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lowRISC C.I.C. is a not-for-profit company headquartered in Cambridge, UK. It uses collaborative engineering to develop and maintain open source silicon designs and tools.cite-ref-lowrisc-about-1-0[1] lowRISC is active in RISC-V-related open source hardware and software development and stewards the OpenTitan project.

• Projects

• OpenTitan

• Ibex CPU core

• Prototype 64-bit SoC design

• Other projects

• Governance

• History

• References

• External links

OpenTitan is the first open source silicon Root of Trust (RoT) project.cite-ref-2[2] It is designed to be integrated into data center servers, storage devices, peripherals and other hardware.cite-ref-3[3] OpenTitan is under the stewardship of lowRISC and collaboratively developed by Google, ETH Zurich, Nuvoton, G+D Mobile Security, Seagate, and Western Digital.cite-ref-4[4] The OpenTitan source code is available on GitHub, released under the permissive Apache 2 license.

Ibex is an embedded open source 32-bit in-order RISC-V CPU core, which has been taped out multiple times.cite-ref-5[5] Ibex is used in the OpenTitan chip. Development on Ibex started in 2015 under the name "Zero-riscy" and "Micro-riscy" at the ETH Zurich and University of Bologna, where it was part of the PULP platform. In December 2018 lowRISC took over the development.cite-ref-6[6] Luca Benini of the ETH Zurich sits on lowRISC' board.

The lowRISC prototype 64-bit SoC design is an open source Linux-capable 64-bit RISC-V SoC design. A first version preview release of the source code was made available in April 2015.cite-ref-7[7] Since then features were added, such as support for tagged memory and "minion cores", small CPU cores which are dedicated to I/O tasks.cite-ref-8[8] The latest version 0.6 was released in November 2018,cite-ref-9[9] and is available to download and try out on an FPGA.

lowRISC initiated and led the upstreaming of the RISC-V LLVM backend, where Alex Bradbury is code owner.cite-ref-10[10]

lowRISC's governance and current appointed directors are set out in its entry at the UK Companies House.cite-ref-11[11]

lowRISC was spun out of the University of Cambridge Computer Lab in 2014 by Alex Bradbury, Robert Mullins, and Gavin Ferriscite-ref-lowrisc-about-1-1[1] with the goal of creating a fully open source SoC and low-cost development board.cite-ref-12[12]cite-ref-13[13]

In 2015 lowRISC became one of the founding members of the RISC-V Foundation (today: RISC-V International).cite-ref-14[14]

Since 2018 lowRISC has been focusing on collaborative engineering with partner organizations. In 2019 the OpenTitan project, stewarded by lowRISC, was announced.cite-ref-15[15]

cite-note-lowrisc-about-11. ↑ "About lowRISC". lowrisc.org. Retrieved 24 March 2021.

cite-note-22. ↑ citerefanderson2019Anderson, Tim (5 Nov 2019). "Cambridge boffins and Google unveil open-source OpenTitan chip – because you never know who you can trust". The Register. Retrieved 24 March 2021.

cite-note-33. ↑ "Open source silicon Root of Trust". opentitan.org.

cite-note-44. ↑ "OpenTitan partners". opentitan.org. Retrieved 24 March 2021.

cite-note-55. ↑ "Ibex: An embedded 32 bit RISC-V CPU core". Retrieved 24 March 2021.

cite-note-66. ↑ "Ibex Reference Guide: History". Retrieved 24 March 2021.

cite-note-77. ↑ "lowRISC tagged memory preview release". lowrisc.org. April 13, 2015. Retrieved 24 March 2021.

cite-note-88. ↑ "Overview of the minion infrastructure". lowrisc.org. Retrieved 24 March 2021.

cite-note-99. ↑ "lowRISC 0-6 milestone release". lowrisc.org. 2018-11-12. Retrieved 24 March 2021.

cite-note-1010. ↑ citerefbradburyBradbury, Alex. "The RISC-V LLVM backend in Clang/LLVM 9.0". lowrisc.org. Retrieved 24 March 2021.

cite-note-1111. ↑ lowRISC entry on the Companies House website

cite-note-1212. ↑ "Free Core, Some Assembly Required". EETimes. 2016-01-07. Retrieved 24 March 2021.

cite-note-1313. ↑ "LowRISC SoC - 1st RISC-V Workshop". YouTube.

cite-note-1414. ↑ "Founding Members". riscv.org. Retrieved 24 March 2021.

cite-note-1515. ↑ citerefbradbury2019Bradbury, Alex (2019-11-05). "Announcing OpenTitan, the First Transparent Silicon Root of Trust".

• Official website