UCHCOM(4)

UCHCOM(4) — Kernel Interfaces Manual 🦋💅

okay bestie, this is the manual page for uchcom, and it's giving USB-to-serial main character energy. ✨

🎀 NAME 🎀

uchcom — WinChipHead CH9102/CH343/CH341/CH340 USB to serial UART driver. periodt 💖

🌸 SYNOPSIS 🌸

device usb
device ucom
device uchcom

In rc.conf(5):

kld_list="uchcom"

In sysctl.conf(5):

hw.usb.uchcom.debug=1

🦋 DESCRIPTION 🦋

The uchcom driver provides support for the WinChipHead USB to serial UART adapters. If the appropriate hardware is detected, the driver will be loaded automatically by devmatch(8) — auto-load slay. To load the driver manually, add it to the kld_list in rc.conf(5), or use kldload(8) at runtime. The device is accessed through the ucom(4) driver, which makes it behave like a tty(4).

Call out through this interface with applications like cu(1) or tip(1). 🫶

🔥 HARDWARE 🔥

The uchcom driver supports the following USB to serial UART controllers:

• WinChipHead CH9102 (max 6Mbps)
• WinChipHead CH343 (max 6Mbps)
• WinChipHead CH341 (max 2Mbps)
• WinChipHead CH340 (max 2Mbps)

⭐ SYSCTL VARIABLES ⭐

These settings can be entered in the loader(8) prompt, set in loader.conf(5), sysctl.conf(5), or changed at runtime with sysctl(8):

• hw.usb.uchcom.debug — enable debugging messages, default 0. iykyk 🐛

🎀 FILES 🎀

Callin ports:

• /dev/ttyU* — for callin ports
• /dev/ttyU*.init — corresponding callin initial-state device
• /dev/ttyU*.lock — corresponding callin lock-state device

Callout ports:

• /dev/cuaU* — for callout ports
• /dev/cuaU*.init — corresponding callout initial-state device
• /dev/cuaU*.lock — corresponding callout lock-state device

🌈 SEE ALSO 🌈

• cu(1)
• tty(4)
• ucom(4)
• usb(4)

go read the friends, bestie 📚

👑 HISTORY 👑

The uchcom driver appeared in FreeBSD 8.0 from NetBSD 5.0. iconic crossover event 🌈

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source/version: Debian · date: June 25, 2025 — mwah bestie, go forth and serial 💖✨