From owner-freebsd-hackers  Fri Nov  3 13:29:15 2000
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Date: Fri, 03 Nov 2000 22:29:06 +0100
From: Hans Ottevanger <hansot@iae.nl>
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To: John Summerfield <summer@OS2.ami.com.au>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: Broken PCI-IDE RZ1000 & ata
References: <200011030901.eA391mt30196@possum.os2.ami.com.au>
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John Summerfield wrote:
> 
> --------
> > Dear All,
> >
> > >
> > > > > Well, that chip is so broken by design, no software workaround
> > > > > can help its misery, a hardware fix exists, but cant (easily) be
> > > >
> > > > As Volker notes; Linux can work round it. So can OS/2. I
> > > > don't know the details, but there ARE modes where it works.
> > >
> > > Nope, there are not, even the manufacturer agrees to that....
> > >
> > As much as I like ... err ... technical discussion, perhaps it's time that
> > either side came up with something solid. "Linux can" and "Manufacturer
> > agrees" are not solid, IMHO.
> >
> > The Linux code states that the workaround is perfect in what source file?
> 
> I did not say it's perfect. However, read this:
> 
> /usr/src//linux-2.2/drivers/block/rz1000.c
> 
> It starts:
> /*
>  *  linux/drivers/block/rz1000.c Version 0.05  December 8, 1997
>  *
>  *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
>  */
> 
> /*
>  *  Principal Author:  mlord@pobox.com (Mark Lord)
>  *
>  *  See linux/MAINTAINERS for address of current maintainer.
>  *
>  *  This file provides support for disabling the buggy read-ahead
>  *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
>  *
>  *  Dunno if this fixes both ports, or only the primary port (?).
>  */
> 
> The comments in OS/2 fixpacks tell how to use it on OS/2.
> 
> Use the search program in the web pages at http://os2.ami.com.au/os2/ to
> locate directories with names beginning wr_0 (Warp 3) or wr_m0 (Warp 4), read
> the readmes. All it will establish is that they work; not what code trickery
> is needed.
> 

Maybe a look here helps:

http://www.intel.com/procs/support/rz1000/

Kind regards,

Hans


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