From owner-freebsd-stable  Tue Apr 30 13:43:44 2002
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From: Søren Schmidt <sos@freebsd.dk>
Message-Id: <200204302043.g3UKhFfi041888@freebsd.dk>
Subject: Re: DVD/DMA problems
In-Reply-To: <Pine.BSF.4.33.0204301934130.20679-200000@ury.york.ac.uk>
To: Gavin Atkinson <gavin@ury.york.ac.uk>
Date: Tue, 30 Apr 2002 22:43:04 +0200 (CEST)
Cc: stable@freebsd.org, sos@freebsd.org
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It seems Gavin Atkinson wrote:
> 
> Hi all,
> 
> Attached verbose dmesg is of a box running -stable as of a week ago. The
> box has an IDE DVD-ROM drive as secondary master, which seems to fail when
> accessed with DMA enabled (using hw.ata.atapi_dma="1"). While trying to
> access the drive, the followsing errors are given:
> 
> acd0: READ_BIG command timeout - resetting
> ata1: resetting devices .. ata1: mask=03 ostat0=58 ostat2=50
> acd0: ATAPI 14 eb
> acd1: ATAPI 14 eb
> ata1: mask=03 stat0=08 stat1=00
> ata1: devices=0c
> acd0: success setting UDMA2 on Acer chip
> acd1: success setting WDMA2 on Acer chip
> done
> 
> These messages are repeated until eventaully PIO mode is chosen.
> However, obviously while in PIO mode, the drive works too slowly to play a
> DVD properly.
> 
> This problem existed before the new ATA code was imported from current.
> 
> Can anybody help? Or can I help debug this in any way? I see similar
> problems to this in the archive, but none are the same, and none have a
> resolution that works.

Your drive probably doesn't do DMA right (lots of ATAPI drives doesn't
work with DMA even if they claim to)...

-Søren


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