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 Message-ID: <4B66C689.2000906@FreeBSD.org> In-Reply-To: <alpine.BSF.2.00.1002011225390.79943@gw.reifenberger.com> 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>
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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. -- Alexander Motin
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