UCOM(4) | Kernel Interfaces Manual | UCOM(4) |
The portno locator can be used to decide which port to use for device that have multiple external ports.
Note that while ucom supports the (undocumented) pulse-per-second API normally used on conventional serial ports, USB serial devices typically have a varying latency around 1 ms due to the USB frame structure.
July 25, 2014 | NetBSD 7.1 |