I'm struggling with the xhci_hcd driver trying to get a NEC Corporation uPD720200 USB 3.0 Host Controller working under CentOS 6 x86_64. I've documented my efforts in the forums:

https://www.centos.org/modules/newbb/viewtopic.php?topic_id=32237&forum=...

If anyone has any experience with the xhci_hcd driver, please share.

Thanks, Kirk Bocek