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Date: Sat, 17 Jan 2009 14:11:16 +0100
From: Luigi Rizzo <rizzo@iet.unipi.it>
To: Patrick Lamaizi?re <patfbsd@davenulle.org>
Message-ID: <20090117131116.GA75751@onelab2.iet.unipi.it>
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	<20090117132020.370b841d@baby-jane>
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Cc: freebsd-stable@freebsd.org, grarpamp <grarpamp@gmail.com>
Subject: Re: USB devices fail to attach as umass scsi da[n]
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On Sat, Jan 17, 2009 at 01:20:20PM +0100, Patrick Lamaizi?re wrote:
> Le Fri, 16 Jan 2009 14:44:59 -0500,
> grarpamp <grarpamp@gmail.com> a ?crit :
> 
> > GENERIC, RELENG_7 a few days past the 7.1 release.
> > SuperMicro 370DER motherboard, most recent bios.
> > The Nikon is set to mass storage. The RCA has no such option.
> > Both have the latest firmware.
> > 
> > By the way, the RCA records natively in mp3 format. Handy as most
> > seem to use some closed format. Worth a try if you need one.
> > 
> > # camcontrol devl - should be: (pass2,da2) when attach is complete
> > scbus2 on umass-sim0 bus 0:
> > < RCA_TKCF2494_US 1.00>            at scbus2 target 0 lun 0
> > (da2,pass2)
> > 
> > # dmesg - reordered a bit
> > umass0: <RCA RCA_TKCF2494_US USB DEVICE, class 0/0, rev 1.10/1.00,
> > addr 2> on uhub0
> > umass0:2:0:-1: Attached to scbus2
> > pass2 at umass-sim0 bus 0 target 0 lun 0
> > pass2: < RCA_TKCF2494_US 1.00> Removable Direct Access SCSI-0 device
> > pass2: 1.000MB/s transfers
> > GEOM: da2 at umass-sim0 bus 0 target 0 lun 0
> > new disk da2
> > da2: < RCA_TKCF2494_US 1.00> Removable Direct Access SCSI-0 device
> > da2: 1.000MB/s transfers
> > da2: 122MB (251136 512 byte sectors: 64H 32S/T 122C)
> > 
> > (da2:umass-sim0:0:0:0): Synchronize cache failed, status == 0x4, scsi
> > status == 0x0
> 
> You can try to add a quirk for this device :
> http://www.root.org/~nate/freebsd/scsi/quirks.html
> 
> [not sure if this is uptodate, i did it in the past (RELENG_5/6) for
> my mp3 player]
> 
> I would start with a DA_Q_NO_SYNC_CACHE quirk.

also, to apply quirks without rebuilding a kernel you can use the recent
'kldpatch' port -- the man page contains an example for umass.ko
that should cover your case (by changing the numbers of course)

	cheers
	luigi