C6713- Configuring SDRAM

A resource to use is the Board Support Library available from Spectrum Digital's support site for the DSK to get information on configuring the SDRAM interface.

DSP/BIOS itself would not configure the processor external memory interface, but some setup code would be needed.  Again, there should be resources in the BSL to help do this.

http://c6000.spectrumdigital.com/dsk6713/

Hi Brandon,

Thanks for your reply.

I used DSP/BIOS Memory Management to add SDRAM. You can follow the steps in the snapshot given below.

http://i53.tinypic.com/jhahee.jpg

Every thing is same as I followed while setting SDRAM except the Data Section (.data) under Compiler Sections TAB, mistakenly it is showing SDRAM but actually it is IRAM.

When I build the project, I am getting the following warning.

warning: creating output section SDRAM without SECTIONS specification

This is how I defined my buffer to save large amount of data.

#define ST_SZ 102400;

float data_stats[ST_SZ];

#pragma DATA_SECTION(data_stats,"SDRAM")

Program runs pretty fine though with the above warning but it doesn't exit after writing all the data points from DATA_STATS buffer to .TEXT file. When I halt the program forcely I see the pointer at momory section: RTDX_Final_RT_Monitor. You can see this in the last picture of the snapshot.

for(j=0; j<ST_SZ; j++)

           {
                      fprintf(fp, "%f\n", data_stats[j] );
            }

fclose(fp);
exit(1);

But when the size of DATA_STATS is smaller to be fit in IRAM it exits fine.

Whats wrong here ? Am I defining the SDRAM in the right way or should there be any changing in the setting which I showed you before ?

I appreciate your help.

When the DSP/BIOS configuration tool generates the appropriate files which need to be included in your project, does the resultant linker command file have a SECTION declared SDRAM?

You can see my cmd file here. Only MEMORY section define SDRAM otherwise I don't see any SECTION saying any thing about SDRAM. I think thats the problem I am still getting warning.

/* INPUT ADS7881.cdb */

/* MODULE PARAMETERS */
GBL_USERINITFXN = _FXN_F_nop;

MEM_SEGZERO = IRAM;
MEM_MALLOCSEG = IRAM;

CLK_TIMEFXN = CLK_F_getshtime;
CLK_HOOKFXN = HWI_F_dispatch;

PRD_THOOKFXN = _KNL_tick;

RTDX_DATAMEMSEG = IRAM;

HST_DSMBUFSEG = IRAM;

SWI_EHOOKFXN = GBL_NULL;
SWI_IHOOKFXN = GBL_NULL;
SWI_EXECFXN = SWI_F_iexec;
SWI_RUNFXN = SWI_F_run;

TSK_STACKSEG = MEM_NULL;
TSK_VCREATEFXN = _FXN_F_nop;
TSK_VDELETEFXN = _FXN_F_nop;
TSK_VEXITFXN = _FXN_F_nop;

IDL_CALIBRFXN = IDL_F_stub;

SYS_ABORTFXN = _UTL_doAbort;
SYS_ERRORFXN = _UTL_doError;
SYS_EXITFXN = _UTL_halt;
SYS_PUTCFXN = _UTL_doPutc;

GIO_CREATEFXN = _FXN_F_nop;
GIO_DELETEFXN = _FXN_F_nop;
GIO_PENDFXN = _FXN_F_nop;
GIO_POSTFXN = _FXN_F_nop;

/* OBJECT ALIASES */
_IRAM = IRAM;
_SDRAM = SDRAM;
_PRD_clock = PRD_clock;
_RTA_fromHost = RTA_fromHost;
_RTA_toHost = RTA_toHost;
_HWI_RESET = HWI_RESET;
_HWI_NMI = HWI_NMI;
_HWI_RESERVED0 = HWI_RESERVED0;
_HWI_RESERVED1 = HWI_RESERVED1;
_HWI_INT4 = HWI_INT4;
_HWI_INT5 = HWI_INT5;
_HWI_INT6 = HWI_INT6;
_HWI_INT7 = HWI_INT7;
_HWI_INT8 = HWI_INT8;
_HWI_INT9 = HWI_INT9;
_HWI_INT10 = HWI_INT10;
_HWI_INT11 = HWI_INT11;
_HWI_INT12 = HWI_INT12;
_HWI_INT13 = HWI_INT13;
_HWI_INT14 = HWI_INT14;
_HWI_INT15 = HWI_INT15;
_KNL_swi = KNL_swi;
_TSK_idle = TSK_idle;
_LNK_dataPump = LNK_dataPump;
_RTA_dispatcher = RTA_dispatcher;
_IDL_cpuLoad = IDL_cpuLoad;
_LOG_system = LOG_system;
_IDL_busyObj = IDL_busyObj;

