System Device Tree is an ongoing effort to expand the scope of Device Tree to describe and configure modern heterogeneous SoCs, including multiple CPUs clusters, their views of the system, and the software running on them. System Device Tree comes with Lopper, an Open Source Python tool to read a System Device Tree and produce one traditional Device Tree for each software execution domain. The System Device Tree specification progressed significantly in the last year. This presentation will provide an update on the latest developments, such as the new bindings for the description and configuration of bus firewalls. The talk will deep-dive into Lopper, its flexible plugins architecture, and explain how to use it with System Device Tree today. If time allows, some common System Device Tree and Lopper use cases will be demonstrated.