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• RISC-V Android port home page (GitHub)

Apache NuttX

• NuttX Homepage
• NuttX Source Code (GitHub)

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

• FreeBSD Homepage
• Upstream wiki page

RISC-V Maintainers

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

...

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

...

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

• Debian
• Fedora
• openSUSE
• Canonical Ubuntu
• Buildroot
• Yocto
• Arch Linux (Install on Unmatched)
• Gentoo Linux
• openEuler
• AOSP for RISC-V 10, AOSP 12 rebasing effort main repos , PLCT wip repos

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

• Generic: https://github.com/mit-pdos/xv6-riscv
• Book: https://github.com/mit-pdos/xv6-riscv-book

Ports

• iCE40 FPGA https://gitlab.com/x653/xv6-riscv-fpga
• Allwinner D1: https://github.com/michaelengel/xv6-d1

Zephyr

Zephyr has supported RISC-V since v1.7.0.

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• JH7110 (VisionFive 2): https://github.com/michaelengel/xv6-vf2

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.

• List of RISC-V Boards: https://docs.zephyrproject.org/latest/boards/riscv/index.html
• Zephyr release notes: https://docs.zephyrproject.org/latest/releases/index.html