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ACRN Project Releases Version 1.1

By June 27, 2019April 24th, 2020Blog

We are pleased to announce the release of ACRN™ Hypervisor version 1.1 which introduces Hybrid Mode and support for Zephyr, VxWorks and Windows as new Guest Operating Systems.

In this reference release, we use Clear Linux* as the Service OS (SOS) and User OS (UOS).  Android* and other Linux* based OSes can also be used as a UOS.

See the full release notes and latest documentation for more information about this 1.1 release.

Key features for this 1.1 release include:

Hybrid Mode Introduced

In hybrid mode, the hypervisor launches the Zephyr OS even before the Service OS is launched (pre-launched), with dedicated resources to achieve the highest level of isolation. This is designed to meet the needs of a Functional Safety (FuSa) certifiable safety OS.

Support for new guest Operating Systems

  • The Zephyr RTOS can be a pre-launched Safety OS in hybrid mode. It can also be a post-launched (launched by Service OS, not the hypervisor) as a guest OS.
  • VxWorks as a post-launched RTOS for industrial usages.
  • Windows as a post-launched OS

Document updates

We have many reference documents available, including:

Refer to the ACRN version 1.1 release notes for more details.

About the ACRN™ Project

ACRN is a flexible, lightweight reference hypervisor, built with real-time and safety-criticality in mind, optimized to streamline embedded development through an open source platform. To learn more, please visit

About the Linux Foundation

Founded in 2000, the Linux Foundation is supported by more than 1,000 members and is the world’s leading home for collaboration on open source software, open standards, open data, and open hardware. Linux Foundation’s projects are critical to the world’s infrastructure including Linux, Kubernetes, Node.js, and more.  The Linux Foundation’s methodology focuses on leveraging best practices and addressing the needs of contributors, users and solution providers to create sustainable models for open collaboration. For more information, please visit us at