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F28335 Is there a limit to the size of ramfuncs

Edward Sanders
Intellectual 430 points

Greetings,

 

                I am using an F28335 and have moved my code to flash.  For performance reasons, I started moving some of the code back to RAM using ramfuncs.  This worked well at first.  But as I added more routines to ramfuncs, the debugger stopped working.  It seems to erase the flash and program it, but it never goes to the main function, and as a result never allows me to run it.  I tried backing out the most recent changes, but I still can’t run it.  To recover, I needed to go back to an archived version of the code.  So far, I have tried to put less than 2K into ramfuncs.

 

                Other than the size of memory, is there a limit on how much code can be in ramfuncs?  Is there a way to continuing moving code into ramfuncs?

 

Thank you,

 

Ed

  • 0
    TI__Guru** 113725 points

    Hi Edward,

    We are not aware of any such limit. There could be some other error in code which caused this issue. Also look for any warning during compile time.

    Regards,

    Vivek Singh 

  • 0
    TI__Mastermind 19810 points

    Edward Sanders said:
    But as I added more routines to ramfuncs, the debugger stopped working.  It seems to erase the flash and program it, but it never goes to the main function, and as a result never allows me to run it

    Ed,

    inspect your linker command file, seems like some of the sections are over running. If it doesn't get to main (and I'm guessting that your memcpy for RAMFUNCs is inside main()) then most probably the CINIT initialization isn't completing which means some of the sections are not loaded properly. You can also find out by inspecting your map file.

    Hope this helps.

    Best Regards

    Santosh Athuru

  • 0 in reply to Santosh Athuru
    Intellectual 430 points

    All,

     

                    The build shows no warnings.  In the map file, I’ve looked at the results in the memory area associated with the ramfuncs.  The only other thing in it is the stack.  Currently ramfuncs is sized at 0x6e1, and the stack is sized at 0x300.  The two are in RAML0.  Everything in flash is in FLASHA in which I have consumed 0x23ea of 0x8000 words.

     

                    If the linker sections are overrunning, shouldn’t I get a link error?  I’m currently receiving no errors and no warnings.

     

                    You are correct that the memcpy for ramfuncs is inside main.

     

                    There is no cinit routine in the code.  Is this something I need to have?  Or is it automatically added during the build?

     

                    In the map and cmd file, is there something specific I should look for?

     

    Thank you,

     

    Ed

  • 0 in reply to Edward Sanders
    TI__Mastermind 19810 points

    Ed,

    the cinit routine comes from the C runtime library. I'm not sure if there would be a warning if the runtime code overlaps with stack or other sections. It will if the LOADED code overlaps with other sections. 

    In the MAP file and CMD file, pick the sections where the runtime code will be copied and see if there is any other section using the same address range.

    Best Regards

    Santosh Athuru

  • 0
    Intellectual 985 points

    Would be nice if you could post your linker script and the map file.

    Janos

  • 0 in reply to Janos Szeman
    Intellectual 430 points

    All,

     

                    I have checked it and don’t see anything.  The ramfuncs area is in RAML0, starts at 0x8000, and is 0x6e1 in length.  The stack is also in RAML0, and begins at 0x86e2, and is 0x300 in length.  So the two don’t overlap, and together are consuming a little over half of the available RAM.  There is nothing else that I can see in that area.  I have included the cmd file and the map file which I edited to reduce its size.  There is still a lot though.  Sorry.

     

    F28335.cmd

    // TI File $Revision: /main/10 $

    // Checkin $Date: July 9, 2008   13:43:56 $

    //###########################################################################

     

    MEMORY

    {

    PAGE 0:

     

