Both the Size 3 Linux Tibbo Project PCB (LTPP3) and LTPP3(G2) support using a serial connection to access a command-line interface, which is useful during the initial setup, maintenance, and recovery.
The LTPP3 requires Tibbit #01 in socket S17 to provide a serial port and #19 in socket S18 to provide a DB9M connector, as well as a serial cable — and likely a serial-to-USB adapter — to connect it to your computer.
The LTPP3(G2) only requires a cable with at least one USB Type-C connector for use with its embedded serial-over-USB port. If the board is installed in a Size 3 Linux Tibbo Project Box, the top cover — and vibration protection plate, if present — must be removed to access the serial-over-USB port.
On the software side, you'll need a serial console, such as Tibbo's IO Ninja, which has versions for numerous operating systems. Whichever software package you choose to use, it must be set to a baud rate of 115,200, eight data bits, no parity, one stop bit, and hardware and software flow control should be disabled.
Establishing a connection
Begin by connecting the cable to the device's serial port and then to your computer. If you'll require network connectivity, plug an Ethernet cable into any available port.
Before connecting the power supply, which would turn on the device, we recommend that you have your serial console software set up and ready to go to watch for any errors as the device boots up. When you're ready, connect the power supply to the device and start the session in the software if you haven't already. You should immediately see output in the serial console software; if you do not, check that the device is powered up and properly connected, then try again.
After the device has booted up, you will be presented with a login prompt. By default, the root account's password is 123. We strongly recommend that you change this password upon your first login. To change the password, use the command passwd root. You will be prompted to enter a new password and then confirm it.