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From: michaelv@MindBender.HeadCandy.com (Michael L. VanLoon)
Newsgroups: comp.os.386bsd.questions
Subject: Re: [FreeBSD 1.1.5.1] Is 486DLC inherently bad? (won't boot!)
Date: 08 Oct 1994 22:45:08 GMT
Organization: HeadCandy Associates... Sweets for the lobes.
Lines: 34
Message-ID: <MICHAELV.94Oct8174509@MindBender.HeadCandy.com>
References: <Cx5Ewx.5M4@isgtec.com> <PST.94Oct7155342@feta.cisco.com>
NNTP-Posting-Host: mindbender.headcandy.iastate.edu
In-reply-to: pst@cisco.com's message of 07 Oct 1994 22:53:42 GMT
In article <PST.94Oct7155342@feta.cisco.com> pst@cisco.com (Paul Traina) writes:
FreeBSD 2.0 recognises the DLC and does the right things (idea & original
code courtesy of NetBSD).
I wrote most of that stuff (though it was mutated by both Theo and
Charles), so thanks for the acknowledgment. :-)
Paul
p.s. any netbsd folks out there: you also want to flush the cache any
time the CPU goes into hold state -- this will hopefully cover
dma's outside the 640k-1mb range.
The latest locore.s already does this, depending on what compile-time
options you invoke while building your kernel.
options CYRIX_CACHE_WORKS
invokes the cache in the flush-on-bus-hold mode you describe, for 386
motherboards with no hardware support for DLC caching, while
options CYRIX_CACHE_WORKS, CYRIX_CACHE_REALLY_WORKS
invokes it in full non-stop mode for motherboards that have full
hardware cache support for the DLC.
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Michael L. VanLoon michaelv@HeadCandy.com michaelv@iastate.edu
Free your mind and your machine -- NetBSD free un*x for PC/Mac/Amiga/etc.
Working NetBSD ports: 386+PC, Mac, Amiga, HP300, Sun3, Sun4c, PC532
In progress: DEC pmax (MIPS R2k/3k), VAX, Sun4m
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