I would imagine that the user land changes made its way into 386 Mach.  Although I haven't seen anything I can recall off the top of my head about 386 commits in user land until much later. 

Maybe one day more of that Mt Xinu stuff will surface, although I'm still amazed I got the kernel to build. 

Internet legend is that the rift was massive.  

From: TUHS <tuhs-bounces@minnie.tuhs.org> on behalf of Larry McVoy <lm@mcvoy.com>
Sent: Sunday, January 19, 2020, 12:26 a.m.
To: Greg 'groggy' Lehey
Cc: UNIX Heritage Society
Subject: Re: [TUHS] Early Linux and BSD (was: On the origins of Linux - "an academic question")

On Sat, Jan 18, 2020 at 03:19:13PM +1100, Greg 'groggy' Lehey wrote: > On Friday, 17 January 2020 at 22:50:51 -0500, Theodore Y. Ts'o wrote: > > > > In the super-early days (late 1991, early 1992), those of us who > > worked on it just wanted a "something Unix-like" that we could run at > > home (my first computer was a 40 MHz 386 with 16 MB of memory). This > > was before the AT&T/BSD Lawsuit (which was in 1992) and while Jolitz > > may have been demonstrating 386BSD in private, I was certainly never > > aware of it > > At the start of this time, Bill was working for BSDI, who were > preparing a commercial product that (in March 1992) became BSD/386. Wikipedia says he was working on 386BSD as early has 1989 and that clicks with me (Jolitz worked for me around 1992 or 3). I don't remember him mentioning working at BSDI, are you sure about that part? Those guys did not like each other at all.