/* MODULE GBL */

SECTIONS {
   .vers (COPY): {} /* version information */
}

-priority
-llnkrtdx.a62
-ldrivers.a67          /* device drivers support */
-lsioboth.a62          /* supports both SIO models */
-lbiosi.a62            /* DSP/BIOS support */
-lrtdx.lib             /* RTDX support */
-lcsl6713.lib
-lrts6700.lib          /* C and C++ run-time library support */

_GBL_CACHE = GBL_CACHE;

/* MODULE MEM */
-stack 0x400
MEMORY {
   IRAM        : origin = 0x0,         len = 0x40000
   SDRAM       : origin = 0x80000000,  len = 0x1000000
}
/* MODULE CLK */
SECTIONS {
   .clk: {
        _CLK_start = _CLK_start6x;
        CLK_F_gethtime = CLK_F_getshtime;
        CLK_A_TABBEG = .;
        *(.clk)
        CLK_A_TABEND = .;
        CLK_A_TABLEN = (. - CLK_A_TABBEG) / 1;
   } > IRAM
}
_CLK_PRD = CLK_PRD;
_CLK_COUNTSPMS = CLK_COUNTSPMS;
_CLK_REGS = CLK_REGS;
_CLK_USETIMER = CLK_USETIMER;
_CLK_TIMERNUM = CLK_TIMERNUM;
_CLK_TDDR = CLK_TDDR;

/* MODULE PRD */
SECTIONS {
   .prd: {
        PRD_A_TABBEG = .;
        /* no PRD objects */
        PRD_A_TABEND = .;
        PRD_A_TABLEN = (. - PRD_A_TABBEG) / 32;
   } > IRAM
}

/* MODULE RTDX */
_RTDX_interrupt_mask = 0x0;

/* MODULE HWI */
SECTIONS {
    .hwi_vec: 0x0 {
        HWI_A_VECS = .;
        *(.hwi_vec)
    }
}

/* MODULE SWI */
SECTIONS {
   .swi: {
        SWI_A_TABBEG = .;
        *(.swi)
        SWI_A_TABEND = .;
        SWI_A_TABLEN = (. - SWI_A_TABBEG) / 44;
   } > IRAM
}

/* MODULE IDL */
SECTIONS {
   .idl: {
        IDL_A_TABBEG = .;
        *(.idl)
        IDL_A_TABEND = .;
        IDL_A_TABLEN = (. - IDL_A_TABBEG) / 8;
        IDL_A_CALBEG = .;
        *(.idlcal)
        IDL_A_CALEND = .;
        IDL_A_CALLEN = (. - IDL_A_CALBEG) / 8;
   } > IRAM
}



SECTIONS {
        .bss:     {} > IRAM
       
        .far:     {} > IRAM
       
        .sysdata: {} > IRAM
       
        .mem:       {} > IRAM
       
        .sysinit:    {} > IRAM
       
        .sysregs: {} > IRAM
       
        .gblinit:    {} > IRAM
       
        .trcdata:    {} > IRAM
       
        .args: fill=0 {
            *(.args)
            . += 0x4;
        } > IRAM
       
        .cinit:    {} > IRAM
       
        .pinit:   {} > IRAM
       
        .data:    {} > IRAM
       
        .const:    {} > IRAM
       
        .switch:    {} > IRAM
       
        .cio:     {} > IRAM
       
        .text:    {} > IRAM
       
        frt:    {} > IRAM
       
        .bios:    {} > IRAM
       
        .stack: fill=0xc0ffee {
            GBL_stackbeg = .;
            *(.stack)
            GBL_stackend = GBL_stackbeg + 0x400 - 1;
            _HWI_STKBOTTOM = GBL_stackbeg + 0x400 - 4 & ~7;
            _HWI_STKTOP = GBL_stackbeg;
        } > IRAM
       
        .trace: fill = 0x0 {
           _SYS_PUTCBEG = .;
           . += 0x200;
           _SYS_PUTCEND = . - 1;
        } > IRAM
       
