This page gives an overview of upstream projects. If you miss information or find mistakes, please edit.

Android

Apache NuttX

RISC-V Maintainers


NuttX RTOS has a weaker sense of maintainership than many open-source projects. However, the primary contributors are:

  • Janne Rosberg (Offcode)
  • Masayuki Ishikawa (Sony Corporation)
  • Xiang Xiao (Xiaomi Corporation)

FreeBSD

RISC-V Maintainers

FreeBSD has a weaker sense of maintainership than many open-source projects. However, the primary contributors are:

  • John Baldwin (SRI International)
  • Ruslan Bukin (University of Cambridge)
  • Jessica Clarke (University of Cambridge)
  • Mitchell Horne
  • Kristof Provost

Releases

FreeBSD major releases are approximately every two years, with minor releases every year and interim security patches as needed.

Previous releases:

  • FreeBSD 13.0 (2021-04-13) - RISC-V promoted to being a Tier 2 architecture
  • FreeBSD 12.2 (2020-10-27)
  • FreeBSD 12.1 (2019-11-4)
  • FreeBSD 12.0 (2018-12-11) - RISC-V added as a Tier 3 architecture

RISC-V Status

RV64G is supported for several popular hardware, emulated and FPGA-based platforms as a Tier 2 platform. Various feature additions and performance optimisation opportunities exist. See the upstream wiki page linked above for more details.

FreeRTOS

RISC-V Status

RISC-V support has been merged in FreeRTOS. A couple of boards is directly supported.

Haiku

Haiku has been ported to RISC-V: https://www.haiku-os.org/blog/kallisti5/2021-11-07_booting_our_risc-v_images/

Hubris

There is an initial port of Hubris to the Freedom E310 core on a Sparkfun RED-V board: https://github.com/oxidecomputer/hubris/discussions/365

 Note from Cliff:

> In general, Hubris was originally designed with the intent of moving to RISC-V eventually, which is part of why we're so register-focused in the calling convention.

Illumos

Illumos has been ported to the Allwinner D1: https://github.com/n-hys/illumos-gate/wiki/Allwinner-D1-Nezha

Linux

RISC-V Maintainers

  • Palmer Dabbelt
  • Albert Ou
  • Paul Walmsley

Releases

The Linux kernel has been merged mainline in the 4.15 merge window in November 2017.

Since then a range of Distributions have RISC-V ports. E.g.:

RISC-V Status

The Linux kernel supports RV64G as well as RV32G.

Oberon

There is an Oberon port for RISC-V, e.g., for the Bouffalo Lab BL808: http://oberon.wikidot.com/project-oberon-v

OpenBSD

Releases

RISC-V Status

Work is in progress adding the port, with the first commit made on 23rd April 2021.

Plan 9

Plan 9 ports exist; see also: https://ntnuopen.ntnu.no/ntnu-xmlui/bitstream/handle/11250/2902876/no.ntnu:inspera:74730513:31541262.pdf?sequence=1

xv6

There are multiple RISC-V ports of xv6 (https://pdos.csail.mit.edu/6.828/2022/xv6.html).

Ports

Zephyr

RISC-V Maintainers

  • Karol Gugala (Antmicro)
  • Tomasz Gorochowik (Antmicro)
  • Filip Kokosinski (Antmicro)

Releases

RISC-V support has been present in the Zephyr RTOS since:

  • v1.7.0, for RV32I (March 2017)
  • v2.0.0, for RV64I (September 2019)
  • v3.2.0, for RV32E (September 2022)

RISC-V Status

As of February 2023, dozens of physical (non-emulated) targets are supported in Zephyr.


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