Date: Mon, 1 Feb 2010 15:40:43 +0100 (CET) From: Michael Reifenberger <mike@reifenberger.com> To: Alexander Motin <mav@FreeBSD.org> Cc: FreeBSD-Current <freebsd-current@freebsd.org> Subject: Re: Odd ada(4) failures when trying using USB scanner Message-ID: <alpine.BSF.2.00.1002011537560.79943@gw.reifenberger.com> In-Reply-To: <4B66C689.2000906@FreeBSD.org> References: <4B636812.8060403@FreeBSD.org> <20100130112749.GA1660@garage.freebsd.pl> <20100130114451.GB1660@garage.freebsd.pl> <20100201092334.GB1743@garage.freebsd.pl> <4B66A669.2070406@FreeBSD.org> <alpine.BSF.2.00.1002011225390.79943@gw.reifenberger.com> <4B66C689.2000906@FreeBSD.org>
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On Mon, 1 Feb 2010, Alexander Motin wrote: > Date: Mon, 01 Feb 2010 14:18:17 +0200 > From: Alexander Motin <mav@FreeBSD.org> > To: Michael Reifenberger <mike@reifenberger.com> > Cc: FreeBSD-Current <freebsd-current@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@Reifenberger.com http://www.Reifenberger.com
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