Additional Boot Details

How to boot the board

NavQPlus should boot normally after applying power. While booting, the device will output detailed status information to the serial console, accessible on the UART2 connector. Using the console can provide invaluable debugging information that is difficult to find elsewhere. Once the boot process has completed, the system console is also available by starting an SSH session over (USB-)ethernet or Wi-Fi.

There are DIP switches on board that select the boot source as either SD card or on-board eMMC memory. Ensure their settings match your intentions.

Power requirements for successful boot

If the applied voltage at PWR_IN is too low, the boot process could hang upon initializing the CPU in the Linux kernel. Please make sure that your power input is 5-20V. The NavQPlus has relatively low current requirements and typically will not draw more than 4 watts of power when all on-chip peripherals are enabled, however the board may also supply power to external devices. Ensure that your power source is able to maintain a stable voltage level at the requested current.

If powering from USB-C it is possible with some Linux kernel/boot configurations that the USB-C port hardware is limiting current, or switches modes as software progresses. This may result in a hang or a reboot. If you suspect this is the case, try powering from the PWR_IN port instead.

U-Boot - Observe full boot process through the serial console

The boot process starts with U-Boot, loading the device trees in the boot partition and loading the Linux kernel. If you desire to observe the complete boot process, you will need to monitor the serial console output on UART2 by using the provided USB to serial converter cable.

Shell login

Once the NavQPlus has booted to the shell, the default login credentials are as follows:

Username: user Password: user