From owner-freebsd-questions  Wed May 19  2:10: 7 1999
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Date: Wed, 19 May 1999 11:08:06 +0200 (MET DST)
From: John K <john@volvo.se>
To: "Ronald 'Ko' Klop" <ronald@node11a94.a2000.nl>
Cc: freebsd-questions@freebsd.org
Subject: Re: Cyrix 486 kernel options
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Hi

If i remeber corrctly, the 486DX has an internal FPU (Floating Point=20
Unit or...whatever) and the entire 486 series does (except for maybe the SX=
)
Feel free to  correct me if i=B4m wrong here.

Im more familiar with Intel chips. the 80386 had a separate Co Math=20
Processor (FPU) called 80387, and it was about the same size as the CPU :)
maybe Cyrix used external IBM FPU=B4s ?

anyway, on a DX i don=B4t think you need this option.

br
john

On Tue, 18 May 1999, Ronald 'Ko' Klop wrote:

Hello,
>=20
> FreeBSD 3.1-RELEASE reports this as my CPU:
>=20
> CPU: Cyrix 486DX (486-class CPU)
>   Origin =3D "CyrixInstead"  DIR=3D0x031a  Stepping=3D0  Revision=3D3
>=20
> In the LINT-configuration are the following options:
>=20
> # CPU_BLUELIGHTNING_FPU_OP_CACHE enables FPU operand cache on IBM
> # BlueLightning CPU.  It works only with Cyrix FPU, and this option
> # should not be used with Intel FPU.
>=20
> # CPU_DIRECT_MAPPED_CACHE sets L1 cache of Cyrix 486DLC CPU in direct
> # mapped mode.  Default is 2-way set associative mode.
>=20
> # CYRIX_CACHE_WORKS enables CPU cache on Cyrix 486 CPUs with cache
> # flush at hold state.
> #
> # CYRIX_CACHE_REALLY_WORKS enables (1) CPU cache on Cyrix 486 CPUs
> # without cache flush at hold state, and (2) write-back CPU cache on
> # Cyrix 6x86 whose revision < 2.7 (NOTE 2).
>=20
> What is the BlueLightning CPU? Do I need this option?
> How do I know if I have a 486DLC? (Or will FreeBSD report this?)
>=20
> And how do I determine if my CPU has cache flush at hold state or not?
> Which of these options should I use? Or shouldn't I use them?
>=20
> Thanks in advance,
>=20
> Ronald.
>=20
>=20
> --=20
> Ronald Klop
> http://node11a94.a2000.nl/~ronald/
>=20
>=20
>=20
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>=20


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