Hi 

I have a Gumstix overo sandstorm that i have attached to a Tobi expansion board.
Have connected a usb cable to the  'usb-serial port' shown in the video.
http://www.youtube.com/watch?v=VrEog5zqil8

I tried connecting with kermit
srinath@ubuntu:~$ kermit -l /dev/ttyUSB0
can't open device

Tried with ttyUSB1/2/3 etc. Nothing works

Haven't powered up the board yet, as mentioned in this site.
http://gumstix.org/index.php/hardware-design/get-started/software-development/get-started/connect-to-my-gumstix-system.html

What am i missing?