Trusty is a a set of software components, supporting a Trusted Execution Environment (TEE) on mobile devices, published and maintained by Google.
Detailed information and build instructions can be found on the Android Open Source Project (AOSP) webpage for Trusty hosted at https://source.android.com/security/trusty
Out of all the platforms supported by the ARM Trusted Firmware, Trusty is verified and supported by NVIDIA's Tegra SoCs.