AnsweredAssumed Answered

Kinetis Security - Backdoor usage - Please explain

Question asked by joe hinkle on Nov 28, 2016
Latest reply on Nov 28, 2016 by Hui_Ma

I currently have a K64 which uses a bootloader and Application.


The K64 has security enabled but allows bulk erase and NXP access.


In another post, I noted a glitch in the VCC line has caused the App to hardfault and NOT recover after a reset or power cycle.


My only recourse, as I see it is to bulk erase, reflash with a debugger, and hope it faults again so I can understand what issue the VCC glitch caused.


Moving forward, I would like to be able to debug the faulted application - even with security set.


I understand that my app, prior to faulting, can use the backdoor key and release security temporarily.  If I do this, will I be able to attach a debugger to the target (jlink + Crossworks) and step thru the application or break when the hardfault occurs?