How to Connect to a Sun Serial Console from Linux

Linux provides two methods (programs) that can be used to connect to a serial console of a Sun server.

Connecting Using minicom

The first application I'll talk about is "minicom". Most Linux distributions (i.e. Red Hat) already include minicom. If your particular distribution does not include minicom, you can download it from the following URL:

Once you have Minicom installed, start it up with the command "minicom". Press "Ctrl-A Z" to get to the main menu. Press "o" to configure minicom. Go to "Serial port setup" and make sure that you are set to the correct "Serial Device" and that the speed on line E matches the speed of the serial console you are connecting to. (In most cases with Sun, this is 9600.) Here are the settings I made when using my Serial A / COM1 port on my Linux box:

| A - Serial Device : /dev/ttyS0 |
| B - Lockfile Location : /var/lock |
| C - Callin Program : |
| D - Callout Program : |
| E - Bps/Par/Bits : 9600 8N1 |
| F - Hardware Flow Control : Yes |
| G - Software Flow Control : No |
| |
| Change which setting? |
After making all necessary changes, hit the ESC key to go back to the "configurations" menu. Now go to "Modem and dialing". Change the "Init string" to "~^M~". Save the settings (as dflt), and then restart Minicom. You should now see a login prompt.
Connecting Using UUCP

Another common application to use in Linux for connecting to a serial console is UUCP. Most Linux distributions include the UUCP application. Start UUCP with the command "cu -l [device] -s [speed]", where [device] is the serial port you are using, such as ttyS0 (COM1) or ttyS1 (COM2), and [speed] is the speed of the serial console that you are connecting to.

Here is an example:

# cu -l /dev/ttyS0 -s 9600
You may need to hit enter before you see the login prompt. If you see a bunch of weird characters, then you probably specified the wrong speed.

To exit, just type "~.".

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