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matic
matic
Associate III
June 9, 2016
Question

Flash reading, if MCU is read protected

  • June 9, 2016
  • 3 replies
  • 931 views
Posted on June 09, 2016 at 22:16

Hi.

When read protection level 1 is applied to MCU, is it possible to read flash content somehow?

I would like to store CPU status register, PC and some other variables into flash in case of hard fault. But MCU was read protected with level 1 before. If I get such (defected) part back, is it possible to read those statuses and variables from flash? I would have one dedicated flash page only for that.

Or is it maybe possible to leave only that page unprotected?

Thanks
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    3 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    June 9, 2016
    Posted on June 09, 2016 at 22:21

    It is a binary option, and only your own code running in Flash can read the content. You will have to code your own methods to exfiltrate the data you have stored there.

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    matic
    maticAuthor
    Associate III
    June 10, 2016
    Posted on June 10, 2016 at 06:05

    So, it is not possible to read that page, if I connect the part to the debug port? Am I correct?

    Tesla DeLorean
    Tesla DeLorean
    Guru
    June 10, 2016
    Posted on June 10, 2016 at 18:30

    I think I've been pretty clear, if you feel the need to validate what I'm saying you should experiment and draw your own conclusions.

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