TMS320F280039C: Load sections from Flash to RAM

Johnny Chen

Part Number: TMS320F280039C

Hi Champ,

I am asking for my customer.

They are adding RAM functions, while the compiler has an error if the function size is greater than a sector with using "LOAD = …" (.TI.ramfunc : LOAD = FLASH_BANK0_SEC1 | FLASH_BANK0_SEC2 | FLASH_BANK0_SEC3), and it passes with using " >> " (.TI.ramfunc : >> FLASH_BANK0_SEC1 | FLASH_BANK0_SEC2 | FLASH_BANK0_SEC3).

1. In this condition (function is greater than a sector), what is the difference between these 2 syntaxes ?

2. Is the error related to the allocation onto the boundaries ?

Thanks and regards,

Johnny

over 3 years ago

0 Santosh Jha over 3 years ago

TI__Guru 50611 points

Johnny,

We have assigned the thread to Flash expert. He is out of office today. Please expect response by next week. Meanwhile, please take a look at this link where Flash expert walks through all the steps needed for boot from flash.

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/878674/faq-flash---how-to-modify-an-application-from-ram-configuration-to-flash-configuration

Also, regarding your question on load, please take a look at this link.

https://software-dl.ti.com/ccs/esd/documents/sdto_cgt_Linker-Command-File-Primer.html#load-at-one-address-run-from-a-different-address

TI.ramfunc : >> FLASH_BANK0_SEC1 | FLASH_BANK0_SEC2 | FLASH_BANK0_SEC3

That means that .TI.ramfunc is split across those memory ranges. Note the >> syntax. If all of.TI.ramfunc does not fit in FLASH_BANK0_SEC1, then it is split, and the rest goes into the remaining memory ranges. The split occurs on input section boundaries. An input section is never split. This means no function, array, structure, etc. can ever be split in the middle. The memory ranges are used in that order.

Regards, Santosh