On Mon, 1 Feb 2010, Alexander Motin wrote: > Date: Mon, 01 Feb 2010 14:18:17 +0200 > From: Alexander Motin <mav_at_FreeBSD.org> > To: Michael Reifenberger <mike_at_reifenberger.com> > Cc: FreeBSD-Current <freebsd-current_at_freebsd.org> > Subject: Re: Odd ada(4) failures when trying using USB scanner > > Michael Reifenberger wrote: >> I'm using -current as of r202157. >> >> When attaching an epson USB scanner and trying to `scanimage -L` >> I get a freeze for some time and the following console logs: >> ... >> ata1: FAILURE - odd-sized DMA transfer attempt 5 % 2 >> ata1: setting up DMA failed > > I would say that scanner application tries to probe all CAM devices, > looking for scanner. While doing it, it uses SCSI/ATAPI commands with > odd-sized transfer sizes. It causes errors from ata(4) and triggers bug > in IXP700 AHCI controller. Odd-sized requests are generally not > supported by ATA/SATA. Second problem is in work now. > Could odd-sized commands be prohibited/ignored by the driver then? Thanks for your work on ATA-CAM anyway! Bye/2 --- Michael Reifenberger Michael_at_Reifenberger.com http://www.Reifenberger.comReceived on Mon Feb 01 2010 - 13:40:48 UTC
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