Tribblix: manual page: xhci.4d

XHCI(4D) Devices XHCI(4D)

NAME

xhci - Extensible Host Controller Interface Driver

SYNOPSIS

usb@unit-address

DESCRIPTION

The xhci driver supports PCI devices that implement versions 1.0 and
1.1 of the Extensible Host Controller Interface Specification. These
devices provide support for USB 3.0, USB 2.x, and USB 1.x devices and
is integrated into the broader illumos USB Architecture (USBA).

The xhci driver supports all four USB transfer types: bulk transfers,
control transfers, interrupt transfers, and isochronous transfers.

Administrators do not interact with the xhci driver directly. USB
devices are managed with cfgadm(8). See cfgadm_usb(8) for more
information on how to specifically manage USB devices and how they are
laid out in the system. cfgadm(8) is only used to manage devices at a
USB level. For example, a USB NIC would still be managed with dladm(8)
at a networking level.

On some x86 systems USB ports may be routed to either an instance of
the xhci driver or an instance of the ehci(4D) driver. By default, all
such ports are routed to the xhci driver, allowing those devices to
operate at USB 3.x speed by default. This is most common on Intel
platforms and chipsets. While this is controlled with the xhci-reroute
property discussed below, changing it may not be sufficient to change
the behavior. The BIOS or ACPI data for many x86 systems may toggle
this automatically.

PROPERTIES

The xhci driver supports the following properties which may be tuned in
the xhci driver's driver.conf(5) file.

xhci-reroute
The xhci-reroute property determines whether or not USB ports
are re-routed to the xhci driver. The default behavior is to
route such ports. To disable this, the property should be set
to 0. Any other value, or the lack of the property, cause the
default behavior to take place.

ARCHITECTURE

The xhci driver is only supported on x86 systems at this time.

FILES