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How to robustly protect a STM32F4xx against code extraction...

Question asked by poulin.jean_pier.001 on Nov 14, 2014
Latest reply on Nov 14, 2014 by poulin.jean_pier.001
Hello ST gurus!

Our company is seeking to protect its IP as much as possible from code extraction before products are shipped.

We understand the STM32F4xx has protective features to prevent code extraction via JTAG and flash reading / writing in certain modes, but previous attempts have bricked a few boards and we would like to obtain the proper sequence of step to lock the device as securely as possible when product is factory-provisioned, and how to unlock it in our firmware upgrade process.

I could not find an appnote or a code fragment that reveals how to properly do it.  Is there a code sample that someone can share that illustrates the proper procedure?

Many thanks!!

   Jean-Pierre

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