lowRISC C.I.C., together with SCI Semiconductor, announced the release of the open source Sunburst Chip design repository, a key milestone in phase two of the DSbD/UKRI-funded Sunburst Project (Grant Number: 107540). This marks a significant step in bringing CHERIoT-Ibex based secure microcontrollers to market, as leveraged by SCI’s ICENI device family, which will reach first commercial availability this year.
Why it matters: memory safety vulnerabilities account for around 70% of reported exploits, causing industries from automotive to IoT and industrial systems to require secure, efficient microcontroller solutions that balance performance, power consumption, and affordability. CHERI technology provides a critical solution, mitigating these vulnerabilities by enforcing memory safety at the hardware level.
“By addressing security challenges in a �by design’ manner, CHERIoT-Ibex has proven its potential as a next-generation secure microcontroller architecture. However, to move the needle, CHERIoT-based IP must be both commercial-grade and readily available,” said Dr. Gavin Ferris, CEO of lowRISC. “Our release, with SCI, of the permissively licensed open source Sunburst Chip repository is a significant turning point in bringing CHERI-based security to the embedded systems market, and represents a core deliverable of the Sunburst project.”
This news follows lowRISC and SCI Semiconductor’s commitment to tape out the Sonata design (incorporating Microsoft’s Ibex-based CHERIoT core). This builds on the success of the first phase of the Sunburst Project, which introduced CHERI technology to embedded engineers through the Sonata FPGA board and RTL platform. The project was subsequently extended to deliver an open source SoC top-level, reusing much of the IP developed for OpenTitan “Earl Grey”, which itself has reached production with Google and is heading into Chromebooks this year. Sonata platforms distributed to key stakeholders by the Sunburst project are driving awareness, technical engagement and innovation around memory-safe microcontrollers as could be seen in the recent Digital Catapult / DSbD TAP Cohort 6 event.
SCI Semiconductor is leveraging the Sunburst Chip repository as the foundation of their ICENI family of secure microcontrollers. As part of this effort, SCI is targeting a 22nm commercial process and will drive this design to form the basis for the first ICENI secure microcontroller, a commercial chip available in the second half of 2025
“The availability of commercial-grade CHERI technology is a key factor in shaping the future of secure computing,” said Haydn Povey, Chief Executive, SCI Semiconductor. “We are on a mission to ensure that the market has access to robust, open source foundations for secure-by-design microcontrollers enabling a focus on differentiation, just as we have with Iceni.”
The Sunburst Chip repository is now publicly available on GitHub at https://github.com/lowRISC/sunburst-chip. Developers and researchers are encouraged to explore the repository and leverage the technology for their own CHERIoT-Ibex based designs.
