After a decade of relentless refinement, what has Zyphry done right?
Ten years ago, a group of engineers from companies such as Intel, Wind River, NXP, and Synopsys introduced Zephyr RTOS at the Embedded World Conference. It is a minimalist, open - source, portable, and secure real - time operating system (RTOS). At that time, its kernel was only 8KB–512KB in size, capable of running on hardware with extremely limited resources, and was designed with open governance and built - in security practices as its tenets. Today, Zephyr has evolved into a global production - level platform covering the Internet of Things (IoT) from simple sensors to complex industrial systems, with an audience spanning various fields such as consumer electronics, industrial control, and healthcare.
Zephyr has emphasized openness and flexibility from the very beginning: It is governed by the Linux Foundation, with open source code and vendor neutrality, encouraging manufacturers and the community to jointly build an ecosystem. Compared with closed proprietary RTOS, Zephyr allows developers to freely choose hardware platforms and reuse the same set of code across multiple architectures; this significantly reduces duplicate work and development costs between different product lines.
As an open - source real - time operating system, Zyphyr has evolved from a small experimental project into a core platform in the embedded industry in just ten years. Its success can be attributed to multiple aspects, including open and neutral community governance, a rich ecosystem, cross - architecture hardware support, and the design for security and maintainability. Semiconductor manufacturers such as NXP, Silicon Labs, and STMicroelectronics have strengthened this ecosystem by providing hardware support, open - source drivers, and development tools.
Background and Origin
The Zephyr project made its debut at the Embedded World Conference in Nuremberg, Germany, in 2016. The project's predecessor was WindRiver's Rocket RTOS (a derivative of Virtuoso), which was transformed into an open - source project hosted by the Linux Foundation in 2016 and renamed Zephyr. Companies such as Intel, NXP, and Synopsys participated in the project launch as founding members, with the goal of building a "small and refined" RTOS with a kernel occupancy of 8KB–512KB, a portable architecture, and an emphasis on security and open - source governance from the start. Through the governance structure of the Linux Foundation, Zephyr maintains vendor neutrality and open - source transparency, avoiding monopolies and lock - ins, allowing any manufacturer and developer to participate and contribute code.
On this basis, Zephyr has gradually expanded from its initial streamlined kernel and limited device support to a complete platform: It has introduced modern scheduling and kernel services, file systems, logging, encryption, secure boot, wireless protocol stacks, device management frameworks, and other functions. As of the end of 2024, Zephyr supports more than 750 boards, covering eight major architectures such as ARM and RISC - V and hundreds of sensors. Behind this growth is the continuous investment of more than a thousand contributors globally, with over 100,000 commits in 2024 and a cumulative support for more than 750 boards.
Key Success Factors
The success of Zephyr is inevitable, and the most important factor is the strong support of ecological partners.
Open and Neutral Governance Model: Under the management of the Linux Foundation, Zephyr maintains vendor neutrality. All contributors (including Intel, NXP, Silicon Labs, ST, ARM, etc.) advance the project under common governance. This model avoids the lock - in effect of a single vendor, allowing developers to freely choose hardware manufacturers without worrying about software compatibility. The motivation for early investment by founding members such as NXP was to break the fragmented pattern, build a unified foundation, and jointly invest in network, security, and driver development.
Ecosystem and Community Maturity: Zephyr has an active community and rich ecological resources. The number of global open - source contributors increases annually. In 2024, there were more than 1,100 contributors, with more than half being first - time contributors. Community activities are lively, with multiple technical sharing sessions, seminars, and global city meet - ups held annually. Many manufacturers have established cooperation organizations and held training sessions, greatly reducing the learning threshold for beginners. A survey in the official Zephyr white paper also shows that ecosystem maturity is the primary factor for developers when choosing an RTOS. Today, Zephyr has more than 900 supported boards (covering MCUs and SoCs) and 275 types of sensor support, as well as hundreds of middleware and protocol modules, forming a complete platform that provides "out - of - the - box" solutions for device developers.
Hardware Portability and Multi - Architecture Support: From its design, Zephyr supports multiple processor architectures (ARM, RISC - V, ARC, Tensilica, x86, etc.). This multi - architecture support allows products to reuse code across chip families, significantly reducing development costs when switching hardware. An industry survey shows that 49% of Zephyr users list "hardware portability" as the primary advantage. In practice, when a chip is discontinued or a project is expanded, developers only need to update the device tree configuration to quickly port, avoiding the high cost of "starting from scratch." At the same time, Zephyr's modular design and modern toolchains such as the West build tool further enhance the efficiency of code reuse and cross - platform development.
