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Date:      Tue, 18 May 1999 23:01:15 +0200 (CEST)
From:      "Ronald 'Ko' Klop" <ronald@node11a94.a2000.nl>
To:        freebsd-questions@freebsd.org
Subject:   Cyrix 486 kernel options
Message-ID:  <Pine.BSF.4.05.9905182300490.1228-100000@dlanor.evertsen.nl>

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Hello,

FreeBSD 3.1-RELEASE reports this as my CPU:

CPU: Cyrix 486DX (486-class CPU)
  Origin = "CyrixInstead"  DIR=0x031a  Stepping=0  Revision=3

In the LINT-configuration are the following options:

# 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.

# CPU_DIRECT_MAPPED_CACHE sets L1 cache of Cyrix 486DLC CPU in direct
# mapped mode.  Default is 2-way set associative mode.

# 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).

What is the BlueLightning CPU? Do I need this option?
How do I know if I have a 486DLC? (Or will FreeBSD report this?)

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?

Thanks in advance,

Ronald.


-- 
Ronald Klop
http://node11a94.a2000.nl/~ronald/



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