       ZONE0       : origin = 0x004000, length = 0x001000

       RAML0       : origin = 0x008000, length = 0x001000

       RAML1       : origin = 0x009000, length = 0x001000

       RAML2       : origin = 0x00A000, length = 0x001000

       RAML3       : origin = 0x00B000, length = 0x001000

       ZONE6       : origin = 0x0100000, length = 0x100000

       ZONE7A      : origin = 0x0200000, length = 0x00FC00

       FLASHH      : origin = 0x300000, length = 0x008000

       FLASHG      : origin = 0x308000, length = 0x008000

       FLASHF      : origin = 0x310000, length = 0x008000

       FLASHE      : origin = 0x318000, length = 0x008000

       FLASHD      : origin = 0x320000, length = 0x008000

       FLASHC      : origin = 0x328000, length = 0x008000

       CRCMEM      : origin = 0x338000, length = 0x000002

       FLASHA      : origin = 0x338002, length = 0x007F7E

       CSM_RSVD    : origin = 0x33FF80, length = 0x000076

       BEGIN       : origin = 0x33FFF6, length = 0x000002

       CSM_PWL     : origin = 0x33FFF8, length = 0x000008

       OTP         : origin = 0x380400, length = 0x000400

       ADC_CAL     : origin = 0x380080, length = 0x000009

      

       IQTABLES    : origin = 0x3FE000, length = 0x000b50

       IQTABLES2   : origin = 0x3FEB50, length = 0x00008c

       FPUTABLES   : origin = 0x3FEBDC, length = 0x0006A0

       ROM         : origin = 0x3FF27C, length = 0x000D44

       RESET       : origin = 0x3FFFC0, length = 0x000002

       VECTORS     : origin = 0x3FFFC2, length = 0x00003E

     

    PAGE 1 :

     

       BOOT_RSVD   : origin = 0x000000, length = 0x000050

       RAMM0       : origin = 0x000050, length = 0x0003B0

       RAMM1       : origin = 0x000400, length = 0x000400

       RAML4       : origin = 0x00C000, length = 0x001000

       RAML56      : origin = 0x00D000, length = 0x002000

       RAML7       : origin = 0x00F000, length = 0x001000

       ZONE7B      : origin = 0x20FC00, length = 0x000400

       FLASHB      : origin = 0x330000, length = 0x008000

    }

     

     

    SECTIONS

    {

       .CrcValue           : > CRCMEM      PAGE = 0

       .cinit              : > FLASHA      PAGE = 0

       .pinit              : > FLASHA,     PAGE = 0

       .text               : > FLASHA,

                            LOAD_START(_TextStart),

                             LOAD_END(_TextEnd),

                             PAGE = 0

       codestart           : > BEGIN       PAGE = 0

       ramfuncs            : LOAD = FLASHA,

                             RUN = RAML0,

                             LOAD_START(_RamfuncsLoadStart),

                             LOAD_END(_RamfuncsLoadEnd),

                             RUN_START(_RamfuncsRunStart),

                             PAGE = 0

     

       csmpasswds          : > CSM_PWL     PAGE = 0

       csm_rsvd            : > CSM_RSVD    PAGE = 0

      

       .stack              : > RAML0       PAGE = 0

       .ebss               : > RAML1       PAGE = 0

       .GlobalData         : > RAML2       PAGE = 0

       .esysmem            : > RAMM1       PAGE = 1

     

       .econst            : > FLASHA

                             LOAD_START(_EconstStart),

                             LOAD_END(_EconstEnd),

                             PAGE = 0

       .switch             : > FLASHA      PAGE = 0     

     

       IQmath              : > FLASHC      PAGE = 0

       IQmathTables     : > IQTABLES,  PAGE = 0, TYPE = NOLOAD

      

       FPUmathTables    : > FPUTABLES, PAGE = 0, TYPE = NOLOAD

            

       .Buffers         : > RAML4,     PAGE = 1

       .ProcessingBuffs : > RAML56,    PAGE = 1

       .Results         : > RAML7,     PAGE = 1

     

       ZONE7DATA        : > ZONE7B,    PAGE = 1

     

       .reset              : > RESET,      PAGE = 0, TYPE = DSECT

       vectors             : > VECTORS     PAGE = 0, TYPE = DSECT

      

       .adc_cal     : load = ADC_CAL,   PAGE = 0, TYPE = NOLOAD

     

    }

     

     

    map file

    ******************************************************************************

                 TMS320C2000 Linker PC v6.4.6                     

    ******************************************************************************

    >> Linked Mon Mar 14 16:34:00 2016

     

