Debian
Bookworm releasing without RISC-V support, but it was close.
riscv64
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Although it's not yet in the official architecture list, the riscv64 port
is making good progress. We expect to be in a position to ship trixie with
riscv64 support (subject to architecture qualification later in the cycle).
Now may be a good time to invest in Debian so Trixie (2 years out from 2023) supports RISC-V.
Project could use hardware and attention to build failures.
Rivos experience with Fedora shows that many packages will need small fixes to build. This needs attention, but is overall tractable.
Jul 23, 2023 Debian Announces RISC-V as official architecture, begins building packages.
https://wiki.debian.org/Ports/riscv64
Build Status: https://buildd.debian.org/ (RISC-V)