I use a Verdin development board with IMX8MMDL 1GB IT.
The board seems to start correctly when I plug the power, but if I plug a USB-C cable in X66 to get Debug serial line, the board stops as soon as some software opens the /dev/ttyUSB0 device (tested with gtkterm and minicom).
In fact when starting the software all leds turn off except +V5 STB and debug leds.
Do all the LED’s next to the ON/OFF button light up?
How are you powering the board (voltage and intensity)
Do the Tx and Rx LEDS flash when you reset the board?
Is the JP30 in the 1-2 position (1.8V DBG)?
Have you tried using another USB cable? Or have tried the same USB cable with another device to rule out the possibility of a defective cable?
Have you tried with another module? (if you have more than one)
thanks for the pointer. Nevertheless it’s quite unusual, as with most boards /dev/ttyUSB0 is the serial line for debug, so it’s easy to generate a reset if we don’t find this article.
For me I’m know aware of the solution.