Date: Tue, 30 Apr 2002 22:43:04 +0200 (CEST) From: Søren Schmidt <sos@freebsd.dk> To: Gavin Atkinson <gavin@ury.york.ac.uk> Cc: stable@freebsd.org, sos@freebsd.org Subject: Re: DVD/DMA problems Message-ID: <200204302043.g3UKhFfi041888@freebsd.dk> In-Reply-To: <Pine.BSF.4.33.0204301934130.20679-200000@ury.york.ac.uk>
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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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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