TMS320F28379D: Copy function from FLASH to RAM accross mutliple memory ranges

Nathan PHILIPPE

Part Number: TMS320F28379D

Hello,

To use the CLA, I have the Cla1Prog section that copy code from FLASH to RAM. My CLA programs take more than memory space of one section, so I merged two sections as it is in C2000 example:

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RAMLS2_3        : origin = 0x009000, length = 0x001000
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

RAMLS2_3      	: origin = 0x009000, length = 0x001000

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        Cla1Prog    : LOAD = FLASHFG,
                      RUN = RAMLS2_3,
                      LOAD_START(Cla1funcsLoadStart),
                      LOAD_END(Cla1funcsLoadEnd),
                      RUN_START(Cla1funcsRunStart),
                      LOAD_SIZE(Cla1funcsLoadSize),
                      PAGE = 0, ALIGN(8)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

	   	Cla1Prog    : LOAD = FLASHFG,
	                  RUN = RAMLS2_3,
	                  LOAD_START(Cla1funcsLoadStart),
	                  LOAD_END(Cla1funcsLoadEnd),
	                  RUN_START(Cla1funcsRunStart),
	                  LOAD_SIZE(Cla1funcsLoadSize),
	                  PAGE = 0, ALIGN(8)

But I would prefer to keep initial memory division and split code into multiple memory range. I tried the following code but it does not compile:

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   RAMLS2       : origin = 0x009000, length = 0x000800
   RAMLS3       : origin = 0x009800, length = 0x000800
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

   RAMLS2      	: origin = 0x009000, length = 0x000800
   RAMLS3      	: origin = 0x009800, length = 0x000800

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        Cla1Prog    : LOAD = FLASHFG,
                      RUN = >> RAMLS2 | RAMLS3,
                      LOAD_START(_Cla1funcsLoadStart),
                      LOAD_END(_Cla1funcsLoadEnd),
                      RUN_START(_Cla1funcsRunStart),
                      LOAD_SIZE(_Cla1funcsLoadSize),
                      PAGE = 0, ALIGN(8)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

	    Cla1Prog    : LOAD = FLASHFG,
	                  RUN = >> RAMLS2 | RAMLS3,
	                  LOAD_START(_Cla1funcsLoadStart),
	                  LOAD_END(_Cla1funcsLoadEnd),
	                  RUN_START(_Cla1funcsRunStart),
	                  LOAD_SIZE(_Cla1funcsLoadSize),
	                  PAGE = 0, ALIGN(8)

Note that even though my code does not compile, the Cla program are correctly mapped and split into two output sections with a length corresponding to my memory ranges.

So I would to know if it is really possible to do what I want to do and how to do so, or if I should keep merged memory range.

Thank you.

over 3 years ago

+1 Veena Kamath over 3 years ago

TI__Mastermind 32435 points

Hi,

You cannot use the LOAD_START,SIZE features if you want to split the section into multiple blocks. Since your linker cmd file uses these function, the linker will ignore ">>" operator and treat it as ">" operators where the section is placed either in LS2 or in LS3, not split between these 2.

If you want to split, you can still use >> operator , but you may need to use copyTable method for performing the copy.

For example :

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    Cla1Prog             :    LOAD >  FLASH_BANK0_SEC0,
                              RUN  >> RAMLS1 | RAMLS2,
                              TABLE(copyTable_cla1Prog),
                              ALIGN(8)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

    Cla1Prog             :    LOAD >  FLASH_BANK0_SEC0,
                              RUN  >> RAMLS1 | RAMLS2,
                              TABLE(copyTable_cla1Prog),
                              ALIGN(8)

Instead of using memcpy with Cla1funcsLoadStart, Cla1funcsRunStart, Cla1funcsLoadSize, you can use the function

copy_in(&copyTable_cla1Prog);

For more details, https://www.ti.com/lit/an/spraa46a/spraa46a.pdf

Regards,

Veena

0 Veena Kamath over 3 years ago in reply to Veena Kamath

TI__Mastermind 32435 points

E2E thread on similar topic : https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/code-composer-studio-forum/415825/c2000-splitting-sections-in-memory-when-specifying-separate-load-and-run-addresses

0 Nathan PHILIPPE over 3 years ago in reply to Veena Kamath

Prodigy 30 points

Thank you for your answer,

It works well, I just needed to add an underscore for _copyTable_cla1Prog in the linker.

Also I think it is necessary to add the .ovly section int he linker to store the tables on FLASH.

0 Veena Kamath over 3 years ago in reply to Nathan PHILIPPE

TI__Mastermind 32435 points

Right, _ is required for COFF format. .ovly is the section where the copy tables ae saved and need to be allocated to a memory

Regards,

Veena

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TMS320F28379D: Copy function from FLASH to RAM accross mutliple memory ranges