There are RISC-V cores, whose designs have been published, which are capable of running a lightweight Linux distro, and even SBCs with them on. T-Head's C906 on the Nezha board is an example.
this post was submitted on 18 Oct 2023
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RISC-V is probably the closest thing we have. But manufacturing is still a huge deal, as you said. Making anything with close to modern performance means dealing with microscopic things. I think it's gonna stay difficult to do until 3d printers advance a lot. Maybe decades if not longer.
RISC-V is just an instruction set -- same idea as x86. While it is, of course, important to also have an open instuction set, that is somewhat separate from this post's intention. I am referring to the physical manufacture of semiconductors, RISC-V, or otherwise.