    OUTPUT FILE NAME:   <Proj.out>

    ENTRY POINT SYMBOL: "_c_int00" address: 00339c25

     

     

    MEMORY CONFIGURATION

     

             name            origin    length      used     unused   attr    fill

    ---------------------- --------  ---------  --------  --------  ----  --------

    PAGE 0:

      ZONE0                 00004000   00001000  00000000  00001000  RWIX

      RAML0                 00008000   00001000  000009e1  0000061f  RWIX

      RAML1                 00009000   00001000  00000188  00000e78  RWIX

      RAML2                 0000a000   00001000  0000000a  00000ff6  RWIX

      RAML3                 0000b000   00001000  00000000  00001000  RWIX

      ZONE6                 00100000   00100000  00000000  00100000  RWIX

      ZONE7A                00200000   0000fc00  00000000  0000fc00  RWIX

      FLASHH                00300000   00008000  00000000  00008000  RWIX

      FLASHG                00308000   00008000  00000000  00008000  RWIX

      FLASHF                00310000   00008000  00000000  00008000  RWIX

      FLASHE                00318000   00008000  00000000  00008000  RWIX

      FLASHD                00320000   00008000  00000000  00008000  RWIX

      FLASHC                00328000   00008000  00000000  00008000  RWIX

      CRCMEM              00338000   00000002  00000002  00000000  RWIX

      FLASHA                00338002   00007f7e  000023e8  00005b96  RWIX

      CSM_RSVD              0033ff80   00000076  00000000  00000076  RWIX

      BEGIN                 0033fff6   00000002  00000002  00000000  RWIX

      CSM_PWL               0033fff8   00000008  00000000  00000008  RWIX

      ADC_CAL               00380080   00000009  00000007  00000002  RWIX

      OTP                   00380400   00000400  00000000  00000400  RWIX

      IQTABLES              003fe000   00000b50  00000000  00000b50  RWIX

      IQTABLES2             003feb50   0000008c  00000000  0000008c  RWIX

      FPUTABLES             003febdc   000006a0  00000000  000006a0  RWIX

      ROM                   003ff27c   00000d44  00000000  00000d44  RWIX

      RESET                003fffc0   00000002  00000000  00000002  RWIX

      VECTORS               003fffc2   0000003e  00000000  0000003e  RWIX

     

    PAGE 1:

