRunEnd),
                     PAGE = 0, ALIGN(4)
#else
 .TI.ramfunc         : LOAD = FLASH_APP,
                     RUN = RAMGS_Prog
                     LOAD_START(_RamConstLoadStart),
                     LOAD_SIZE(_RamConstLoadSize),
                     LOAD_END(_RamConstLoadEnd),
                     RUN_START(_RamConstRunStart),
                     RUN_SIZE(_RamConstRunSize),
                     RUN_END(_RamConstRunEnd),
                     PAGE = 0, ALIGN(4)
#endif


*/


  //Load tables to Flash and copy over to RAM
   //
#if defined(__TI_EABI__)
   CLA1mathTables    :  LOAD = FLASH_APP,
                        RUN = RAMLS_Data,
                        RUN_START(CLA1mathTablesRunStart),
                        LOAD_START(CLA1mathTablesLoadStart),
                        LOAD_SIZE(CLA1mathTablesLoadSize),
                        PAGE = 1
#else
   CLA1mathTables    :  LOAD = FLASH_APP,
                        RUN = RAMLS_Data,
                        RUN_START(_CLA1mathTablesRunStart),
                        LOAD_START(_CLA1mathTablesLoadStart),
                        LOAD_SIZE(_CLA1mathTablesLoadSize),
                        PAGE = 1
#endif





#if defined(__TI_EABI__)
    /* CLA specific sections */
    Cla1Prog        : LOAD = FLASH_APP,
                      RUN = RAMLS_Prog,
                      LOAD_START(Cla1ProgLoadStart),
                      RUN_START(Cla1ProgRunStart),
                      LOAD_SIZE(Cla1ProgLoadSize),
                      PAGE = 0, ALIGN(4)
#else
    /* CLA specific sections */
    Cla1Prog        : LOAD = FLASH_APP,
                      RUN = RAMLS_Prog,
                      LOAD_START(_Cla1ProgLoadStart),
                      RUN_START(_Cla1ProgRunStart),
                      LOAD_SIZE(_Cla1ProgLoadSize),
                      PAGE = 0, ALIGN(4)
#endif



/******

#if defined(__TI_EABI__)
   .const_cla      : LOAD = FLASH_APP,
                      RUN = RAMLS_Prog,
                      RUN_START(Cla1ConstRunStart),
                      LOAD_START(Cla1ConstLoadStart),
                      LOAD_SIZE(Cla1ConstLoadSize),
                      PAGE = 0, ALIGN(4)
#else
   .const_cla      : LOAD = FLASH_APP,
                      RUN = RAMLS_Prog,
                      RUN_START(_Cla1ConstRunStart),
                      LOAD_START(_Cla1ConstLoadStart),
                      LOAD_SIZE(_Cla1ConstLoadSize),
                      PAGE = 0, ALIGN(4)
#endif

*******/


    Cla1ToCpuMsgRAM  : > CLA1_MSGRAMLOW ,  PAGE = 1
    CpuToCla1MsgRAM  : > CLA1_MSGRAMHIGH,  PAGE = 1


    .scratchpad      : > RAMLS_Data,       PAGE = 1
    .bss_cla         : > RAMLS_Data,       PAGE = 1
    .const_cla       : > RAMLS_Data,       PAGE = 1

    Cla1DataRam      : > RAMLS_Data,       PAGE = 1
    cla_shared       : > RAMLS_Data,       PAGE = 1
  //Cla1Data		 : > RAMLS_Data,       PAGE = 1
    CLADataLS1		 : > RAMLS_Data,       PAGE = 1


   /* Allocate IQ math areas: */
   IQmath			   : > FLASH_APP, PAGE = 0, ALIGN(4)            /* Math Code */
   IQmathTables		   : > FLASH_APP, PAGE = 0, ALIGN(4)

}

/*
//===========================================================================
// End of file.
//===========================================================================
*/

Fullscreen 280039C_BOOT-CMD.txt Download

MEMORY
{
   
  
PAGE 0 :
   RAMM0            : origin = 0x00000128, length = 0x000002D8
   RESET            : origin = 0x003FFFC0, length = 0x00000002
  

