Defining Memory in External Memory

Bill,

Please take a look at this related post (specifically point 3) and hope it answers your questions. Let us know if you have any remaining questions.
http://e2e.ti.com/support/development_tools/code_composer_studio/f/81/p/259849/911213.aspx#911213

I will look at that and let you know how I make out.

Thanks!

 I modified my .cmd file as follows with no luck:

  MEMORY
  {
  PAGE 0:     /* Flash */
      /* FPGA Flash (128KB) */
      TTPMEDL : origin = 0x180000, length = 0x000800  /* TTP MEDL Table */
      TTPTASM : origin = 0x180800, length = 0x001000  /* TTP TASM */
      TTPHWCC : origin = 0x181800, length = 0x003000  /* TTP HW-COM Configuration */
      /* Internal Flash (512KB) */
      IMGH     : origin = 0x300000, length = 0x000010  /* Processor Flash for Prime Image Header. */
      INTFLASH : origin = 0x300010, length = 0x070000  /* Processor Flash for Prime Image. */
      CSMD     : origin = 0x370010, length = 0x000076  /* CSM Data, zero when using CSM. */
      BTFEP    : origin = 0x370086, length = 0x000002  /* Boot-to-Flash Entry Point. */
      CSMPW    : origin = 0x370088, length = 0x000008  /* CSM Password, do not zero. */
      BROM     : origin = 0x7FE000, length = 0x001FC0  /* Boot ROM. */
      BVEC     : origin = 0x7FFFC0, length = 0x000040  /* Boot Interrupt Vector. */
      EXTFLASH : origin = 0x800000, length = 0x500000 
 
  PAGE 1:     /* RAM */  
      INTDATA1 : origin = 0x000000, length = 0x000800 /* Processor SARAM [M0-M1] */
      STACK    : origin = 0x008000, length = 0x001000 /* Processor SARAM [L0] */
      INTDATA2 : origin = 0x009000, length = 0x003000 /* Processor SARAM [L1-L3] */
      INTDATA3 : origin = 0x00C000, length = 0x004000 /* Processor SARAM [L4-L7] (DMA Accessible) */
      INTDATA4 : origin = 0x001000, length = 0x007000
      EXTDATA  : origin = 0xD00000, length = 0x600000
  }
 
  SECTIONS
  {
      /* Image Header: */
        .ImageHeader    : > IMGH, PAGE = 0
      /* Data Initialization Table: */
        .cinit          : > EXTFLASH, PAGE = 0
      /* Constants: */
        .const          : > INTFLASH, PAGE = 0
        .econst         : > INTFLASH, PAGE = 0
      /* INTFLASH-Resident Executable Code: */
        .text           : > INTFLASH, PAGE = 0
      /* Switch Statement Tables: */
        .switch         : > INTFLASH, PAGE = 0
      /* Unused Reset Pointer: */
        .reset          : > INTFLASH, PAGE = 0, TYPE = DSECT
      /* Stack: */
        .stack          : > STACK, PAGE = 1,
                            START(_SP_INIT),
                            SIZE(_STACK_SIZE),
                            END(_SP_END)
      /* Data by default resides in either Internal or External RAM: */
        .ebss           : >> INTDATA1 | INTDATA2 | INTDATA3 | EXTDATA, PAGE = 1
      /* DMA Accessible Data: */
        .dmadata        : > INTDATA3,  PAGE = 1
  }

I also use a .gel file to try to initialize memory and activate external memory.

I modified the f28335.gel as follows:

  OnReset(int nErrorCode)
  {
    C28x_Mode();
    Unlock_CSM();
    ADC_Cal();
    XINTF_Enable();
    F28335_Memory_Map();
  }

  OnTargetConnect()
  {
    C28x_Mode();
    F28335_Memory_Map();            /* Initialize the CCS memory map */
   
    /* Check to see if CCS has been started-up with the DSP already */
    /* running in real-time mode.  The user can add whatever        */
    /* custom initialization stuff they want to each case.          */
    if (GEL_IsInRealtimeMode())     /* Do real-time mode target initialization */
    {
    }
    else                            /* Do stop-mode target initialization */
    {
      GEL_Reset();                /* Reset DSP */
    }
  }
 
  hotmenu F28335_Memory_Map()
  {
    GEL_MapReset();
    GEL_MapOn();
    GEL_MapDelete(0x00000000, 0);
    GEL_MapDelete(0x00000000, 1);
   
