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From: "Rodney W. Grimes" <freebsd@pdx.rh.CN85.dnsmgr.net>
Message-Id: <201703041553.v24Freaq077437@pdx.rh.CN85.dnsmgr.net>
Subject: Re: svn commit: r314669 - head/sys/i386/conf
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To: Slawa Olhovchenkov <slw@zxy.spb.ru>
Date: Sat, 4 Mar 2017 07:53:40 -0800 (PST)
CC: "Pedro F. Giffuni" <pfg@freebsd.org>, src-committers@freebsd.org,
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> On Sat, Mar 04, 2017 at 03:04:17PM +0000, Pedro F. Giffuni wrote:
> 
> > Author: pfg
> > Date: Sat Mar  4 15:04:17 2017
> > New Revision: 314669
> > URL: https://svnweb.freebsd.org/changeset/base/314669
> > 
> > Log:
> >   Drop i486 from the default i386 GENERIC kernel configuration.
> >   
> >   80486 production was stopped by Intel on September 2007. Dropping the 486
> >   configuration option from the GENERIC kernel improves performance
> >   slightly.
> >   
> >   Removing I486_CPU is consistent at this time: we don't support any
> >   processor without a FPU and the PC-98 arch, which frequently involved i486
> >   CPUs, is also gone so we don't test such platforms anymore.
> 
> What is realy mean?
> Some Via CPU is like i486 (by instruction set).
> 
> CPU: VIA Ezra (800.04-MHz 686-class CPU)
>   Origin="CentaurHauls"  Id=0x678  Family=0x6  Model=0x7  Stepping=8
>   Features=0x803035<FPU,DE,TSC,MSR,MTRR,PGE,MMX>
>   AMD Features=0x80000000<3DNow!>

There is also the whole 486sx family that is 486 die that they turned
the FPU feature off in cause it failed functional test at die sort.


-- 
Rod Grimes                                                 rgrimes@freebsd.org