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Date: Mon, 06 Jan 2014 10:52:32 +0100
From: Hans Petter Selasky <hps@bitfrost.no>
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Subject: Re: Install 10.0-RC3 on MacBookPro Late 2013
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Cc: Adrian Chadd <adrian@freebsd.org>,
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On 01/06/14 10:41, Huang Wen Hui wrote:
> % grep xhci dmesg-xhci-debug.txt | more
> xhci0: <Intel Lynx Point USB 3.0 controller> mem 0xc1e00000-0xc1e0ffff at
> device 20.0 on pci0
> xhci0: attempting to allocate 1 MSI vectors (8 supported)
> xhci0: using IRQ 266 for MSI
> xhci0: MSI enabled

Those USB timeouts are most likely due to port routing not working 
properly. It is because intel did something special to their lynx point 
series.

Try to set :

hw.usb.xhci.xhci_port_route = "-1"

in /boot/loader.conf

--HPS