 RAMLS_Prog          : origin = 0x00008000, length = 0x00001800
 //  RAMLS0           : origin = 0x00008000, length = 0x00000800   cla 程序空间
 //   RAMLS1           : origin = 0x00008800, length = 0x00000800
//   RAMLS2           : origin = 0x00009000, length = 0x00000800


   RAMGS_Prog           : origin = 0x0000C000, length = 0x00003FF8
// RAMGS0           : origin = 0x0000C000, length = 0x00001000
// RAMGS1           : origin = 0x0000D000, length = 0x00001000
// RAMGS2           : origin = 0x0000E000, length = 0x00001000
// RAMGS3           : origin = 0x0000F000, length = 0x00000FF8




 //  SECURE_ROM       : origin = 0x003F2000, length = 0x00006000
//  BOOTROM          : origin = 0x003F8000, length = 0x00007FC0
 

   /* Flash sectors */
   /* BANK 0 */
   
   
   BEGIN            : origin = 0x00080000, length = 0x00000004
   FLASH_BOOT       : origin = 0x080004, length = 0x003FFC
   
 //  FLASH_BANK0_SEC0  : origin = 0x080002, length = 0x000FFE
 //  FLASH_BANK0_SEC1  : origin = 0x081000, length = 0x001000
 //  FLASH_BANK0_SEC2  : origin = 0x082000, length = 0x001000
 //  FLASH_BANK0_SEC3  : origin = 0x083000, length = 0x001000
 
 
 
    //BEGIN            : origin = 0x084000, length = 0x000004
   AppFlagW	           : origin = 0x084004, length = 0x000004	//App程序存在标志
   FLASH_APP           : origin = 0x084008, length = 0x01AFF4	/* on-chip Flash */
   FLASHEND            : origin = 0x09EFFC, length = 0x000004   //APP程序结束标志

 
 
 
 //  FLASH_BANK0_SEC4  : origin = 0x084000, length = 0x001000
//   FLASH_BANK0_SEC5  : origin = 0x085000, length = 0x001000
//   FLASH_BANK0_SEC6  : origin = 0x086000, length = 0x001000
//   FLASH_BANK0_SEC7  : origin = 0x087000, length = 0x001000
//   FLASH_BANK0_SEC8  : origin = 0x088000, length = 0x001000
//   FLASH_BANK0_SEC9  : origin = 0x089000, length = 0x001000
//   FLASH_BANK0_SEC10 : origin = 0x08A000, length = 0x001000
//   FLASH_BANK0_SEC11 : origin = 0x08B000, length = 0x001000
//   FLASH_BANK0_SEC12 : origin = 0x08C000, length = 0x001000
//   FLASH_BANK0_SEC13 : origin = 0x08D000, length = 0x001000
 //  FLASH_BANK0_SEC14 : origin = 0x08E000, length = 0x001000
//   FLASH_BANK0_SEC15 : origin = 0x08F000, length = 0x001000





   /* BANK 1 */
 //  FLASH_BANK1_SEC0  : origin = 0x090000, length = 0x001000
  // FLASH_BANK1_SEC1  : origin = 0x091000, length = 0x001000
 //  FLASH_BANK1_SEC2  : origin = 0x092000, length = 0x001000
//   FLASH_BANK1_SEC3  : origin = 0x093000, length = 0x001000
 //  FLASH_BANK1_SEC4  : origin = 0x094000, length = 0x001000
 //  FLASH_BANK1_SEC5  : origin = 0x095000, length = 0x001000
 //  FLASH_BANK1_SEC6  : origin = 0x096000, length = 0x001000
//   FLASH_BANK1_SEC7  : origin = 0x097000, length = 0x001000
//   FLASH_BANK1_SEC8  : origin = 0x098000, length = 0x001000
//   FLASH_BANK1_SEC9  : origin = 0x099000, length = 0x001000
 //  FLASH_BANK1_SEC10 : origin = 0x09A000, length = 0x001000
 //  FLASH_BANK1_SEC11 : origin = 0x09B000, length = 0x001000
 //  FLASH_BANK1_SEC12 : origin = 0x09C000, length = 0x001000
 //  FLASH_BANK1_SEC13 : origin = 0x09D000, length = 0x001000
 //  FLASH_BANK1_SEC14 : origin = 0x09E000, length = 0x001000
 //  FLASH_BANK1_SEC15 : origin = 0x09F000, length = 0x001000