Security and Compliance Design: Security has always been the core focus of Zephyr. A security committee was established early in the project, and security coding standards and vulnerability response processes were introduced. Since becoming a CVE numbering authority in 2017, obtaining the Linux Foundation Core Infrastructure Gold Award in 2018, and continuously using automated SBOM tools, Zephyr has continuously improved in terms of security transparency and response speed. Today, Zephyr has a dedicated Product Security Incident Response Team (PSIRT) and collaborates with the community to quickly fix vulnerabilities, meeting strict industry requirements. In 2024, the project received recognition for the IEC 61508 functional safety concept and is advancing certification work including quality management processes, which means that Zephyr is expanding into safety - critical environments (such as industrial and automotive).
Complete Middleware and Connectivity: Zephyr integrates rich network and peripheral support, including IPv4/IPv6, CoAP, MQTT, Bluetooth LE, 802.15.4/Zigbee, Thread, Wi - Fi and other protocol stacks; as well as various file systems, device firmware update (DFU) mechanisms, etc. These pre - integrated functions reduce the workload for users to port protocol stacks themselves, significantly shortening the product development cycle. In addition, manufacturers and the community continuously contribute sensor drivers, communication drivers, and artificial intelligence support libraries (such as synthetic data generation, TinyML toolchains, etc.), enabling Zephyr to have strong application potential in edge computing, IoT, and AIoT scenarios.
Long - Term Support and Maintenance: Zephyr's version management emphasizes LTS (Long - Term Support) releases. Version 3.7 (released in 2024) is positioned as an LTS, promising 2.5 years of security and stability maintenance. This strategy provides a reliable foundation for product developers, ensuring that security updates do not interrupt the system. The community's technical roadmap also focuses on maintainability in the long term, for example, gradually introducing static analysis, MISRA standards, and a comprehensive CI testing process, aiming to reduce the maintenance cost that increases over time.
In summary, open cooperation and multi - party contributions have made the Zephyr platform increasingly mature: Today, it is not only an RTOS kernel but also a complete ecosystem. Successful examples of Zephyr are widespread in various fields from wearables and smart homes to industrial automation, demonstrating its maturity and scalability. However, Zephyr in the open - source model still faces challenges such as a steep learning curve, high long - term maintenance and certification costs, and requires continuous improvement of the toolchain and training support.
Strong Support from Chip Manufacturers
The success of Zyphyr cannot be achieved without the strong support of underlying chip manufacturers. The world's top - ranked MCU manufacturers spare no effort to support Zyphyr.
NXP
As one of the founding platinum members of Zephyr, NXP has been actively involved since the project's inception. NXP values Zephyr's open - source neutrality and cross - product portfolio scalability and provides Zephyr support on multiple MCU/MPU platforms. NXP has submitted a large number of drivers and examples for chip series such as Kinetis, LPC, i.MX, and edge processors. To promote ecosystem development, NXP has released customized getting - started guides and templates to support its mainstream evaluation boards (such as the FRDM development board series) to quickly start Zephyr. NXP's MCUXpresso IDE also provides Zephyr example projects. In addition, NXP has organized training seminars for universities and enterprises in recent years and has encouraged developers to try Zephyr by giving away thousands of FRDM boards. Its official blog states that NXP hopes to reduce fragmentation through Zephyr and build security and connectivity capabilities on a unified foundation, enabling multiple companies to jointly build a stronger ecosystem.
Silicon Labs
Silicon Labs joined the Zephyr community in 2021 (upgraded to a platinum member in 2025). As a leader in the wireless connectivity field, Silicon Labs has introduced support for its series of wireless chips (such as EFR32 Bluetooth/Wi - Fi/Thread chips) to Zephyr. The company has submitted relevant drivers and network protocol stacks to the Zephyr upstream and is responsible for maintaining wireless protocols such as Wi - SUN, Zigbee, and Bluetooth. In early 2026, Silicon Labs launched the Simplicity SDK based on Zephyr, which provides developers with vendor - verified wireless stacks and drivers and guarantees long - life - cycle support. Silicon Labs emphasizes maintaining consistency between the upstream Zephyr and its downstream SDK to balance open - source innovation and commercial - grade reliability. In addition, Silicon Labs is also very active in community activities: Its technical leader served as the chairman of the Zephyr Council in 2026 and jointly organized technical exchange meetings with other members. Silicon Labs also publishes adaptation examples through GitHub (zephyr - silabs repository), promoting the developer ecosystem. Its efforts have made Zephyr's applications in the IoT wireless field more diverse and provided a stable foundation for projects such as Zigbee smart homes.
