Flash to one particular location

Forgot to mention that i use F28335, Spectrum Digital 510 usb emulator, CCS v3.3 CGT 5.13

Krishna Devale said:

I changed the linker command file to reserve a location out of flash B sector with name: LocationXInFlashB

MEMORY
{

  PAGE 1:    FLASHB_1: origin = 0x337000, length = 0x001000
  ...
  ...
}

SECTIONS
{
   LocationXInFlashB : > FLASHB_1,  PAGE=1
}

Hi,

yes I do have sections specification in linker command file. Below is the linker command file:

Command File:

/*
// TI File $Revision: /main/10 $
// Checkin $Date: July 9, 2008   13:43:56 $
//###########################################################################
//
// FILE: F28335.cmd
//
// TITLE: Linker Command File For F28335 Device
//
//###########################################################################
// $TI Release: DSP2833x/DSP2823x C/C++ Header Files V1.31 $
// $Release Date: August 4, 2009 $
//###########################################################################
*/

/* ======================================================
// For Code Composer Studio V2.2 and later
// ---------------------------------------
// In addition to this memory linker command file,
// add the header linker command file directly to the project.
// The header linker command file is required to link the
// peripheral structures to the proper locations within
// the memory map.
//
// The header linker files are found in <base>\DSP2833x_Headers\cmd
//  
// For BIOS applications add:      DSP2833x_Headers_BIOS.cmd
// For nonBIOS applications add:   DSP2833x_Headers_nonBIOS.cmd   
========================================================= */

/* ======================================================
// For Code Composer Studio prior to V2.2
// --------------------------------------
// 1) Use one of the following -l statements to include the
// header linker command file in the project. The header linker
// file is required to link the peripheral structures to the proper
// locations within the memory map                                    */

/* Uncomment this line to include file only for non-BIOS applications */
/* -l DSP2833x_Headers_nonBIOS.cmd */

/* Uncomment this line to include file only for BIOS applications */
/* -l DSP2833x_Headers_BIOS.cmd */

/* 2) In your project add the path to <base>\DSP2833x_headers\cmd to the
   library search path under project->build options, linker tab,
   library search path (-i).
/*========================================================= */

/* Define the memory block start/length for the F28335 
   PAGE 0 will be used to organize program sections
   PAGE 1 will be used to organize data sections

    Notes:
          Memory blocks on F28335 are uniform (ie same
          physical memory) in both PAGE 0 and PAGE 1. 
          That is the same memory region should not be
          defined for both PAGE 0 and PAGE 1.
          Doing so will result in corruption of program
          and/or data.
         
          L0/L1/L2 and L3 memory blocks are mirrored - that is
          they can be accessed in high memory or low memory.
          For simplicity only one instance is used in this
          linker file.
         
          Contiguous SARAM memory blocks can be combined
          if required to create a larger memory block.
 */

MEMORY
{
PAGE 0:    /* Program Memory */
           /* Memory (RAM/FLASH/OTP) blocks can be moved to PAGE1 for data allocation */

   ZONE0       : origin = 0x004000, length = 0x001000     /* XINTF zone 0 */
   RAML0       : origin = 0x008000, length = 0x001000     /* on-chip RAM block L0 */
   RAML1       : origin = 0x009000, length = 0x001000     /* on-chip RAM block L1 */
   RAML2       : origin = 0x00A000, length = 0x001000     /* on-chip RAM block L2 */
   RAML3       : origin = 0x00B000, length = 0x001000     /* on-chip RAM block L3 */
   ZONE6       : origin = 0x0100000, length = 0x100000    /* XINTF zone 6 */
   ZONE7A      : origin = 0x0200000, length = 0x00FC00    /* XINTF zone 7 - program space */
   FLASHH      : origin = 0x300000, length = 0x008000     /* on-chip FLASH */
   FLASHG      : origin = 0x308000, length = 0x008000     /* on-chip FLASH */
   FLASHF      : origin = 0x310000, length = 0x008000     /* on-chip FLASH */
   FLASHE      : origin = 0x318000, length = 0x008000     /* on-chip FLASH */
   FLASHD      : origin = 0x320000, length = 0x008000     /* on-chip FLASH */
   FLASHC      : origin = 0x328000, length = 0x008000     /* on-chip FLASH */
   FLASHA      : origin = 0x338000, length = 0x007F80     /* on-chip FLASH */
   CSM_RSVD    : origin = 0x33FF80, length = 0x000076     /* Part of FLASHA.  Program with all 0x0000 when CSM is in use. */
   BEGIN       : origin = 0x33FFF6, length = 0x000002     /* Part of FLASHA.  Used for "boot to Flash" bootloader mode. */
   CSM_PWL     : origin = 0x33FFF8, length = 0x000008     /* Part of FLASHA.  CSM password locations in FLASHA */
   OTP         : origin = 0x380400, length = 0x000400     /* on-chip OTP */
   ADC_CAL     : origin = 0x380080, length = 0x000009     /* ADC_cal function in Reserved memory */
  
   IQTABLES    : origin = 0x3FE000, length = 0x000b50     /* IQ Math Tables in Boot ROM */
   IQTABLES2   : origin = 0x3FEB50, length = 0x00008c     /* IQ Math Tables in Boot ROM */ 
   FPUTABLES   : origin = 0x3FEBDC, length = 0x0006A0     /* FPU Tables in Boot ROM */
   ROM         : origin = 0x3FF27C, length = 0x000D44     /* Boot ROM */       
   RESET       : origin = 0x3FFFC0, length = 0x000002     /* part of boot ROM  */
   VECTORS     : origin = 0x3FFFC2, length = 0x00003E     /* part of boot ROM  */