  /* BANK 2 */
   FLASH_BANK2_SEC0  : origin = 0x0A0000, length = 0x001000
   FLASH_BANK2_SEC1  : origin = 0x0A1000, length = 0x001000
   FLASH_BANK2_SEC2  : origin = 0x0A2000, length = 0x001000
   FLASH_BANK2_SEC3  : origin = 0x0A3000, length = 0x001000
   FLASH_BANK2_SEC4  : origin = 0x0A4000, length = 0x001000
   FLASH_BANK2_SEC5  : origin = 0x0A5000, length = 0x001000
   FLASH_BANK2_SEC6  : origin = 0x0A6000, length = 0x001000
   FLASH_BANK2_SEC7  : origin = 0x0A7000, length = 0x001000
   FLASH_BANK2_SEC8  : origin = 0x0A8000, length = 0x001000
   FLASH_BANK2_SEC9  : origin = 0x0A9000, length = 0x001000
   FLASH_BANK2_SEC10 : origin = 0x0AA000, length = 0x001000
   FLASH_BANK2_SEC11 : origin = 0x0AB000, length = 0x001000
   FLASH_BANK2_SEC12 : origin = 0x0AC000, length = 0x001000
   FLASH_BANK2_SEC13 : origin = 0x0AD000, length = 0x001000
   FLASH_BANK2_SEC14 : origin = 0x0AE000, length = 0x001000
   FLASH_BANK2_SEC15 : origin = 0x0AF000, length = 0x000FF0

// FLASH_BANK0_SEC15_RSVD     : origin = 0x0AFFF0, length = 0x000010  /* Reserve and do not use for code as per the errata advisory "Memory: Prefetching Beyond Valid Memory" */

PAGE 1 :
   BOOT_RSVD        : origin = 0x00000002, length = 0x00000126

   App2Boot	  		: origin = 0x00000400, length = 0x00000010
   RAMM1            : origin = 0x00000410, length = 0x000003E8
 // RAMM1_RSVD       : origin = 0x000007F8, length = 0x00000008 /* Reserve and do not use for code as per the errata advisory "Memory: Prefetching Beyond Valid Memory" */

 

 RAMLS_Data           : origin = 0x00009800, length = 0x00001000
// RAMLS3           : origin = 0x00009800, length = 0x00000800  // cla 数据空间
// RAMLS4           : origin = 0x0000A000, length = 0x00000800

   RAMGS_Data		: origin = 0x0000A800, length = 0x00001800
// RAMLS5           : origin = 0x0000A800, length = 0x00000800 //cpu 数据空间
// RAMLS6           : origin = 0x0000B000, length = 0x00000800
// RAMLS7           : origin = 0x0000B800, length = 0x00000800



   CLA1_MSGRAMLOW   : origin = 0x001480, length = 0x000080
   CLA1_MSGRAMHIGH  : origin = 0x001500, length = 0x000080
}


SECTIONS
{
  codestart         : > BEGIN,          PAGE = 0, ALIGN(4)
   .text            : > FLASH_BOOT,     PAGE = 0, ALIGN(4)
   .cinit           : > FLASH_BOOT,     PAGE = 0, ALIGN(4)

   .stack           : > RAMM1,         	PAGE = 1
   .switch          : > FLASH_BOOT,     PAGE = 0, ALIGN(4)



//   .pinit           : > FLASH_BOOT,     PAGE = 0, ALIGN(4)
//   .ebss            : > RAMGS_Data,    	PAGE = 1
//   .esysmem         : > RAMGS_Data,    	PAGE = 1
//   .cio             : > RAMGS_Prog,    	PAGE = 0, ALIGN(4)
//   .econst          : > FLASH_BOOT,    	PAGE = 0, ALIGN(4)




