Updated: October 26, 2022

Driver for serial PCIs

Note: You must be root to start this driver.


devc-serpci [vid=vid,did=did[,pci=pci]] [options] &

Runs on:

QNX Neutrino


In addition to the devc-ser* options, this driver supports the following options:

-a number[:flag]
Manually specify the base clock frequency and optionally a platform-specific flag (an unsigned integer). If you set the clock frequency to a nonzero value, the driver calculates the minimum required clock frequency to meet the baud rate, and overrides the input clock rate (-c) with that value. Set the frequency to 0 to indicate that the clock isn't configurable. The default setting of this parameter varies by platform.
-c clock[/divisor]
Define a custom clock rate, in Hertz, and a divisor for the serial port. The default (-c 1843200/16) is suitable for compatible PC serial ports.
The PCI device ID, in hexadecimal (0xXXXX).
The PCI index, in decimal (XX).
-t number
Enable the receive FIFO and set its threshold to 1, 4, 8, or 14 characters. The default is 0 (trigger disabled).
-u number
Append number to the device name prefix (/dev/ser). The default is 1; additional devices are given increasing numbers.
The PCI vendor ID, in hexadecimal (0xXXXX).


The devc-serpci manager is a small serial device manager for the QNX Neutrino RTOS. This driver supports 16Cxxx compatible Serial PCI cards.

Note: The boards must use PCI I/O space for the registers, and the ports must be contiguous in memory.