SSH to chip thru USB

from (here)

1. Flash Chip with HEADLESS system
2. Remove jumper between FEL and GND
3. Connect CHIP directly to computer with USB; wait til it's done booting (LED flashes beep-beep)
4. Open OS X Terminal and type: ls -l /dev/tty* Look for the one that is not like the others; for me it was /dev/tty.usbmodem1413
5. Run screen /dev/tty.usbmodem1413 where "usbmodem1413" is what you saw the chip listed as
6. Log in as chip/chip or root/chip