svn commit: r341682 - head/sys/sys

Tue Dec 11 11:40:49 UTC 2018

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In message <CANCZdfoHWZ7w8jS-73EWEzATKRQ2LaE2cy2uhADf1rcjzuZrvA at 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.

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