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Life & fun · January 10, 2026

Porting xv6 to HiFive Unmatched board

Hi HN, I ported the teaching OS xv6-riscv to HiFive Unmatched and got it running on real hardware, including passing usertests. I've been self-studying OS internals using the MIT 6.1810 materials. After finishing most of the labs, I was eager to see what it's like to run the OS on bare metal, rather than QEMU. The Unmatched may not have the latest RISC-V features, but it's well-documented, and the Rev B release has made it more affordable, which makes it a good learning platform. The porting process involved several interesting challenges: - Hardware Quirks: Handling things like enabling…

Porting xv6 to HiFive Unmatched board launched on January 10, 2026 with 26 votes, #663 of 14,584 launches that month and more than 95% of that year's launches.

Visit github.com ↗Alternativestop 5% of January 2026

In plain words

This project demonstrates a successful port of xv6-riscv, an educational operating system, to the HiFive Unmatched RISC-V board, running on actual hardware rather than emulation. Created by a self-taught OS developer working through MIT 6.1810 coursework, the port addresses real hardware challenges including interrupt handling, memory management quirks, and boot flow compatibility. It is for students and hobbyists learning operating system internals who want to run teaching OS code on actual RISC-V hardware. The work stands out for bridging the gap between theoretical OS concepts and practical bare-metal implementation.

written from the facts on this page · September 2026

From the sources

A port of xv6-riscv to the SiFive HiFive Unmatched board. - eyengin/xv6-riscv-unmatched

This is a port of xv6-riscv to the SiFive HiFive Unmatched board (FU740). See notes for the implementation details. git clone https://github.com/eyengin/xv6-riscv-unmatched cd xv6-riscv-unmatched make unmatched The unmatched target automatically converts the kernel ELF to a raw binary and packages it into a FIT image ( xv6-unmatched.itb ) using mkimage . This image includes the necessary metadata for U-Boot SPL to recognize it as a bootable firmware. This port uses U-Boot SPL to load the xv6 kernel directly (replacing OpenSBI in the standard flow). Clone and build v2023.01 (Note: newer versions failed to initialize CPU clocks correctly in the SPL phase): git clone…from github.com

In the maker’s words, at launch

Hi HN, I ported the teaching OS xv6-riscv to HiFive Unmatched and got it running on real hardware, including passing usertests. I've been self-studying OS internals using the MIT 6.1810 materials. After finishing most of the labs, I was eager to see what it's like to run the OS on bare metal, rather than QEMU. The…

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