Synopsys Silver Now Supports Virtualization of POSIX-style ECUs for Deterministic Software-in-the-Loop Simulations

Synopsys announced the availability of Silver with support for POSIX-style stacks, a significant new capability in Synopsys Silver – Synopsys’ software‑in‑the‑loop environment that allows teams to create and simulate virtual ECUs¹ so they can validate automotive software early and continuously. With this release, development and test teams can virtualize POSIX‑style ECUs and validate POSIX-style applications and middleware inside realistic system scenarios, side by side with existing virtual ECUs.

The automotive industry is rapidly moving toward software‑defined vehicles and centralized E/E architectures, where domain‑ and vehicle‑central compute units replace traditional distributed ECU networks. These new architectures demand rich, POSIX‑style operating systems capable of handling modern development methodologies, high software complexity, and advanced middleware such as AUTOSAR Adaptive and Eclipse S-CORE².

At the same time, OEMs and suppliers face intense pressure to shift validation earlier, reduce dependency on hardware-in-the-loop setups, shorten integration cycles, and move large portions of testing into scalable, cloud‑based simulation environments. Ensuring correctness and performance across heterogeneous software stacks requires simulation environments that are fast, deterministic, and realistic enough to replace physical setups.

As a result, there is a growing market need for high‑performance POSIX-style simulation that fits seamlessly into existing virtual ECU environments and supports the deep integration testing required by modern centralized architectures.

Until now, teams working with a combination of AUTOSAR Classic, POSIX-styled stacks, and other middleware often had to rely on fragmented tool chains which are error-prone and have high maintenance efforts or compromise on determinism and synchronization.

With Silver, development and test teams can now simulate AUTOSAR Classic and POSIX-style stacks together in one unified, deterministic environment.

This new capability provides:

• Time- and data-deterministic execution across heterogeneous virtual ECUs
• Tightly synchronized co-simulation between virtualized POSIX-style ECUs, AUTOSAR Classic virtual ECUs, plant models and virtual buses.
• Realistic system-level testing without requiring hypervisors, admin privileges, or detailed hardware emulation.
• End-to-end validation of service discovery, inter-ECU communication, middleware interactions, and application behavior.
• A single environment that mirrors upcoming centralized compute architectures while maintaining the speed, reproducibility, and developer friendly workflows Silver users expect.

This unified AUTOSAR Classic + POSIX simulation unlocks deeper validation, accelerates integration, and makes it possible to test large, multi-OS ECU systems entirely in software – deterministically and at scale.

Silver delivers robust virtualization capabilities through several key features, including:

• Deterministic: At its core, Silver delivers time‑ and data‑deterministic execution so that co‑simulation with other Silver virtual ECUs or third‑party tools stays synchronized and reproducible. The POSIX-style software under test runs in a sandbox, isolating the simulation from host artifacts like time, scheduling, network & environment settings, permissions, and file system structures.
• Fast: Virtual ECUs operate as standard user programs, focusing solely on POSIX-style application and middleware validation without requiring a full-fledged virtual machine or system emulator like QEMU, which introduces additional overhead.
• High-Performance: By leveraging a simulation-optimized approach and eliminating detailed hardware emulation, the solution achieves faster boot times and enables simulations to run in real-time or faster-than-real-time, significantly accelerating test cycles. Additionally, AI and ML applications are accelerated by utilizing the host GPU, further enhancing performance for compute-intensive workloads.
• Interoperable: Integration feels native: users interact with the virtualized POSIX-style ECU like any other Silver component and can use familiar Silver features such as widgets for visualization and control. Users stay in their host development environment throughout since no target tool chain is required for debugging and virtual ECUs can be exchanged as self‑contained packages without the fear of GPL restrictions.
• Non-intrusive: Crucially, when it comes to virtualization, the solution remains non‑intrusive for corporate IT: it requires no admin privileges, no hypervisor installations, no host kernel changes, and no virtual hardware setup – so it runs seamlessly on standard host machines and cloud environments.

In an early customer engagement, MICROSAR stacks from Vector Informatik GmbH³ were successfully virtualized in Silver and co-simulated alongside other virtual ECUs using SIL Kit⁴ (see Figure 1). The Silver environment combined AUTOSAR Classic and Adaptive components, exercised service discovery, and data exchange, and delivered repeatable system‑level tests on a developer workstation – without special IT permissions or target toolchains. The team highlighted how determinism and speed shortened their integration loops while keeping workflows comfortably within their standard Silver environment.

Vector, Synopsys’ partner for the collaborative development of SIL Kit emphasizes the value of Silver’s new capabilities:

“I consider Silver's virtualization support for POSIX-style stacks, a key enabler for efficient, fully reproducible, virtual time simulations of AUTOSAR adaptive platform. Thanks to SIL Kit, our customers can mix and match tools of their choice, creating time-synchronized co-simulations of systems, including classic vECUs and other models.”, said Christian Köllner, Vice President SIL and Virtualization Tools, Vector Informatik GmbH.

Silver with virtualization support for POSIX-style stacks is available from today with the latest Silver product release. Looking ahead, Synopsys plans to expand Rust support for upcoming POSIX-styled stacks, including Eclipse S-CORE and its production-ready counterpart Qorix Performance⁵. Regarding the latter, Synopsys is already working successfully with Qorix. Caroline Pastjan, Head of Revenue, Qorix GmbH states:

“Qorix and Synopsys are collaborating to integrate Qorix Adaptive and Qorix Performance with Silver, delivering unique virtualization capabilities that empower customers to develop and validate their applications on Qorix stacks. We’re excited to share much more in 2026.”

If you are building ECUs and planning POSIX-style deployments, Silver provides a deterministic, fast, interoperable, and non‑intrusive path to virtualize and validate your software at scale.

[1] Synopsys. “Accelerating Development of Software Defined Vehicles with Virtual ECUs”

[2] Eclipse. “Eclipse S-CORE"

[3] Vector. “MICROSAR Adaptive: Embedded Software for High-Performance Computing”

[4] Vector and Synopsys. “Your Open-Source Library for Connecting SIL Environments”

[5] Qorix. “Smart Performance: Scalable Solutions for Next-Generation Vehicle Software”