NAME

     xhci — USB eXtensible Host Controller driver

SYNOPSIS

     device xhci

DESCRIPTION

     The xhci driver provides support for the USB eXtensible Host Controller Interface, which
     allows use of USB 1.0, 2.0 and 3.0 devices on the same USB port.

     The XHCI controller supports USB connection speeds up to 5.0Gbps when using a USB 3.0
     compliant device.

HARDWARE

     The xhci driver supports XHCI compatible controllers having PCI class 12 (serial bus),
     subclass 3 (USB) and programming interface 48 (XHCI).

SYSCTL VARIABLES

     The following variables are available as both sysctl(8) variables and loader(8) tunables:

     hw.usb.xhci.debug
             Debug output level, where 0 is debugging disabled and larger values increase debug
             message verbosity.  Default is 0.

SEE ALSO

     ehci(4), ohci(4), uhci(4), usb(4)

HISTORY

     The xhci device driver first appeared in FreeBSD 8.2.