Arm's TrustZone technology, available on Arm application processors for many years, was released for microcontroller cores a few years ago and is now becoming common in the leading microcontroller vendor product lines. While TrustZone provides some very valuable and relatively simple technologies for securing embedded systems, once enabled, it can be significantly difficult to set up and manage. This talk will focus on what TrustZone is, and how IAR's security add-on tools can enable a secure boot based system using TrustZone to be implemented simply while utilizing all of the features afforded by the new technology.