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Arcom Embedded Linux Technical Manual Configuring AEL

Configuring a port on an additional serial board

You may have added further serial ports to your processor, for example using an Arcom

AIM104-COM4 or third party serial board. If so, you can use the above commands to

configure any of the unused serial ports. Simply choose a free serial port /dev/ttySn and

configure it as described above, in accordance with the settings you have configured on

the peripheral board itself. Consult the peripheral board's documentation for details.

Automatically loading the serial port configuration on boot

At boot time the contents of the file /etc/serial.conf are parsed and the serial ports are

configured accordingly. Each line of the file starts with the name of a device and is

followed by one or more options that are passed to setserial.

For example, to set the irq of COM1 to 7, add the following to /etc/serial.conf:

/dev/ttyS0 irq 7

You can also generate a configuration line using the –G switch to setserial to generate

an entry representing the current state of a port. For example, the following command

appends an entry for /dev/ttyS1 to the configuration file:

# setserial –G /dev/ttyS1 >> /etc/serial.conf

Removing login session from ttyS0

The default installation of AEL is configured to run a login session on ttyS0 (COM1).

This can cause problems if your application wants to use ttyS0, as the two conflict. This

often manifests as the serial port changing baud rate at unusual times.

Before removing all login sessions, either:

•

Ensure you have some other way of logging into the system, such as via

SSH (with a known IP address) or a local console.

-or-

Be prepared to boot to single user mode, as described on page 22

To remove the serial login session, edit /etc/inittab and comment out the following line

by placing a # character at the start:

T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100

Then signal init to reload its configuration by entering:

# telinit q

If you wish you can add another login session on a different serial port by adding lines

as follows:

Tn:23:respawn:/sbin/getty –L ttySn 115200 vt100

(Where n is the number of the serial port to use.)

The Tn identifier must be unique within the entire file. Using T and the serial

port number accomplishes this.

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