To my knowledge none of main distributions support 32-bit RISCV. OpenEmbedde
definitely has it. Most likely the same applies to Buildroot too. There are no
native riscv32 hardware available that would target Linux to my knowledge. It's
mainly tested with QEMU.
IIRC Alibaba/T-HEAD cores are `CONFIG_COMPAT` capable. At least of Fedora/RISCV
side we have no plans to enable CONFIG_COMPAT.
TL;DR There is very little interest in 32-bit RISCV + feature rich operating
systems. Even the tiny and cheap boards with (or without) MMU that are Linux
capable are 64-bit today.
I don't think that anything uses `riscv` arch string. I didn't know it even
existed. Everyone expects `riscv32`, `riscv64` and there are several derivates
in other places (e.g. OpenEmbedded, FreeBSD IIRC).
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