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Date: Thu, 3 Mar 2005 15:54:39 +0000
From: Paul Richards <paul@originative.co.uk>
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Subject: Re: cvs commit: src/share/man/man4 ata.4
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On Thu, Mar 03, 2005 at 05:29:24PM +0200, Peter Pentchev wrote:
> On Thu, Mar 03, 2005 at 12:01:06PM +0000, Paul Richards wrote:
> > On Sun, Feb 27, 2005 at 02:23:04PM +0000, Peter Pentchev wrote:
> > > roam        2005-02-27 14:23:04 UTC
> > > 
> > >   FreeBSD src repository (doc,ports committer)
> > > 
> > >   Modified files:        (Branch: RELENG_5)
> > >     share/man/man4       ata.4 
> > >   Log:
> > >   MFC rev. 1.47 and 1.48: the default for hw.ata.atapi_dma is now DMA,
> > >   not PIO.
> > 
> > Is this wise? My box won't boot with DMA switched on.
> 
> Mmm... Is *what* wise? :)  This commit only documents the kernel's behavior,
> which has been the case ever since rev. 1.217 of src/sys/dev/ata/ata_all.c
> from August 1 2004.  You'll have to talk to Soeren about the wisdom of
> enabling ATA and ATAPI DMA by default - and then, this only happens if the
> devices actually support it, as described in the documentation.


Hah, those documents are dangerous :-)

I've always had dma switched off in my loader.conf from the days
when that was recommended. I've tried switching dma on recently
(about a month ago) and it caused the boot to hang when probing for
ATAPI devices.

-- 
Paul Richards