TMS570LC4357: Data abort when run code in Ram

Hi,

thanks for your reply, my objective is to run from RAM a section of code with a  size greater than 0x4000 byte but, in my test, the code generate the data abort exception after few RAM instruction.

I cannot post my real project and  for this reason i tried replicate my problem executing in RAM the FEE_TEXT_SECTION (that has a size similar to the code that i wanto to run in RAM), the behaviour is the same, after a few instruction execute in ram of the TI_Fee_Init function the code fall in data abort execption.

The code will be copied from flash to ram in the __TI_auto_init(), in the linker file is indicate to use the binit table ( FEE_TEXT_SECTION    :> FLASH0 | FLASH1  palign(32), run > RAM table(BINIT)).

If i change the linker line from "FEE_TEXT_SECTION    :> FLASH0 | FLASH1  palign(32), run > RAM table(BINIT)" to "FEE_TEXT_SECTION    :> FLASH0 | FLASH1  palign(32)" the TI_Fee_Init function is executed correclty.

Looking the disassembly of the TI_Fee_Init function in this 2 cases ( code in RAM and  the code in flash), seems that the generated assemby instructions differs, tomorrow i'll try to catch 2 screenshot to explain better my idea.

Thanks,

Giovanni

here the 2 screenshot,

the first is the code executed in flash and in the second the code is executed in ram, the only change between the 2 projects is the linker file ( there are no optimization in the project's settings).

the disassembly of the "TI_Fee_u32BlockEraseCount = 0xFFFFFFFFU;" and the next instruction are different.

Hi,

this problem is already present and I cannot find a solution, running big section of code from ram will cause the data abort.
The time for my project is running out and if there are no solution we need to change this device.
I just need to know if the behaviour of the submitted code is correct or not and which is the right method to run code from the RAM of the TMS570 ( and what is the poblem in my code, i know that is not necessary to run the TI_Fee_Init from RAM but why it didnt work?) .
Thanks, best regards

Giovanni

ok,

thanks, i have followed the guide in  and i understand that the copy form flash to ram is done in the the __TI_auto_init function using the binit table set in the linker. ( it work if the  code section copied form flash to RAM  is small)

So this method is not usable? it is better make a custom flash to ram function?

Hi,

sorry for late, i have just tried your solution.

I have modified the linker, added the asm code in the HL_sys_core.asm and called it in the HL_sys_startup.c  after the __TI_auto_init() function.

In the linker i just do a little modification:

FEE_TEXT_SECTION    :> FEE_API, run = RAM, LOAD_START(api_load), LOAD_END(api_end), RUN_START(api_run), SIZE(api_size)

insted of

feeAPI :
{
TI_Fee_Init.obj (.text)
} load = FEE_API, run = SRAM, LOAD_START(api_load), LOAD_END(api_end), RUN_START(api_run), SIZE(api_size)

due the fee code is loaded in that section by pragma.

The code fall anyway in the data abort exception during the execution of the TI_Fee_Init function.

Just for confirmation if i run the code from flash the TI_Fee_Init function execution is ok.

Thanks for your support,

Giovanni