STMicroelectronics
STMicroelectronics became a silver member of the Zephyr community in 2024. ST's contributions are mainly focused on the STM32 series of MCUs and related peripheral drivers. ST engineers have long contributed code to the Zephyr project, including support for hardware such as USB controllers, LCD - TFT displays, network cards, and low - power modes. They have also invested a lot of effort in reviewing external contributions to ensure that third - party improvement code for the STM32 platform is timely verified and integrated. The latest Zephyr 4.4.0 version adds support for MCU series such as STM32C5, STM32H5, STM32U3, and STM32WBA2X. In practical cases, ST combines Zephyr with its STM32Cube ecosystem, providing rich examples, documentation, and hardware platforms. ST suggests in its blog that developers can quickly get started through the Zephyr documentation page and the Discord community (such as the #STM32 channel). At the community level, ST also actively promotes Zephyr through partner projects, training, and open - source forums and demonstrates the operation of touch screens, sensor drivers, etc. on Zephyr through demonstration projects. ST's continuous participation further ensures the industry's confidence in the usability of Zephyr in professional fields (such as industrial control and the IoT).
ADI
The CodeFusion Studio 2.0 released by ADI in 2025 now supports a complete AI workflow. Developers can bring their own models and efficiently deploy them to ADI's processors and microcontrollers, covering low - power edge devices to high - performance DSPs (Digital Signal Processors). The latest platform is based on Microsoft's Visual Studio Code and has a built - in model compatibility checker, performance analysis tools, and optimization functions to ensure robust and reliable deployment while shortening the product time - to - market.
The new modular framework based on Zephyr supports runtime performance profiling of AI/ML workloads, enabling layer - by - layer analysis and seamless integration with ADI's heterogeneous platforms. Packaging the toolchain into one not only simplifies machine - learning deployment but also enhances system - level performance insights.
Texas Instruments
TI is also one of the Silver members of Zephyr and has long contributed upstream code to Zephyr. TI's official website states that since the establishment of Zephyr in 2016, the TI team has been actively involved in project development and uses Zephyr's Twister and Ztest frameworks to ensure the quality of its products. TI also maintains downstream Zephyr repositories for wireless, MCU, and real - time control, allowing developers to experience the latest features in advance. In addition, TI has invested in developing special VS Code plugins, debugging tools, etc. to enhance Zephyr's support on its chips.
Renesas
In June 2025, Renesas announced an upgrade of its membership level to platinum. Aish Dubey, an executive at Renesas, said that the company is committed to making "OSS - based RTOS solutions widely used in various industries" and will closely cooperate with Zephyr's leadership to accelerate the meeting of increasingly strict functional safety and cybersecurity requirements. Previously, Renesas had multiple microcontrollers (such as the RX and RA series) supported by Zephyr. The new upgrade indicates that it will continue to increase investment and expand Zephyr's influence in the IoT and high - performance fields.
Nordic Semiconductor
Zephyr is a core component of Nordic's nRF Connect SDK. In September 2025, Nordic introduced the integration of the new - generation Wi - Fi SoC (nRF70 series) with Zephyr: Through the Zephyr RTOS, this solution achieves low - power Wi - Fi 6 functionality and provides cloud - ready capabilities for third - party MCUs.
Challenges of Zyphyr
Challenges and risks: Although the Zephyr ecosystem is becoming increasingly powerful, challenges still exist.
First, the learning curve is relatively steep. Zephyr's modern development processes (such as Devicetree, CMake, West, Kconfig) are unfamiliar to engineers with a background in traditional RTOS or bare - metal development. 20% of surveyed users reported limited progress in training and getting started. This leads to the need for additional training investment when expanding the team.
Second, long - term maintenance and certification costs cannot be ignored. Although Zephyr is advancing certification for security standards such as IEC 61508, a large amount of manpower is still required to fully meet industrial and automotive - grade compliance requirements.
Third, risks in competition and ecosystem governance also need to be vigilant: Other RTOS (such as FreeRTOS) have experienced changes by large companies such as Amazon and Microsoft, indicating that the vertical model may bring instability. However, because of Zephyr's community - driven model, it has gradually become the de - facto standard in the industry.
Finally, regulations (such as the EU Cybersecurity Act CRA) have put forward higher requirements for IoT security, requiring Zephyr to be more standardized in vulnerability reporting and strengthen the security of dependent components.
Overall, the ten - year history of the Zephyr project has proven the power of open - source collaboration: Multi - party participation has transformed a lightweight RTOS into a global platform with the efforts of thousands of engineers. Driven by many chip and software development manufacturers, Zephyr is continuously expanding its territory in the IoT and edge computing fields. However, no technological path is smooth. As device complexity increases and regulatory requirements grow, the Zephyr community and ecological partners need to continuously innovate and improve.
However, in any case, in this decade, Zyphyr's ecosystem has done the right thing and succeeded.
This article is from the WeChat official account "EEworld" (ID: EEworldbbs), author: Ji Kai, published by 36Kr with authorization.