From owner-freebsd-hackers  Fri Dec 22 15:22:32 2000
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Date: Fri, 22 Dec 2000 18:22:19 -0500
From: Sergey Babkin <babkin@bellatlantic.net>
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To: Mike Smith <msmith@FreeBSD.ORG>
Cc: heckfordj@psi-domain.co.uk, freebsd-hackers@FreeBSD.ORG
Subject: Re: Pentium 4
References: <200012212115.eBLLFDj01783@mass.osd.bsdi.com>
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Mike Smith wrote:
> 
> > Is there now support for the Pentium 4 in FreeBSD??
> 
> We've always run on the P4.
> 
> > If so, is there an option such as CPUCLASS 786 in the Kernel??
> 
> No, it's still a 686.

Basically, there are 3 possible issues for Pentium4:

- higher clock frequency (also for newer P3) may cause overflow
in counters of delay loops - hopefully this does not happen in
FreeBSD
- microcode download: it got new model ID, so minor tweaking may be 
needed to make sure that Pentium4 is recognised as upgradable 
(this depends on how model comparison is done for example, Linux 
needed this tweaking, UnixWare did not)
- microcode download: CPUs must be handled one by one sequentially
to accomodate the two-CPUs-on-one-chip technology (to exclude
the case when two logical CPUs on the same chip are being told to 
do microcode upgrade at the same time)

I think that's all.

-SB


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