TMS320F28379D: Linker file changes to flash for using dclfuncs

Prashant Gugle

Hi Sir/Madam,

I am using dclfuncs and DCL_refgen in RAM fw. What changes we need to do in flash linker command file , so that I can use these function?

Thanks and Regards,

Prashant Gugle

2 months ago

0 Ira Thete 2 months ago

TI__Expert 3175 points

Hi Prashant,

I will get back to you in 1 day.

Thanks,

Ira

0 Ira Thete 2 months ago in reply to Ira Thete

TI__Expert 3175 points

Hi Prashant,

DCL functions must load from Flash but execute from RAM. This means your flash linker command file needs a dual LOAD/RUN address configuration for the dclfuncs section, plus a memcpy() call at startup to physically transfer the code from Flash to RAM before any DCL function is invoked. You can modifiy your linker cmd in the following way.

So if your project already has a .TI.ramfunc section, then just add dclfuncs to the same group. You will have to create a GROUP for All LOAD/RUN specifiers automatically apply to both sections.

For example

GROUP : LOAD = FLASH_BANK0_SEC7,
RUN = RAMLS0_RAMLS1,
START(RamfuncsRunStart),
LOAD(RamfuncsLoadStart),
SIZE(RamfuncsLoadSize)
{
.TI.ramfunc
dclfuncs
}

If you don't have an existing .TI.ramfunc section then you can create one for dclfuncs so it runs from RAM. So you can add something like this in your SECTIONS block in the linker cmd file.

dclfuncs : LOAD = FLASH_BANK0_SEC7,
RUN = RAMLS0_RAMLS1,
START(DCLfuncsRunStart),
LOAD(DCLfuncsLoadStart),
SIZE(DCLfuncsLoadSize),
ALIGN(8),
PAGE = 0

Now you also need to copy the DCL functions from Flash to RAM before you make any DCL calls. SO oyu can add this to your startup code - in main.c after initPieVectTable() or even in device.c

// Declare linker-generated symbols
extern uint32_t DCLfuncsRunStart;
extern uint32_t DCLfuncsLoadStart;
extern uint32_t DCLfuncsLoadSize;

// Copy DCL functions from Flash to RAM
memcpy((uint32_t *)&DCLfuncsRunStart,
(uint32_t *)&DCLfuncsLoadStart,
(uint32_t)&DCLfuncsLoadSize);

Rebuild your project after this.

Thanks,

Ira

0 Prashant Gugle 2 months ago in reply to Ira Thete

Intellectual 260 points

Hi Ira,

Since I have .TI.ramfunc in #ifdef I will have to do it 3 times

#ifdef __TI_COMPILER_VERSION__
    #if __TI_COMPILER_VERSION__ >= 15009000
        #if defined(__TI_EABI__)
            GROUP :  LOAD = FLASHD,
                                 RUN = RAMLS0,
                                 LOAD_START(RamfuncsLoadStart),
                                 LOAD_SIZE(RamfuncsLoadSize),
                                 LOAD_END(RamfuncsLoadEnd),
                                 RUN_START(RamfuncsRunStart),
                                 RUN_SIZE(RamfuncsRunSize),
                                 RUN_END(RamfuncsRunEnd),
                                 PAGE = 0, ALIGN(8)
                                 {
                                   .TI.ramfunc
                                    dclfuncs
                                 }
        #else
            GROUP :  LOAD = FLASHD,
                             RUN = RAMLS0,
                             LOAD_START(_RamfuncsLoadStart),
                             LOAD_SIZE(_RamfuncsLoadSize),
                             LOAD_END(_RamfuncsLoadEnd),
                             RUN_START(_RamfuncsRunStart),
                             RUN_SIZE(_RamfuncsRunSize),
                             RUN_END(_RamfuncsRunEnd),
                             PAGE = 0, ALIGN(8)
                              {
                                .TI.ramfunc
                                 dclfuncs
                              }

        #endif
    #else
        GROUP : LOAD = FLASHD,
                         RUN = RAMLS0,
                         LOAD_START(_RamfuncsLoadStart),
                         LOAD_SIZE(_RamfuncsLoadSize),
                         LOAD_END(_RamfuncsLoadEnd),
                         RUN_START(_RamfuncsRunStart),
                         RUN_SIZE(_RamfuncsRunSize),
                         RUN_END(_RamfuncsRunEnd),
                         PAGE = 0, ALIGN(8)
                         {
                           ramfuncs
                           dclfuncs
                         }
    #endif

#endif

And I don't need to copy this right?

// Copy DCL functions from Flash to RAM
memcpy((uint32_t *)&DCLfuncsRunStart, (uint32_t *)&DCLfuncsLoadStart,(uint32_t)&DCLfuncsLoadSize);

Thanks and Regards,

Prashant Gugle

0 Ira Thete 2 months ago in reply to Prashant Gugle

TI__Expert 3175 points

Hi Prashant,

Correct, you have to add dclfuncs in all the 3 cases. You will have to do the memcpy() in your startup routine as well. You can directly say memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);

Because SIZE(RamfuncsLoadSize) covers the combined size of .TI.ramfunc + dclfuncs, this single memcpy() call copies both sections in one shot.

Thanks,

Ira

0 Prashant Gugle 2 months ago in reply to Ira Thete

Intellectual 260 points

Hi Ira,

I have copied in all the 3 cases dclfuncs and also added memcpy function after device_init() in main().

Thanks and Regards,

Prashant Gugle

0 Prashant Gugle 2 months ago in reply to Prashant Gugle

Intellectual 260 points

Hi Ira,

memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);

was already there in device.c file.

Thanks and Regards,

Prashant Gugle

0 Ira Thete 2 months ago in reply to Prashant Gugle

TI__Expert 3175 points

Hi Prashant,

Is the project working as expected i.e. are you able to run the DCL functions?

Thanks,

Ira

0 Prashant Gugle 2 months ago in reply to Ira Thete

Intellectual 260 points

Hi Ira,

Project is working as expected and I am able to run DCL functions.

Thanks and Regards,

Prashant Gugle

0 Ira Thete 2 months ago in reply to Prashant Gugle

TI__Expert 3175 points

Okay, good to know. I am closing this thread.

Thanks and Regards,

Ira

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TMS320F28379D: Linker file changes to flash for using dclfuncs