setserial Version 2.10
Setserial is a program which allows you to look at and change various
attributes of a serial device, including its port, its IRQ, and other
serial port options.
Starting with Linux 0.99 pl10, only the COM1-4 ports are configured,
using the default IRQ of 4 and 3. So, if you have any other serial
ports provided by other boards (such as an AST Fourport), or if COM3-4
have been a non-standard IRQ so that you can use time simultaneously
with COM1-2, you *must* use this program in order to configure those
serial ports.
The simplest way to configure the serial ports is to copy the provided
rc.serial file to /etc/rc.serial, and then add to /etc/rc the lines:
if [ -f /etc/rc.serial ]; then
sh /etc/rc.serial
fi
Take a look at /etc/rc.serial; it was written to be relatively easy to
modify, and you may need to modify it so that it works best in your
environment.
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Here is setserial's command line syntax:
usage: ./setserial [-abgqvVW] serial-device [cmd1 [arg]] [cmd2] ...
Available options:
-a Display all possible information about the port
-b Display boot-time level of information
-q Quiet flag
-v Verbose flag
-g Get and display the serial information of all
serial ports on the machine
-V Display the current Version and then exit
-W Do wild interrupt initialization and then exit
Available commands: (* = Takes an argument)
(^ = can be preceded by a '^' to turn off the option)
* port set the I/O port
* irq set the interrupt
* uart set UART type (none, 8250, 16450, 16550, 16550A
* baud_base set base baud rate (CLOCK_FREQ / 16)
* divisor set the custom divisor (see spd_custom)
^ fourport configure the port as an AST Fourport
autoconfigure automatically configure the serial port
^ auto_irq try to determine irq during autoconfiguration
^ skip_test skip UART test during autoconfiguration
^ sak set the break key as the Secure Attention Key
^ session_lockout Lock out callout port across different sessions
^ pgrp_lockout Lock out callout port across different process groups
^ split_termios Use separate termios for callout and dailin lines
^ hup_notify Notify a process blocked on opening a dialin line
when a process has finished using a callout
line by returning EAGAIN to the open.
^ callout_nohup Don't hangup the tty if carrier detect drops on a
callout line.
spd_hi use 56kb instead of 38.4kb
spd_vhi use 115kb instead of 38.4kb
spd_cust use the custom divisor to set the speed at 38.4kb
(baud rate = baud_base / custom_divisor)
spd_normal use 38.4kb when a buad rate of 38.4kb is selected
Use a leading '0x' for hex numbers.
CAUTION: Using an invalid port can lock up your machine!
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