What is <code>setserial</code>?

# 5 What is `setserial`?

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`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. It was initially written Rick Sladkey, and was heavily modified by Ted T'so `<tytso@athena,mit.edu>`, who also maintains it. The newest version is 2.10, and can be found on the Linux FTP sites. You can find out what version you have by running `setserial` with no arguments.

On boot, only the `ttyS{0-3}` 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 `ttyS{0-3}` have a non-standard IRQ, you must use this program in order to configure those serial ports. For the full listing of options, consult the man page.

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