Last modified: Jun. 13, 2009
Contents
1 - Summary
2 - Kernel options
3 - Plug in USB serial adapter
4 - Connect to router
1 - Summary
This guide explains how to use a USB serial adapter in FreeBSD. It also
explains how to connect to a device like a router over a serial connection.
As an example we will connect to a Cisco router. This has been tested in
FreeBSD 7.0 and 7.1.
2 - Kernel options
You will need to have the following options in your kernel.
device uhci # UHCI PCI->USB interface
device ohci # OHCI PCI->USB interface
device ehci # EHCI PCI->USB interface (USB 2.0)
device usb # USB Bus (required)
device ugen # Generic
device ucom # USB serial support
device uplcom # USB support for Prolific PL-2303 serial adapters
If you didn't already have them in your kernel you will need to reboot before
using the USB serial adapter.
3 - Plug in USB serial adapter
Log in with a normal user account. Plug in the USB serial adapter into the
computer and check to make sure it was detected properly.
# dmesg | tail -n 1
ucom0: Prolific Technology Inc. USB-Serial Controller, class 0/0, rev 1.10/3.00,
addr 2 on uhub0
Find what the actual device is listed as.
# ls -l /dev/cuaU*
crw-rw---- 1 uucp dialer 0, 116 Mar 2 18:54 /dev/cuaU0
crw-rw---- 1 uucp dialer 0, 117 Mar 2 18:54 /dev/cuaU0.init
crw-rw---- 1 uucp dialer 0, 118 Mar 2 18:54 /dev/cuaU0.lock
In our example it's listed as /dev/cuaU0.
4 - Connect to router
Connect a serial cable from the USB serial adapter to the console port on
the back of the Cisco router. Type the following and press [Enter] to connect.
# sudo cu -l /dev/cuaU0 -s 9600
Connected
User Access Verification
Username: xxx
Password: xxx
Welcome to router.test.com!
router>
When you are done type exit.
router>exit
router con0 is now available
Press RETURN to get started.
Type '~.' to exit. Press 'Shift+~' then period.
~
[EOT]
#
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