# uname -a
FreeBSD desktop.local 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r263711:
Tue Mar 25 15:49:11 MSK 2014
root@desktop.local:/usr/obj/usr/src/sys/MY_DES  amd64

usbconfig list | grep "5.0Gbps"
ugen0.1: <XHCI root HUB 0x8086> at usbus0, cfg=0 md=HOST spd=SUPER
(5.0Gbps) pwr=SAVE (0mA)

and USB3 flash drive
ugen2.4: <Kingston DataTraveler 3.0 PMAP> at usbus2, cfg=0 md=HOST
spd=HIGH (480Mbps) pwr=ON (498mA)
full list http://pastie.org/8963116

dmesg debug mode
xhci0: Intel Lynx Point USB 3.0 controller mem 0xf0420000-0xf042ffff irq 16 at
device 20.0 on pci0
xhci0: attempting to allocate 1 MSI vectors (8 supported)
msi: routing MSI IRQ 265 to local APIC 0 vector 60
xhci0: using IRQ 265 for MSI
xhci0: MSI enabled
xhci0: 32 byte context size.
xhci0: Port routing mask set to 0xffffffff
usbus0 on xhci0
xhci0: usbpf: Attached
uhub0: 21 ports with 21 removable, self powered
Root mount waiting for: usbus0
xhci0: Port routing mask set to 0x00000000
usb_alloc_device: device init 2 failed (USB_ERR_IOERROR, ignored)
ugen0.2: Unknown at usbus0 (disconnected)
uhub_reattach_port: could not allocate new device
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