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From: martinko <gamato@users.sf.net>
Date: Fri, 08 Jan 2010 18:18:56 +0100
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Cc: freebsd-stable@freebsd.org
Subject: Re: driver bug: Unable to set devclass (devname: (null))
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pluknet wrote:
> 2010/1/8 martinko<gamato@users.sf.net>:
>> Hi,
>>
>> This is 8.0-RELEASE-p2 and I see the following during boot:
>>
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: Timecounter "TSC" frequency 1993542975
>> Hz quality 800
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: Timecounters tick every 1.000 msec
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: firewire0: 1 nodes, maxhop<= 0 cable
>> IRM irm(0)  (me)
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: firewire0: bus manager 0
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: usbus0: 12Mbps Full Speed USB v1.0
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: usbus1: 12Mbps Full Speed USB v1.0
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: usbus2: 12Mbps Full Speed USB v1.0
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: usbus3: 480Mbps High Speed USB v2.0
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: driver bug: Unable to set devclass
>> (devname: (null))
>>                                     ^^^^^^^^^^-- ???
>> Jan  8 09:38:46 mb-aw1n-bsd kernel: ad0: 76319MB<HTS548080M9AT00 MG4OA53A>
>> at ata0-master UDMA100
>>
>> I'm not sure which driver spits it out -- perhaps new USB stack ?
>>
>
> There was a thread which might be helpful to identify a buggy driver:
> http://lists.freebsd.org/pipermail/freebsd-current/2009-March/004272.html

Well, in that thread Alexander mentioned ata and that's just next to my 
driver bug message.