RISC-V International
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NuttX RTOS has a weaker sense of maintainership than many open-source projects. However, the primary contributors are:
FreeBSD has a weaker sense of maintainership than many open-source projects. However, the primary contributors are:
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Haiku has been ported to RISC-V: https://www.haiku-os.org/blog/kallisti5/2021-11-07_booting_our_risc-v_images/
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 has been ported to the Allwinner D1: https://github.com/n-hys/illumos-gate/wiki/Allwinner-D1-Nezha
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Since then a range of Distributions have RISC-V ports. E.g.:
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There are multiple RISC-V ports of xv6, including one for the xv6 (https://pdos.csail.mit.edu/6.828/2022/xv6.html).
RISC-V support has been present in the Zephyr RTOS since:
As of February 2023, dozens of physical (non-emulated) targets are supported in Zephyr.