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To: Warner Losh <imp@bsdimp.com>
cc: Scott Long <scottl@samsco.org>, Konstantin Belousov <kostikbel@gmail.com>, 
 John Baldwin <jhb@freebsd.org>, Kevin Bowling <kevin.bowling@kev009.com>,
 Mateusz Guzik <mjguzik@gmail.com>, Ian Lepore <ian@freebsd.org>,
 svn-src-head@freebsd.org, svn-src-all@freebsd.org,
 src-committers <src-committers@freebsd.org>,
 Scott Long <scottl@freebsd.org>
Subject: Re: svn commit: r341682 - head/sys/sys
In-reply-to: <CANCZdfoHWZ7w8jS-73EWEzATKRQ2LaE2cy2uhADf1rcjzuZrvA@mail.gmail.com>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
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Date: Tue, 11 Dec 2018 11:40:45 +0000
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--------
In message <CANCZdfoHWZ7w8jS-73EWEzATKRQ2LaE2cy2uhADf1rcjzuZrvA@mail.gmail=
.com>
, Warner Losh writes:

>We haven't ever supported SMP on i486, to my knowledge.

There were never any usable i486 SMP hardware.

The i486 CPU was not designed to do SMP so getting two CPUs to talk
together (IPIs and all that) required a lot of glue-logic, which
never got chip-ified.

A few prototypes were built, but nothing ever reached production,
least of all HP's 1000xi486 chip "mainfram" project.

-- =

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    =

Never attribute to malice what can adequately be explained by incompetence=
.