PAGE 1 :   /* Data Memory */
           /* Memory (RAM/FLASH/OTP) blocks can be moved to PAGE0 for program allocation */
           /* Registers remain on PAGE1                                                  */
  
   BOOT_RSVD   : origin = 0x000000, length = 0x000050     /* Part of M0, BOOT rom will use this for stack */
   RAMM0       : origin = 0x000050, length = 0x0003B0     /* on-chip RAM block M0 */
   RAMM1       : origin = 0x000400, length = 0x000400     /* on-chip RAM block M1 */
   RAML4       : origin = 0x00C000, length = 0x001000     /* on-chip RAM block L1 */
   RAML5       : origin = 0x00D000, length = 0x001000     /* on-chip RAM block L1 */
   RAML6       : origin = 0x00E000, length = 0x001000     /* on-chip RAM block L1 */
   RAML7       : origin = 0x00F000, length = 0x001000     /* on-chip RAM block L1 */
   ZONE7B      : origin = 0x20FC00, length = 0x000400     /* XINTF zone 7 - data space */
   FLASHB_ORG  : origin = 0x330000, length = 0x0000E6     /* on-chip FLASH */
   FLASHB_ONEFLAG  : origin = 0x3300E6, length = 0x000001     /* on-chip FLASH */
   FLASHB_CONT  : origin = 0x3300E7, length = 0x007F19     /* on-chip FLASH */
}

/* Allocate sections to memory blocks.
   Note:
         codestart user defined section in DSP28_CodeStartBranch.asm used to redirect code
                   execution when booting to flash
         ramfuncs  user defined section to store functions that will be copied from Flash into RAM
*/
 
SECTIONS
{
 
   /* Allocate program areas:
   .cinit              : > FLASHA      PAGE = 0
   .pinit              : > FLASHA,     PAGE = 0
   .text               : > FLASHA      PAGE = 0
   codestart           : > BEGIN       PAGE = 0
   ramfuncs            : LOAD = FLASHD,
                         RUN = RAML0,
                         LOAD_START(_RamfuncsLoadStart),
                         LOAD_END(_RamfuncsLoadEnd),
                         RUN_START(_RamfuncsRunStart),
                         PAGE = 0

   csmpasswds          : > CSM_PWL     PAGE = 0
   csm_rsvd            : > CSM_RSVD    PAGE = 0
  
   // Allocate uninitalized data sections:
   .stack              : > RAMM1       PAGE = 1
   .ebss               : > RAML4       PAGE = 1
   .esysmem            : > RAMM1       PAGE = 1

   //Initalized sections go in Flash
   // For SDFlash to program these, they must be allocated to page 0
   .econst             : > FLASHA      PAGE = 0
   .switch             : > FLASHA      PAGE = 0     

   // Allocate IQ math areas:
   IQmath              : > FLASHC      PAGE = 0                 
   IQmathTables     : > IQTABLES,  PAGE = 0, TYPE = NOLOAD
  

  
   FPUmathTables    : > FPUTABLES, PAGE = 0, TYPE = NOLOAD */
   LocationXInFlashB    : > FLASHB_ONEFLAG, PAGE = 1, TYPE = NOLOAD

}

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

Below is the code i have:

#pragma DATA_SECTION(OneFlag,"LocationXInFlashB");
const unsigned int OneFlag = 0x05;

Project file:

; Code Composer Project File, Version 2.0 (do not modify or remove this line)

[Project Settings]
ProjectDir="E:\SGS\Users\DevaleKrishna\SplFlashOneFlag\"
ProjectType=Executable
CPUFamily=TMS320C28XX
Tool="Compiler"
Tool="CustomBuilder"
Tool="DspBiosBuilder"
Tool="Linker"
Config="Debug"
Config="Release"

[Source Files]
Source="flash.c"
Source="F28335.cmd"

["Compiler" Settings: "Debug"]
Options=-g -pdsw225 -fr"$(Proj_dir)\Debug" -d"_DEBUG" -v28

["Compiler" Settings: "Release"]
Options=-pdsw225 -o3 -fr"$(Proj_dir)\Release" -d"LARGE_MODEL" -ml -v28

["Linker" Settings: "Debug"]
Options=-a -m".\Debug\OneFlagFlash.map" -o".\Debug\OneFlagFlash.out" -w

["Linker" Settings: "Release"]
Options=-c -m".\Release\OneFlagFlash.map" -o".\Release\OneFlagFlash.out" -w -x

["F28335.cmd" Settings: "Debug"]
LinkOrder=1

["F28335.cmd" Settings: "Release"]
LinkOrder=1

You have the section specified as a NOLOAD section which means it will not be placed in the output file and will not be loaded onto the target. 

   LocationXInFlashB    : > FLASHB_ONEFLAG, PAGE = 1, TYPE = NOLOAD

Remove the TYPE=NOLOAD and give it a try.

The section qualifier NOLOAD, and other qualifiers like it, is described in this wiki article.

Thanks and regards,

-George

Thanks Aarti and George. After removing qualifier NO_LOAD I'm able to flash. :)

I need just one more help. I've shared the code, linker command file and project file in earlier post. From that will you be able to tell me whether after flashing the out file generated it will update only the location i'm iterested in i.e 0x3300e6 or any chances of writing into other flash locations. The reason is i dont want to screw up other loactions which already has some content.

regards,

Krishna

The Flash programmer checks that the flash sector is erased before it programs. If the location that this data is getting programmed to has been erased when the code was previously programmed then it will be able to program it. However if you want to change the same location at a later time, you would need to erase and then program. Also, since you want to avoid erasing other parts of the code, make sure that this data is in a separate flash sector where nothing else is allocated, as the minimum range you can choose to erase is a flash sector.