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=57 If anyone has any experience with the xhci_hcd driver, please share. Thanks, Kirk Bocek