My motherboard has onboard USB 3.0 which I've never been able to passthrough.  With esxi 5.5, I am able to see the host detect it using dmesg.

2013-09-26T15:40:50.283Z cpu3:33332)<6> 0000:00:14.0: USB3.0 ports routing map: 0x0 (was x0f)

But this device does not show up as available passthrough devices like the onboard USB 2.0 devices do.  Does anyone have experience in forcing a device to be passed through?

Thanks