From owner-freebsd-stable  Tue Apr 30 13:48:32 2002
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Date: Tue, 30 Apr 2002 21:48:23 +0100 (BST)
From: Gavin Atkinson <gavin@ury.york.ac.uk>
To: =?X-UNKNOWN?Q?S=F8ren_Schmidt?= <sos@freebsd.dk>
Cc: <stable@FreeBSD.ORG>
Subject: Re: DVD/DMA problems
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On Tue, 30 Apr 2002, S=F8ren Schmidt wrote:
> It seems Gavin Atkinson wrote:
> > Hi all,
> >
> > Attached verbose dmesg is of a box running -stable as of a week ago. Th=
e
> > box has an IDE DVD-ROM drive as secondary master, which seems to fail w=
hen
> > accessed with DMA enabled (using hw.ata.atapi_dma=3D"1"). While trying =
to
> > access the drive, the followsing errors are given:
> >
> > acd0: READ_BIG command timeout - resetting
=2E..
> > acd0: success setting UDMA2 on Acer chip
> > acd1: success setting WDMA2 on Acer chip
> > done
>
> Your drive probably doesn't do DMA right (lots of ATAPI drives doesn't
> work with DMA even if they claim to)...

That was my first assumption, but dual-booting the box into Windows seems
to disprove this (DVDs can play at full speed, even copying files off them
is 5-10x faster).

Gavin


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