      BOOT_RSVD             00000000   00000050  00000000  00000050  RWIX

      RAMM0                 00000050   000003b0  00000000  000003b0  RWIX

      RAMM1                 00000400   00000400  00000400  00000000  RWIX

      DEV_EMU               00000880   00000180  000000d0  000000b0  RWIX

      FLASH_REGS            00000a80   00000060  00000008  00000058  RWIX

      CSM                   00000ae0   00000010  00000010  00000000  RWIX

      ADC_MIRROR            00000b00   00000010  00000010  00000000  RWIX

      XINTF                 00000b20   00000020  0000001e  00000002  RWIX

      CPU_TIMER0            00000c00   00000008  00000008  00000000  RWIX

      CPU_TIMER1            00000c08   00000008  00000008  00000000  RWIX

      CPU_TIMER2            00000c10   00000008  00000008  00000000  RWIX

      PIE_CTRL              00000ce0   00000020  0000001a  00000006  RWIX

      PIE_VECT              00000d00   00000100  00000100  00000000  RWIX

      DMA                   00001000   00000200  000000e0  00000120  RWIX

      MCBSPA                00005000   00000040  00000025  0000001b  RWIX

      MCBSPB                00005040   00000040  00000025  0000001b  RWIX

      ECANA                00006000   00000040  00000034  0000000c  RWIX

      ECANA_LAM             00006040   00000040  00000040  00000000  RWIX

      ECANA_MOTS            00006080   00000040  00000040  00000000  RWIX

      ECANA_MOTO            000060c0   00000040  00000040  00000000  RWIX

      ECANA_MBOX            00006100   00000100  00000100  00000000  RWIX

      ECANB                 00006200   00000040  00000034  0000000c  RWIX

      ECANB_LAM             00006240   00000040  00000040  00000000  RWIX

      ECANB_MOTS            00006280   00000040  00000040  00000000  RWIX

      ECANB_MOTO            000062c0   00000040  00000040  00000000  RWIX

      ECANB_MBOX            00006300   00000100  00000100  00000000  RWIX

      EPWM1                 00006800   00000022  00000022  00000000  RWIX

      EPWM2                00006840   00000022  00000022  00000000  RWIX

      EPWM3                 00006880   00000022  00000022  00000000  RWIX

      EPWM4                 000068c0   00000022  00000022  00000000  RWIX

      EPWM5                 00006900   00000022  00000022  00000000  RWIX

      EPWM6                 00006940   00000022  00000022  00000000  RWIX

      ECAP1                 00006a00   00000020  00000020  00000000  RWIX

      ECAP2                 00006a20   00000020  00000020  00000000  RWIX

      ECAP3                 00006a40   00000020  00000020  00000000  RWIX

      ECAP4                 00006a60   00000020  00000020  00000000  RWIX

      ECAP5                 00006a80   00000020  00000020  00000000  RWIX

      ECAP6                 00006aa0   00000020  00000020  00000000  RWIX

      EQEP1                 00006b00   00000040  00000040  00000000  RWIX

      EQEP2                 00006b40   00000040  00000040  00000000  RWIX

      GPIOCTRL              00006f80   00000040  0000002e  00000012  RWIX

      GPIODAT               00006fc0   00000020  00000020  00000000  RWIX

      GPIOINT               00006fe0   00000020  0000000a  00000016  RWIX

      SYSTEM                00007010   00000020  00000020  00000000  RWIX

      SPIA                  00007040   00000010  00000010  00000000  RWIX

      SCIA                00007050   00000010  00000010  00000000  RWIX

      XINTRUPT              00007070   00000010  00000010  00000000  RWIX

      ADC                   00007100   00000020  0000001e  00000002  RWIX

      SCIB                  00007750   00000010  00000010  00000000  RWIX

      SCIC                  00007770   00000010  00000010  00000000  RWIX

      I2CA                  00007900   00000040  00000022  0000001e  RWIX

      RAML4                 0000c000   00001000  00001000  00000000  RWIX

      RAML56                0000d000   00002000  00001180  00000e80  RWIX

      RAML7                 0000f000   00001000  00001000  00000000  RWIX

      ZONE7B                0020fc00   00000400  00000000  00000400  RWIX

      FLASHB                00330000   00008000  00000000  00008000  RWIX

      CSM_PWL              0033fff8   00000008  00000008  00000000  RWIX

      PARTID                00380090   00000001  00000001  00000000  RWIX

     

     

    SECTION ALLOCATION MAP

     

     output                                  attributes/

    section   page    origin      length       input sections

    -------- ----  ----------  ----------   ----------------

    .stack     0    000086e2    00000300     UNINITIALIZED

                      000086e2    00000300     --HOLE--

     

    .ebss     0    00009000    00000188     UNINITIALIZED

                      00009000    00000142

                      00009142    00000018

                      0000915a    00000008

                      00009162    00000006

                      00009168    00000005

                      0000916d    00000001

                      0000916e    00000004

                      00009172    00000004

                      00009176    00000004

                      0000917a    00000002

                      0000917c    00000002

                      0000917e    00000002

                      00009180    00000002

                      00009182    00000002

                      00009184    00000002

                      00009186    00000001

                      00009187    00000001

     

    .GlobalData

    *         0    0000a000    0000000a     UNINITIALIZED

                      0000a000    0000000a

     

    .CrcValue

    *         0    00338000    00000002    

                      00338000    00000002

     

    ramfuncs   0    00338002    000006e1     RUN ADDR = 00008000

                      00338002    000000fe

                      00338100    000000ce

                      003381ce    000000ba

                      00338288    000000b9

                      00338341    000000a7

                      003383e8    000000a5

                      0033848d    0000009c

                      00338529    00000089

                      003385b2    0000006b

                      0033861d    00000032

                      0033864f    0000002b

                      0033867a    00000029

                      003386a3    00000021

                      003386c4    0000001b

                      003386df    00000004

     

