June 21-24, 2022
Austin, Texas, USA + Virtual
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Note: The schedule is subject to change.

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Thursday, June 23 • 12:00pm - 12:40pm
System Device Tree and Lopper: Concrete Examples - Bruce Ashfield & Stefano Stabellini, AMD

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System Device Tree is an extension to Device Tree to describe all the hardware on an SoC, including heterogeneous CPU clusters and secure resources not typically visible to an Operating System like Linux. This full view allows the System Device Tree to be the "One true source" of the entire hardware description and helps to prevent the common (and hard-to-debug) problem of conflicting resources and system consistency. Lopper is an Open Source framework to parse and manipulate System Device Tree. With Lopper, it is possible to generate multiple traditional Device Trees from a single larger System Device Tree. This presentation will provide an overview of System Device Tree and will discuss the latest updates of the specification and tooling. The talk will illustrate multiple use-cases for System Device Tree with concrete examples, such as Linux running on the more powerful CPU cluster and Zephyr running on a smaller Cortex-R cluster. It will also show how to use Lopper to generate multiple traditional Device Trees targeting different OSes, not just Linux but also Zephyr/other RTOSes. Finally, an end-to-end demo based on Yocto to build a complete heterogeneous system with multiple OSes and RTOSes running on different clusters on a single reference board will be shown.

avatar for Bruce Ashfield

Bruce Ashfield

Principal Software Engineer, AMD
Bruce has been working professionally with Linux since 2000, and a user since 1995. He currently works as a Principal Systems Engineer for AMD, sending time as maintainer for the Yocto project reference kernel, meta-virtualization and meta-cloud-services layers. He is also the creator... Read More →
avatar for Stefano Stabellini

Stefano Stabellini

Fellow, AMD
Stefano Stabellini is a Fellow at AMD, where he leads system software architecture and the virtualization team. Previously, at Aporeto, he created a virtualization-based security solution for containers and authored several security articles. Stefano has been involved in Xen development... Read More →

Thursday June 23, 2022 12:00pm - 12:40pm CDT
Room 203/204 (Level 2)