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reset serial port

If you plug in the serial pins the wrong way around, or if the pins 'jiggle about' you might get invalid data sent over the usb-serial adaptor, which can lock it up, i.e. you don't see any updated output in minicom.
To reset it:
  1. Quit minicom
  2. Unplug both ends of your serial cable
  3. Plug in the bifferboard-end of the serial cable, and wedge the pins firm with a bit of folded card
  4. Plug in the USB-end of the serial cable
  5. Start up minicom
I dunno if all the steps above are necessary, but it always seems to work :-)