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There are Fedora and FreeBSD builds for RISC-V. This particular item seems to have only 8MB though, so not really in (most people's) "computer" realm. ;)

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RISC-V has a base ISA and many extensions, several of which are virtually required to run a "real" OS with features such as virtual memory. Every build of Linux I've seen for RISC-V is for an RVGC processor with an additional privileged mode.

Theoretically it should be possible to run "Linux" on a glorified microcontroller like the OP with μClinux, but I haven't seen that used for "real" work. It certainly couldn't be used as a general purpose OS.

Oh man I was so happy when I migrated from a PC 386SX with 2MB to a Pentium 75 with 8MB!

A joke about a memory-hungry program use to be that EMACS stands for Eight Megabytes And Constantly Swapping.

ELeven Exabytes and Constant TRashing Of Nodes

I went similarly from a 286 with 1MB to a Pentium 166 with 16MB.

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