---
name: "uhci"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["linux", "freebsd", "openbsd"]
url: "https://new.carta.tech/uhci"
---

# uhci(4)

UHCI USB Host Controller driver

## NAME

**uhci** – UHCI USB Host Controller driver

## SYNOPSIS

**device uhci**

## DESCRIPTION

The **uhci** driver provides support for UHCI-type PCI based USB controllers.

## HARDWARE

The **uhci** driver supports all UHCI v1.1 compliant controllers including:

- Intel 82371AB/EB (PIIX4)

- Intel 82371SB (PIIX3)

- VIA 83C572

## SYSCTL VARIABLES

The following variables are available as both [sysctl(8)](/sysctl/8.md) variables and [loader(8)](/loader/8.md) tunables:

- *hw.usb.uhci.debug*

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

## SEE ALSO

[ehci(4)](/ehci/4.md), [ohci(4)](/ohci/4.md), [xhci(4)](/xhci/4.md)

## HISTORY

The **uhci** device driver first appeared in FreeBSD 3.0.

## AUTHORS

The **uhci** driver was written by Lennart Augustsson ⟨*augustss@carlstedt.se*⟩ for the NetBSD project.