Flash reading, if MCU is read protected

matic · ‎2016-06-09

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

Tesla DeLorean · ‎2016-06-09

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.

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..

matic · ‎2016-06-09

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 · ‎2016-06-10

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.

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..