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Serial port access

There is a serial port conveniently accessible at the back of the unit. The port uses 3.3V TTL levels as many other of these embedded devices.

The pinout is, couting from the reset button and up:

  1. GND
  2. RXD
  3. TXD
  4. VCC 3.3v

To enter the boot console press i several times during the early bootup.

Once Linux has been booted you will be automatically dropped into a root shell.

A root shell is also provided in the tech support mode, while still running off the initrd.