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UCHCOM(4) Kernel Interfaces Manual UCHCOM(4) NAME uchcom -- WinChipHead CH9102/CH343/CH341/CH340 USB to serial UART dri- ver 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). To load the driver manu- ally, add it to the kld_list in rc.conf(5), or use kldload(8) at run- time. 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 con- trollers: • 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' FILES /dev/ttyU* for callin ports /dev/ttyU*.init /dev/ttyU*.lock corresponding callin initial-state and lock-state de- vices /dev/cuaU* for callout ports /dev/cuaU*.init /dev/cuaU*.lock corresponding callout initial-state and lock-state de- vices SEE ALSO cu(1), tty(4), ucom(4), usb(4) HISTORY The uchcom driver appeared in FreeBSD 8.0 from NetBSD 5.0. FreeBSD 15.0 June 25, 2025 UCHCOM(4)
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | SYSCTL VARIABLES | FILES | SEE ALSO | HISTORY
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