#if defined(__TI_EABI__)
   .init_array      : > FLASH_BOOT,     	PAGE = 0, ALIGN(4)
   .bss             : > RAMGS_Data,        PAGE = 1
   .bss:output      : > RAMGS_Data,        PAGE = 1
   .bss:cio         : > RAMGS_Data,        PAGE = 1
   .data            : > RAMGS_Data,        PAGE = 1
   .sysmem          : > RAMGS_Data,        PAGE = 1
   .const           : > FLASH_BOOT,         PAGE = 0, ALIGN(4)
#else
   .pinit           : > FLASH_BOOT,         PAGE = 0, ALIGN(4)
   .ebss            : > RAMGS_Data,        PAGE = 1
   .esysmem         : > RAMGS_Data,        PAGE = 1
   .cio             : > RAMGS_Prog,        PAGE = 0, ALIGN(4)
   .econst          : > FLASH_BOOT,         PAGE = 0, ALIGN(4)
#endif

   AppFlag	        : > AppFlagW,   	PAGE = 0, ALIGN(4)			/* XW */
   App2BootData     : > App2Boot,	 	PAGE = 1

  .reset           : > RESET,          PAGE = 0, TYPE = DSECT /* not used, */



   GROUP
   {
       .TI.ramfunc
       { -l FAPI_F28003x_EABI_v1.58.01.lib}

   } LOAD = FLASH_BOOT,
     RUN = RAMGS_Prog,
    // LOAD_START(_RamfuncsLoadStart),
   //  LOAD_SIZE(_RamfuncsLoadSize),
   //  LOAD_END(_RamfuncsLoadEnd),
    // RUN_START(_RamfuncsRunStart),
    // RUN_SIZE(_RamfuncsRunSize),
   //  RUN_END(_RamfuncsRunEnd),

     LOAD_START(RamfuncsLoadStart),
     LOAD_SIZE(RamfuncsLoadSize),
     LOAD_END(RamfuncsLoadEnd),
     RUN_START(RamfuncsRunStart),
     RUN_SIZE(RamfuncsRunSize),
     RUN_END(RamfuncsRunEnd),
     PAGE = 0, ALIGN(4)

}

/*
//===========================================================================
// End of file.
//===========================================================================
*/

Do you have any suggestion here? Thanks.

over 2 years ago

0 Shaoxing Ke over 2 years ago

TI__Expert 3590 points

Hi Experts,

The issue is urgent, please help look into it.

0 Ronak Harsora over 2 years ago

TI__Prodigy 650 points

Hi Shaoxing Ke

Can you please let me know if I have understood your question correctly.

You are trying to use a same variable stored in RAM location when switching from Application to BOOT. While doing so you find out that the RAM location keeps getting cleared once you switch from application to BOOT.

You want to know a method to preserve the value stored in the variable between the application and boot?

0 Shaoxing Ke over 2 years ago in reply to Ronak Harsora

TI__Expert 3590 points

Yes we want to keep the value stored in the variable between the application and boot in the RAM.

0 Ronak Harsora over 2 years ago in reply to Shaoxing Ke

TI__Prodigy 650 points

Hi Shaoxing Ke

Can you try using M1 RAM for storing the varialble. M0 RAM is cleared when switching between the application and Boot mode.

0 Shaoxing Ke over 2 years ago in reply to Ronak Harsora

TI__Expert 3590 points

Hi Ronak,

M1 RAM same as M0 RAM. BTW, customer previously use CCS 9.1, the variable strApp2BootData would not be cleared. we do not why cause this?

0 Omer Amir over 2 years ago in reply to Shaoxing Ke

TI__Mastermind 30185 points

Hello Shaoxing,

Our expert had an emergency so they were out of the office. They will respond once they get the chance.

Best regards,

Omer Amir

0 Ki over 2 years ago in reply to Shaoxing Ke

TI__Guru**** 474421 points

Shaoxing Ke said:
BTW, customer previously use CCS 9.1, the variable strApp2BootData would not be cleared. we do not why cause this

What is the compiler version used in the CCS 9.1 environment and what CCS version and compiler version is currently used?

If the customer uses the executable generated from CCS 9.1 with the current CCS version, does the issue still occur?

Thanks

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280039C: RAM specifies the variable strApp2BootData, switch from APP to Boot, and the variable strApp2BootData will be cleared before entering the Main function.