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The x86 version of xv6 is no longer updated, the last updates took place about 7 years ago. Current xv6 supports RISC V in qemu, there are also ports to real RISC V devices (Kendryte/Canaan K210 by Huazhong University of Science and Technology, Allwinner D1 and StarFive JH7110 by me) and FPGA implementations (by Michael Schröder).

https://github.com/mit-pdos/xv6-riscv/ (qemu)

https://github.com/HUST-OS/xv6-k210 (K210)

https://github.com/michaelengel/xv6-d1 (Allwinner D1)

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

https://gitlab.com/x653/xv6-riscv-fpga (RV32 FPGA)