    .text     0    003386e4    00001970    

                      003386e4    000003e9

                      00338acd    00000316

                      00338de3    00000203

                      00338fe6    000001e2

                      003391c8    000001bf

                      00339387    00000133

                      003394ba    000000f8

                      003395b2    0000009f

                      00339651    00000088

                      003396d9    00000086

                      0033975f    0000007c

                      003397db    00000076

                      00339851    00000073

                      003398c4    00000073

                      00339937    00000071

                      003399a8    00000068

                      00339a10    00000062

                      00339a72    00000061

                      00339ad3    0000005b

                      00339b2e    00000058

                      00339b86    00000050

                      00339bd6    0000004f

                      00339c25    00000046

                      00339c6b    00000045

                      00339cb0    00000036

                      00339ce6    00000034

                      00339d1a    00000033

                      00339d4d    0000002d

                      00339d7a    00000028

                      00339da2    00000028

                      00339dca    00000028

                      00339df2    00000024

                      00339e16    00000024

                      00339e3a    00000022

                      00339e5c    00000022

                      00339e7e    00000020

                      00339e9e    0000001e

                      00339ebc    0000001e

                      00339eda    0000001c

                      00339ef6    0000001a

                      00339f10    00000019

                      00339f29    00000019

                      00339f42    00000016

                      00339f58    00000016

                      00339f6e    00000016

                      00339f84    00000015

                      00339f99    00000014

                      00339fad    00000014

                      00339fc1    00000014

                      00339fd5    00000013

                      00339fe8    00000013

                      00339ffb    0000000e

                      0033a009    0000000c

                      0033a015    00000009

                      0033a01e    00000007

                      0033a025    00000007

                      0033a02c    00000006

                      0033a032    00000005

                      0033a037    00000005

                      0033a03c    00000004

                      0033a040    00000004

                      0033a044    00000003

                      0033a047    00000003

                      0033a04a    00000003

                    0033a04d    00000003

                      0033a050    00000001

                      0033a051    00000001

                      0033a052    00000001

                      0033a053    00000001

     

    .econst   0    0033a054    00000360    

                      0033a054    00000200

                      0033a254    00000100

                      0033a354    0000002a

                      0033a37e    0000002a

                      0033a3a8    00000004

                      0033a3ac    00000004

                      0033a3b0    00000004

     

    .cinit     0    0033a3b4    00000031    

                      0033a3b4    0000000a

                      0033a3be    00000005

                      0033a3c3    00000005

                      0033a3c8    00000005

                      0033a3cd    00000005

                     0033a3d2    00000005

                      0033a3d7    00000004

                      0033a3db    00000004

                      0033a3df    00000004

                      0033a3e3    00000002

     

    .pinit     0    0033a3e6    00000006    

                      0033a3e6    00000002

                      0033a3e8    00000002

                      0033a3ea    00000002

     

    codestart

    *         0    0033fff6    00000002    

                      0033fff6    00000002

     

    .adc_cal   0    00380080    00000007

                      00380080    00000007

     

    .esysmem   1    00000400    00000400

                      00000400    00000001

                      00000401    000003ff

     

    DevEmuRegsFile

    *         1    00000880    000000d0

                      00000880    000000d0

     

    FlashRegsFile

    *         1    00000a80    00000008

                      00000a80    00000008

     

    CsmRegsFile

    *         1    00000ae0    00000010

                      00000ae0    00000010

     

    AdcMirrorFile

    *         1    00000b00    00000010

                      00000b00   00000010

     

    XintfRegsFile

    *         1    00000b20    0000001e

                      00000b20    0000001e

     

    CpuTimer0RegsFile

    *         1    00000c00    00000008

                      00000c00    00000008

     

    CpuTimer1RegsFile

    *         1    00000c08    00000008

                      00000c08    00000008

     

