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How do I disable JTAG on i.MX21 for security reasons?

Question asked by Chris Darrow on Sep 9, 2016
Latest reply on Sep 20, 2016 by Artur Petukhov

I received a question from a customer about turning off JTAG on the MC9328MX1 processor for security reasons. They do not want anyone "back dooring" into their system. I know the newer processors give you the ability to disable JTAG, for this very reason. But I did not see anything for the MC9328MX1. Do you know if there is any method to disable the JTAG port? If not, is there another way (HW or SW) that you are aware of that would provide this functionality?


My customer already has their system in production, and therefore, they cannot consider a newer processor for the current platform. They need to solve this problem on their i.MX21 based platform.