From owner-freebsd-questions  Sat Jan 12 13:49: 3 2002
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To: Bernie <Bernie_X@myrealbox.com>
Cc: Tim DeBoer <deboert@cletus.cornhusker.net>, questions@FreeBSD.ORG
Subject: Re: Enabling DMA Access 
In-reply-to: Your message of "Sat, 12 Jan 2002 12:30:23 +0200."
             <20020112122837.W13242-100000@BLAST> 
Date: Sat, 12 Jan 2002 13:49:00 -0800
From: "Kevin Oberman" <oberman@ptavv.es.net>
Message-Id: <20020112214900.297795D13@ptavv.es.net>
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> Date: Sat, 12 Jan 2002 12:30:23 +0200 (EET)
> From: Bernie <Bernie_X@myrealbox.com>
> 
> 
> 
> On Fri, 11 Jan 2002, Kevin Oberman wrote:
> 
> > This is obsolete. The new ata driver now sets this with a sysctl.
> >
> > Add:
> > hw.ata.atapi_dma="1"    # Run the CD-ROM/DVD in DMA mode
> > to /boot/loader.conf.
> >
> > R. Kevin Oberman, Network Engineer
> > Energy Sciences Network (ESnet)
> > Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
> > E-mail: oberman@es.net			Phone: +1 510 486-8634
> >
> 
> Can the same be done for the an IDE HD? do you know anywhere i can
> find more about it?

man ata seems like the logical place to look.

     The following tunables are setable from the loader:

     hw.ata.ata_dma
     set to 1 for DMA access, 0 for PIO (default is DMA).

     hw.ata.atapi_dma
     set to 1 for DMA access, 0 for PIO (default is PIO).

     hw.ata.wc
     set to 1 to enable Write Caching, 0 to disable (default is enabled)
     (WARNING might cause data loss on power failures)

     hw.ata.tags
     set to 1 to enable Tagged Queuing support, 0 to disable (default is dis-
     abled) (only IBM DPTA and DTLA drives support that)

R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net			Phone: +1 510 486-8634

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