    CpuTimer2RegsFile

    *         1    00000c10    00000008

                      00000c10    00000008

     

    PieCtrlRegsFile

    *         1    00000ce0    0000001a

                      00000ce0    0000001a

     

    PieVectTableFile

    *          1    00000d00    00000100

                      00000d00    00000100

     

    DmaRegsFile

    *         1    00001000    000000e0

                      00001000    000000e0

     

    McbspaRegsFile

    *         1    00005000    00000025

                      00005000    00000025

     

    McbspbRegsFile

    *         1    00005040    00000025

                      00005040    00000025

     

    ECanaRegsFile

    *         1    00006000    00000034

                      00006000    00000034

     

    ECanaLAMRegsFile

    *         1    00006040    00000040

                    00006040    00000040

     

    ECanaMOTSRegsFile

    *         1    00006080    00000040

                      00006080    00000040

     

    ECanaMOTORegsFile

    *         1    000060c0    00000040

                      000060c0    00000040

     

    ECanaMboxesFile

    *         1    00006100    00000100

                      00006100    00000100

     

    ECanbRegsFile

    *         1    00006200    00000034

                      00006200    00000034

     

    ECanbLAMRegsFile

    *         1    00006240    00000040

                      00006240    00000040

     

    ECanbMOTSRegsFile

    *         1    00006280    00000040

                      00006280    00000040

     

    ECanbMOTORegsFile

    *         1    000062c0    00000040

                      000062c0    00000040

     

    ECanbMboxesFile

    *         1    00006300    00000100

                    00006300    00000100

     

    EPwm1RegsFile

    *         1    00006800    00000022

                      00006800    00000022

     

    EPwm2RegsFile

    *         1    00006840    00000022

                      00006840    00000022

     

    EPwm3RegsFile

    *         1    00006880   00000022

                      00006880    00000022

     

    EPwm4RegsFile

    *         1    000068c0    00000022

                      000068c0    00000022

     

    EPwm5RegsFile

    *         1    00006900    00000022

                      00006900    00000022

     

    EPwm6RegsFile

    *         1    00006940    00000022

                      00006940    00000022

     

    ECap1RegsFile

    *         1    00006a00    00000020

                      00006a00    00000020

     

    ECap2RegsFile

    *         1    00006a20    00000020

                      00006a20    00000020

     

    ECap3RegsFile

    *         1    00006a40    00000020

                      00006a40    00000020

     

    ECap4RegsFile

    *         1    00006a60    00000020

                      00006a60    00000020

     

    ECap5RegsFile

    *         1    00006a80    00000020

                      00006a80    00000020

     

    ECap6RegsFile

    *         1    00006aa0    00000020

                      00006aa0    00000020

     

    EQep1RegsFile

    *         1    00006b00    00000040

                      00006b00    00000040

     

    EQep2RegsFile

    *         1    00006b40    00000040

                      00006b40    00000040

     

    GpioCtrlRegsFile

    *         1    00006f80    0000002e

                      00006f80    0000002e

     

    GpioDataRegsFile

    *         1    00006fc0    00000020

                      00006fc0    00000020

     

    GpioIntRegsFile

    *         1    00006fe0    0000000a

                      00006fe0    0000000a

     

    SysCtrlRegsFile

    *         1    00007010    00000020

                      00007010    00000020

     

    SpiaRegsFile

    *         1    00007040    00000010

                      00007040    00000010

     

    SciaRegsFile

    *         1    00007050    00000010

                      00007050    00000010

     

    XIntruptRegsFile

    *         1    00007070    00000010

                      00007070    00000010

     

    AdcRegsFile

    *         1    00007100    0000001e

                      00007100    0000001e

     

    ScibRegsFile

    *         1    00007750    00000010

                      00007750    00000010

     

    ScicRegsFile

    *         1    00007770    00000010

                      00007770    00000010

     

    I2caRegsFile

    *         1    00007900    00000022

                      00007900    00000022

     

    CsmPwlFile

    *         1    0033fff8    00000008

                      0033fff8    00000008

     

