4.5. [Optional] Implementing TrustZone to provide a robust security solution

In ARMv7-A, there are many possible software architectures that a Secure state software stack on a TrustZone-enabled processor core can implement. The most complex is a dedicated Secure state operating system; the simplest is a synchronous library of code placed in a Secure state. There are many intermediate options between these two extremes.

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