        .rtdx_data: {}  > IRAM
       
        .rtdx_text: {}  > IRAM
       
        .hst: {
             HST_A_TABBEG = .;
            _HST_A_TABBEG = .;
            *(.hst)
            HST_A_TABEND = .;
            _HST_A_TABEND = .;
             HST_A_TABLEN = (. - _HST_A_TABBEG) / 20;
            _HST_A_TABLEN = (. - _HST_A_TABBEG) / 20;
        } > IRAM
       
        .dsm: {} > IRAM
       
       /* RTA_fromHost buffer */
       .hst1: align = 0x4 {} > IRAM
       
       /* RTA_toHost buffer */
       .hst0: align = 0x4 {} > IRAM
       
        .hwi: {}  > IRAM
       
        .tsk: {
            *(.tsk)
        } > IRAM
       
        .TSK_idle$stk: {
            *(.TSK_idle$stk)
        } > IRAM
       
        .log: {
             LOG_A_TABBEG = .;
            _LOG_A_TABBEG = .;
            *(.log)
            LOG_A_TABEND = .;
            _LOG_A_TABEND = .;
             LOG_A_TABLEN = (. - _LOG_A_TABBEG) / 24;
            _LOG_A_TABLEN = (. - _LOG_A_TABBEG) / 24;
        } > IRAM
       
        .printf (COPY): {} > IRAM
       
        /* LOG_system buffer */
        .LOG_system$buf: align = 0x100 fill = 0xffffffff {} > IRAM
       
        .pip: {
             PIP_A_TABBEG = .;
            _PIP_A_TABBEG = .;
            *(.pip)
            PIP_A_TABEND = .;
            _PIP_A_TABEND = .;
             PIP_A_TABLEN = (. - _PIP_A_TABBEG) / 100;
            _PIP_A_TABLEN = (. - _PIP_A_TABBEG) / 100;
        } > IRAM
       
        .sts: {
             STS_A_TABBEG = .;
            _STS_A_TABBEG = .;
            *(.sts)
            STS_A_TABEND = .;
            _STS_A_TABEND = .;
             STS_A_TABLEN = (. - _STS_A_TABBEG) / 16;
            _STS_A_TABLEN = (. - _STS_A_TABBEG) / 16;
        } > IRAM
       
        .sys:     {} > IRAM
       
        .gio:     {} > IRAM
       
        .IRAM$heap: {
            IRAM$B = .;
            _IRAM_base = .;
            IRAM$L = 0x8000;
            _IRAM_length = 0x8000;
            . += 0x8000;
        } > IRAM
       
}

How to solve this problem ?

I wonder if you have a namespace collision going on here.  Not sure, but something to check.  What I mean by that is you have defined a MEMORY in DSP/BIOS called SDRAM which is found in the highlighted MEMORY section of the linker command file.

But you have also defined section called SDRAM as well in the C code and DSP/BIOS.

As a quick test, would you change one of those to be unique.  It might be easiest to change the MEMORY one since I think you only need to modify one location in the DSP/BIOS configuration.

Again, I don't know if this is the cause, but you should rule it out.

Also, what version of DSP/BIOS and Code Composer Studio are you using?

Hi,

The only problem I am having is that .cmd file doesn't define SECTION for SDRAM, I tried with SDRAM2 or some other name but still the same warning.

#pragma DATA_SECTION(data_stats,".SDRAM2") ---- > I am using this line just to define data_stats buffer into SDRAM2 memory address range.

I am using CCS Version: 3.1.0 and BIOS Version: cuda-4.90.02.10 and Code Generation Tools Version: 5.1.0

However, I added SDRAM as SRAM_EXT into Memory Section Manager and added another .cmd file as ERAM.cmd and defined SECTION EXTRAM for SRAM_EXT as given below:

SECTIONS
{
  .EXTRAM  :> SRAM_EXT
}

DSP/BIOS doesn't allow to modify .cmd file thats why I added another .cmd file to define SECTION and I think its working, I am not getting any warnings. Is it ok to do this way ?

One problem is that my program doesn't exit after writing data to .text file. When the buffer size is smaller it is working fine but as I increase the size of buffer, program doesn't exit. What I halt the program, it shows cursor at RTDX_Final_RT_Monitor.

What wrong here ?

Yes, it is okay to add the additional linker command file into the project to define the SECTIONS and MEMORY definitions.

I would suggest opening a different thread on the other issue.

Thanks Brandon.