    /* Program memory map */
    GEL_MapAdd(0x000000,0,0x000800,1,1);             /* INTDATA1 : Processor SARAM [M0-M1]                  */
    GEL_MapAdd(0x800,0,0x800,1,1);
    GEL_MapAdd(0x001000,0,0x007000,1,1);
    GEL_MapAdd(0x008000,0,0x001000,1,1);             /* STACK    : Processor SARAM [L0]                     */
    GEL_MapAdd(0x009000,0,0x003000,1,1);             /* INTDATA2 : Processor SARAM [L1-L3]                  */
    GEL_MapAdd(0x00C000,0,0x004000,1,1);             /* INTDATA3 : Processor SARAM [L4-L7] (DMA Accessible) */
    GEL_MapAdd(0x10000,0,0x20000,1,1);
  //    GEL_MapAdd(0x800000,0,0x400000,1,1);             /* EXTFLASH  : Processor External SRAM (CS7)            */
  //    GEL_MapAddStr(0x800000,0,0x400000,"EX",0);
    GEL_MapAdd(0x300000,0,0x000010,1,1);             /* IMGH     : Processor Flash for Prime Image Header.  */
    GEL_MapAdd(0x300010,0,0x070000,1,1);             /* INTFLASH : Processor Flash for Prime Image.         */
    GEL_MapAddStr(0x300010,0,0x070000,"RAM",0);
    GEL_MapAdd(0x370010,0,0x000076,1,1);             /* CSMD     : CSM Data, zero when using CSM.           */
    GEL_MapAdd(0x370086,0,0x000002,1,1);             /* BTFEP    : Boot-to-Flash Entry Point.               */
    GEL_MapAdd(0x370088,0,0x000008,1,1);             /* CSMPW    : CSM Password, do not zero.               */
   
    /* Data memory map */
    GEL_MapAdd(0x000000,1,0x000800,1,1);             /* INTDATA1 : Processor SARAM [M0-M1]                  */
    GEL_MapAdd(0x008000,1,0x001000,1,1);             /* STACK    : Processor SARAM [L0]                     */
    GEL_MapAdd(0x009000,1,0x003000,1,1);             /* INTDATA2 : Processor SARAM [L1-L3]                  */
    GEL_MapAdd(0x00C000,1,0x004000,1,1);             /* INTDATA3 : Processor SARAM [L4-L7] (DMA Accessible) */
    GEL_MapAdd(0x300000,1,0x000010,1,1);             /* IMGH     : Processor Flash for Prime Image Header.  */
    GEL_MapAdd(0x300010,1,0x070000,1,1);             /* INTFLASH : Processor Flash for Prime Image.         */
    GEL_MapAdd(0x370010,1,0x000076,1,1);             /* CSMD     : CSM Data, zero when using CSM.           */
    GEL_MapAdd(0x370086,1,0x000002,1,1);             /* BTFEP    : Boot-to-Flash Entry Point.               */
    GEL_MapAdd(0x370088,1,0x000008,1,1);             /* CSMPW    : CSM Password, do not zero.               */
    GEL_MapAdd(0x800,1,0x800,1,1);
    GEL_MapAdd(0x001000,1,0x007000,1,1);
   
    GEL_MapAdd(0xD00000,1,0x600000,1,1);             /* EXTDATA  : Processor External SRAM (CS7)            */
    GEL_MapAddStr(0xD00000,1,0x600000,"EX",0);
  }

This allows me to compile, link, and start execution in the simulator/debugger. However, I notice that the my data is not initialized. And when I try to open a file for output the program crashes since memory has not been properly initialized.

As can be seen very large chunks of memory are needed. And this seems to be the problem. I am trying to place the .cinit on page 0 into an area that is out of range for program memory.

Are you using the F283x simulator in CCS or actual hardware to load and debug your code? If you are using the simulator this will not work. If you are using a target board, is it a TI development board or your own custom board?

I am using the F283x simulator in CSS.

So, there is no way around this?

Thanks for your help!

Bill