From owner-freebsd-bugs  Tue Sep 12  9:18:42 2000
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Date: Tue, 12 Sep 2000 09:18:38 -0700 (PDT)
From: Edmar Wiggers <edmarw@yahoo.com>
Subject: Re: i386/21072: Unable to install. Can't write disklabel to ad0 (ata disk0, udma33)
To: sheldonh@FreeBSD.org, freebsd-bugs@FreeBSD.org, sos@FreeBSD.org
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I agree: the system should either start in PIO mode,
or have a kernel configuration variable (settable
interactively via boot loader) to choose PIO/DMA.

Note that if you start your system in PIO mode, itīs
easy to change it do DMA using rc.sysctl (sysctl -w
hw.atamodes=dma...)

However, please note that the obsolete wd driver does
use DMA in my system (I configured it that way), and
it is ok with it.

--- sheldonh@FreeBSD.org wrote:
> Synopsis: Unable to install. Can't write disklabel
> to ad0 (ata disk0, udma33)
> 
> State-Changed-From-To: feedback->open
> State-Changed-By: sheldonh
> State-Changed-When: Tue Sep 12 01:33:11 PDT 2000
> State-Changed-Why: 
> Soren, here's another case that makes it sound like
> it'd
> be better to start the system off in PIO mode,
> although
> I seem to remember you saying that this came with
> its own
> set of problems.
> 
> Perhaps there's some way to pass PIO/DMA mode
> configs to
> the kernel via the boot loader?
> 
> Anyway, it's an interesting PR. :-)
> 
> 
> Responsible-Changed-From-To: freebsd-bugs->sos
> Responsible-Changed-By: sheldonh
> Responsible-Changed-When: Tue Sep 12 01:33:11 PDT
> 2000
> Responsible-Changed-Why: 
> Over to maintainer.
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=21072


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