UHCI(4) BSD Kernel Interfaces Manual UHCI(4)NAME
uhci -- UHCI USB Host Controller driver
The uhci driver provides support for UHCI-type PCI based USB controllers.
The uhci driver supports all UHCI v1.1 compliant controllers including:
o Intel 82371AB/EB (PIIX4)
o Intel 82371SB (PIIX3)
o VIA 83C572
SEE ALSO ehci(4), ohci(4)HISTORY
The uhci device driver first appeared in FreeBSD 3.0.
The uhci driver was written by Lennart Augustsson <email@example.com> for the NetBSD project.
BSD April 20, 2005 BSD
Check Out this Related Man Page
EHCI(4) BSD Kernel Interfaces Manual EHCI(4)NAME
ehci -- USB Enhanced Host Controller driver
The ehci driver provides support for the USB Enhanced Host Controller Interface, which is used by USB 2.0 controllers.
EHCI controllers are peculiar in that they can only handle the USB 2.0 protocol. This means that they normally have one or more companion
controllers (i.e., ohci(4) or uhci(4)) handling USB 1.x devices. Consequently each USB connector is electrically connected to two USB con-
trollers. The handling of this is totally automatic, but can be noticed since USB 1.x and USB 2.0 devices plugged in to the same connector
appear to connect to different USB busses.
SEE ALSO ohci(4), uhci(4), usb(4), xhci(4)HISTORY
The ehci device driver first appeared in FreeBSD 5.1.
When the kernel has been compiled with options USB_DEBUG, some tunables become available that affect the behavior of ehci. These tunables
can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).
This tunable enables the lost interrupt quirk. The default value is 0 (off).
This tunable enables the EHCI doorbell quirk. The default value is 0 (off).
This tunable disables USB devices to attach like HIGH-speed ones and will force all attached devices to attach to the FULL- or LOW-
speed companion controller. The default value is 0 (off).
BSD March 4, 2012 BSD
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