UHCI(4)

📦
version 15.1 · 3 versions
, in freebsd 14.5, freebsd 15.1, nixpkgs unstable

💖 UHCI(4) — the Kernel Interfaces Manual, but make it group chat 💖

okay so real talk, this is the uhci page from the Kernel Interfaces Manual (section 4, drivers, iykyk) and honestly it's a little guy with a big job. let's get into it 🫶

✨ NAME ✨

uhci — the UHCI USB Host Controller driver. that's it, that's the name, she's literally named after the thing she does 💅

🌸 SYNOPSIS 🌸

device uhci

that's the whole summoning ritual bestie. one line. put it in your kernel config and she exists 💫

🦋 DESCRIPTION 🦋

so the uhci driver is out here providing support for UHCI-type PCI based USB controllers. PCI based, specifically. UHCI-type, specifically. she knows her lane and she stays in it 👑

🎀 HARDWARE 🎀

the uhci driver supports all UHCI v1.1 compliant controllers, no cap, and the ones called out by name are:

  • Intel 82371AB/EB (PIIX4)
  • Intel 82371SB (PIIX3)
  • VIA 83C572

three icons fr fr, if you've got one of these you're eating 🌈

⚙️ SYSCTL VARIABLES ⚙️

the following variables are available as both sysctl(8) variables and loader(8) tunables — yes, both, she's versatile:

  • hw.usb.uhci.debug — the debug output level. 0 means debugging is disabled, and larger values increase how verbose those debug messages get. default is 0.
🩷 lowkey the default of 0 is the peace-and-quiet setting. crank it up only if you're ready to be perceived.

👀 SEE ALSO 👀

the whole USB host controller friend group honestly, go say hi 💜

📜 HISTORY 📜

the uhci device driver first appeared in FreeBSD 3.0. a legend from day one, we love an origin story ✨

👑 AUTHORS 👑

the uhci driver was written by Lennart Augustsson <augustss@carlstedt.se> for the NetBSD project. give her a hand 💖👏

and that's the page!! this version is the Debian one, dated April 24, 2018 — go off, vintage queen 🎀🦋 slay, and remember: device uhci and you're done 💅

📦 where this page comes from