Date: Sat, 1 Apr 2000 01:39:59 +0400 From: Grigoriy Strokin <grg@philol.msu.ru> To: Jason Garman <jgarman@wedgie.org> Cc: Thomas K?llmann <koellmann@gmx.net>, Grigoriy Strokin <grg@philol.msu.ru>, freebsd-stable@FreeBSD.ORG Subject: Re: New kernel with its ATA drivers damages the filesystem Message-ID: <20000401013959.A48268@isabase.philol.msu.ru> In-Reply-To: <20000331163527.B24581@got.wedgie.org>; from jgarman@wedgie.org on Fri, Mar 31, 2000 at 04:35:27PM -0500 References: <20000331022130.A4045@isabase.philol.msu.ru> <20000331142357.A1291@home.net> <20000331163527.B24581@got.wedgie.org>
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On Fri, Mar 31, 2000 at 04:35:27PM -0500, Jason Garman wrote:
> On Fri, Mar 31, 2000 at 02:23:57PM +0200, Thomas K?llmann wrote:
> >
> > Please excuse if this was mentioned before (I did not follow this
> > thread very closely), but isn't _not_ using
> >
> > options ATA_ENABLE_ATAPI_DMA
> >
> > enough as a measure of precaution?
> >
> > This is from LINT:
> >
> > # ATA_ENABLE_ATAPI_DMA: enable DMA on ATAPI device, since many ATAPI
> > # devices claim to support DMA but doesn't actually work, this is
> > # not enabled as default.
> >
> Note there is a subtle distinction between ATAPI devices and ATA hard
> disks. The devices which that option disables DMA for are devices like
> CD-ROMs, IDE zip drives, etc. -- NOT normal IDE hard drives -- they use
> DMA with the new driver regardless of that setting.
>
Interestingly, commenting out this option doesn't affect the mode for my CD-ROM
either.
sysctl reports
hw.atamodes: dma,---,dma,---,
First dma is for ad0, second for acd0.
And dmesg reports using UDMA-33 for CDROM, too.
acd0: CDROM <FX4010M> at ata1-master using UDMA33
--
=== Grigoriy Strokin, Lomonosov University (MGU), Moscow ===
=== contact info: http://isabase.philol.msu.ru/~grg/ ===
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