    PartIdRegsFile

    *         1    00380090    00000001

                      00380090    00000001

     

    .Buffers   1    0000c000    00001000

                      0000c000    00001000

     

    .ProcessingBuffs

    *         1    0000d000    00001180

                      0000d000    00001180

     

    .DftResults

    *         1    0000f000    00001000

                      0000f000    00001000

     

    .reset     0    003fffc0    00000002

                      003fffc0    00000002

     

    vectors   0    003fffc2    00000000

     

    Thank you,

     

    Ed

  • 0 in reply to Edward Sanders
    Intellectual 985 points

    Hello Ed,

    The files look ok. I don't see anything suspicious, but please make sure that symbol _c_int00 is listed in the parts you edited out from the map file.

    One thing you could try: place a breakpoint at this instruction: LB _c_int00. This must be in something called xxxxxx_CodeStartBranch.asm. This is the instruction the ROM bootloader will jump to after finishing doing its thing. Watching what it does may give you a clue about what is happening.

    BR,

    Janos

  • 0 in reply to Janos Szeman
    Intellectual 430 points

    Hi Janos,

     

                    The map file does contain a reference to _c_int00 as follows:

     

    0     00339c25 _c_int00                                            

     

    I put a breakpoint in CodeStartBranch.asm and hit that. Single stepping, I found myself in boot28.inc.  In the PROCESS PINIT SECTION (that’s what it says in the comment block directly above it), it gets to LOOP_PINIT:, and proceeds to the LCR instruction.  There is no return from that, and the system restarts.  I can’t even step into that without the reset.  What does that mean?

     

    Thanks,

     

    Ed

  • 0 in reply to Edward Sanders
    Intellectual 985 points

    Hi Ed,

    Quote from the compiler docs:

    All global C++ variables that have constructors must have their constructor called before main(). The
    compiler builds a table in a section called .pinit of global constructor addresses that must be called, in
    order, before main(). The linker combines the .pinit section form each input file to form a single table in the
    .pinit section. The boot routine uses this table to execute the constructors.

    I have never worked with C++ on C28 before so this is just a theory: I guess you have some C++ code you intended to run from the RAM and the pinit tries to run constructors from the RAM before your main had the chance to copy the code from flash to RAM.

    We can check it by reading the .pinit section from the flash (6 words between 0x0033a3e6 and 0x0033a3ec). 

    Regards,
    Janos

  • 0 in reply to Janos Szeman
    Intellectual 430 points

    Hi Janos,

     

                    The six words at that address are all 0xFFFF.

     

                    But the part about the constructors makes sense because I had just tried to move a couple of constructors to the ramfuncs area.  When I removed the attempt to move them, it started to work again.  Do you know of a way that I can move the constructors to RAM?

     

    Thank you,

     

    Ed

     

  • 0 in reply to Edward Sanders
    Intellectual 985 points
    This is odd. I expected them to be pointing in the RAM somewhere and the last one to be zero. This makes it harder to fix it. Anyway, this is the reason why you can't debug your code when constructors are in RAM.

    I am not aware of any way of letting the boot function know where the constructors really are. If somehow you could convince the linker to place the flash addresses there, that would solve the problem.

    There might be couple of ways to make C++ objects work from RAM but anything I can think of is ugly and on the other hand this is not what you asked.
  • 0 in reply to Edward Sanders
    TI__Mastermind 19810 points
    Ed,
    is this a C++ project?
    can you move the below sections to PAGE 1 memory sections, instead of PAGE 0? Not sure what global data is, I don't see it in the MAP file.


    .stack : > RAML0 PAGE = 0
    .ebss : > RAML1 PAGE = 0
    .GlobalData : > RAML2 PAGE = 0


    Best Regards
    Santosh Athuru
  • 0 in reply to Santosh Athuru
    Intellectual 430 points
    All,
    I determined that constructors were being called during the initialization process before it would get to main(). I’m presuming that these are being called to construct the global objects before the program is called. When I stopped trying to move the constructors, the problem went away. I have now moved nearly everything, excluding the constructors with no further incident.

    Ed