Date: Thu, 7 Oct 1999 05:20:02 -0700 (PDT) From: tedm@toybox.placo.com To: freebsd-bugs@FreeBSD.org Subject: Re: i386/13706: FreeBSD identifies all 80486 processors as DX chips Message-ID: <199910071220.FAA57716@freefall.freebsd.org>
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The following reply was made to PR i386/13706; it has been noted by GNATS.
From: tedm@toybox.placo.com
To: "Matt Behrens" <mbehrens@globaldsl.com>,
freebsd-gnats-submit@freebsd.org
Cc:
Subject: Re: i386/13706: FreeBSD identifies all 80486 processors as DX chips
Date: Thu, 07 Oct 99 02:44:46 +0800
Hmmm.... Question for you: Do you actually _have_ a 486SX that you tested
this on?
On my Compaq Presario 486DX2/66 machine running 2.2.8 the output of dmesg
shows:
CPU: i486DX (486-class CPU)
This the only line - there is no additional line showing Origin or features.
Also, the CPU line does NOT show DX2, it only shows DX.
On a customer 486/25SX I see the exact same result, the CPU line shows
i486DX, _not_ i486SX, and there is no Origin or features line.
Both of those systems are running custom-built kernels with only the
cpu I486_CPU defined in the kernel config file.
On a system of mine running 3.2, Generic kernel, I see exactly the same
behavior. I even went and built a custom kernel - and found EXACTLY THE
SAME BEHAVIOR!!!. This was on yet another system running a 486DX2.
Ted
//--- forwarded letter -------------------------------------------------------
> X-Mailer: Mozilla 4.6 [en] (X11; I; Linux 2.2.5-22 i586)
> MIME-Version: 1.0
> Date: Wed, 06 Oct 99 14:10:43 -0400
> From: "Matt Behrens" <mbehrens@globaldsl.com>
> To: freebsd-gnats-submit@freebsd.org,
> tedm@toybox.placo.com
> Subject: Re: i386/13706: FreeBSD identifies all 80486 processors as DX chips
>
> Didn't your dmesg come with two lines after the CPU: line, which look
> like this (from my DX2/40 laptop):
>
> CPU: i486 DX2 (486-class CPU)
> Origin = "GenuineIntel" Id = 0x435 Stepping=5
> Features=0x3<FPU,VME>
>
> >From my 3.2-RELEASE sources (specifically, src/sys/i386/i386):
>
> ---
> #if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
> if(*cpu_vendor)
> printf(" Origin = \"%s\"",cpu_vendor);
> if(cpu_id)
> printf(" Id = 0x%x", cpu_id);
>
> .
> .
> .
>
> /* Avoid ugly blank lines: only print newline when we have to.
> */
> if (*cpu_vendor || cpu_id)
> printf("\n");
>
> #endif
> ---
>
> This section of code has been updated but still showed Origin, Id, and
> etc. back in 2.2.8.
>
> I would think that making sure you have
>
> cpu "I486_CPU"
>
> in your kernel config would at least get the appropriate information to
> see why your SX chip isn't being detected correctly.
>
//----------------------------------------------------------------------------
// Ted Mittelstaedt - tedm@toybox.placo.com
//
// Just because something CAN be done, doesn't mean that it SHOULD be done.
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