From owner-freebsd-stable  Mon Apr  9  8:28: 4 2001
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Date: Mon, 09 Apr 2001 17:27:57 +0200
From: "Jose M. Alcaide" <jose@we.lc.ehu.es>
Organization: Universidad del Pais Vasco - Dpto. de Electricidad y Electronica
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To: Kevin Oberman <oberman@es.net>
Cc: stable@FreeBSD.ORG
Subject: Re: Enabling ata write cache in -Stable
References: <200104091454.f39Eskc00975@ptavv.es.net>
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Kevin Oberman wrote:
> 
> I see that the ATA_ENABLE_WC option has left the kernel. Is there any
> way to temporarily re-enable it at boot time? I see hw.ata.wc, but it
> is read-only. I only want to use the write cache when running
> stand-alone and using dd to copy my hard drive.
> 
> I've checked the man pages and the release notes and I don't see
> anything.
> 

I bumped into this same problem and, after reading the ata(4) manpage
several times, I noticed that it says:

  The following tunables are setable from the loader:
                                     ^^^^^^^^^^^^^^^

so you only need to add hw.ata.wc="1" to /boot/loader.conf.

BTW, I think that these new ata kernel tunables should be added to
/boot/defaults/loader.conf.

Cheers,
-- JMA
****** Jose M. Alcaide  //  jose@we.lc.ehu.es  //  jmas@FreeBSD.org ******
** "Beware of Programmers who carry screwdrivers" --  Leonard Brandwein **

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