2.x BSD was also ported to MIPS and some other archs a while back: https://github.com/RetroBSD/retrobsd

I have periodically wondered why we didn't see more of that. It's a small monolithic Unix with the complete stack, including (now rather ancient) TCP/IP networking. Fits in 1 MB of RAM with room to spare. BSD licenced.

From what I remember off the biggest issues are probably that: 1) it is pretty closely tied to the PDP-11 architecture (though not insurmountably) 2) it's pre-ANSI C.

My understanding is that 2bsd is 16 bit clean, which is most of the reason it is still around. A nice OS to run on your 16-bit micro controllers.

However when trying to fact check myself, I found many of the architecture targets are 32-bit, so I may be wrong about this.

see also: retrobsd a 2bsd fork

https://github.com/RetroBSD/retrobsd

That's wild. <4BSD was never on my radar at all, from my first encounters in 1990.

Morally, this isn't really 2.11 anymore after so much backporting and updating, so my questions would be, what's the utility of such a platform, if not nostalgia or legacy support?

Not clear which arches are supported, aside from i386. My love affair with Open/NetBSD was partially sparked by its enormous roster of cool hardware support.