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From: Mark Atkinson <atkin901@gmail.com>
Date: Tue, 05 Oct 2010 16:38:17 -0700
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Subject: Re: FYI: USB 3.0 support and the XHCI driver is now fully committed
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On 10/5/2010 3:38 PM, Julian Elischer wrote:
>  On 10/5/10 2:58 PM, Mark Atkinson wrote:
> On 10/05/2010 11:39, Mark Atkinson wrote:
>>>>
>>>> On 10/05/2010 10:09, Mark Atkinson wrote:
>>>>> Root mount waiting for: usbus3 usbus0
>>>>> [hang, waits forever...]
>>>> Well reverting to r213377 exhibits similar behavior, so I guess this is
>>>> not suspect.  I'll keep reverting until I find the breakage.
> Wish I had kept his machine on a closer track with current:
> 
> r212532: working
> r212553: fail
> 
> I'm currently suspecting the one-shot timers are causing this box to
> hang.
> 
> 
>> -current hangs around there on boot under Xen.
>> setting kern.eventtimers.periodic=1  from the boot prompt allows it to
>> continue.

That was next on my list to research that thread, and indeed that works!
Thanks!