I have built my first Diavolino. I used the "power from USB option" and put the right jumper in place. The LED starts blinking after I plugged in the FTDI TTL cable. The LED stops blinking while pressing the reset button.
The problem is that I can't upload any new code, because I don't see a serial device to use. I am using OS X 10.6.7. When I plug in an Arduino UNO, a device file /dev/tty.usbmodem3d21 automatically appears, and disappears when I unplug the Arduino. With the Diavolino and the FTDI TTL cable I don't see any serial device file.
Any ideas what to check would be much appreciated. How would I check the cable for example?