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TMS570 - MPU for Flash Bank 1

Piotr Roszak
Intellectual 530 points
Other Parts Discussed in Thread: TMS570LC4357

Hello,

I'm trying to use MPU on TMS570LC4357 for protection of Flash Bank 1.
Even though I enabled MPU and set Flash Bank1 as read-only region (no region after refers to memory of Flash Bank 1), I did not notice any data abort or interrupt caused by write to Flash Bank1. Writing to Flash Bank1 is performed using Fapi.

Is there something I miss?

Thanks for help,
Piotr

  • 0
    TI__Mastermind 22375 points

    Piotr,


    When the Flash API is used to program (write) to the flash, the CPU does not directly write to the Flash address.
    The physical write to the flash is performed by the Flash State Machine in the flash wrapper.

    That the reason why the MPU cannot detect and block this write access.

    In the flash configuration, there is way to protect sector or even bank to be erase or programmed.
    If a sector or bank is accessed for program or erase, the flash API will return an error, and your application will have to take care of it.

    Please let me know if I've answered your question.

  • 0 in reply to Jean-Marc Mifsud
    Intellectual 530 points
    Thank you for reply. It answers my question.