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.
Any idea about such a problem ?
Which SoM and carrier board version do you use?
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)
The SOM I use is Verdin IMX8MM DL 1GB IT V1.1B serial number 06944094.
The board is Verdin Development Board V1.1C SN 10952569.
The power is 12 V 3A, and when I plug it all the leds near On/off light up.
When I reset the board, the Leds C.TX, C.RX, D.TX and D.RX in the debug area don’t flash.
I have tried with another USB cable, same result.
JP30 is in the 1,8 DBG position.
I can’t try with another module, I don’t have another one.
Hello again @josep.tx , browsing the Toradex community site I have found the solution.
The reset of the board was because I opened /dev/ttyUSB0. If I connect to /dev/ttyUSB3 I get the correct serial line (linux console).
I found the solution in this post : Verdin Development Board Serial Debug Port.
This is the reason why I asked Toradex to change the info in page Serial Terminal Emulator | Toradex Developer Center, changing
Following exactly the instruction on that KB page reboots the SoM, and this is frustrating.
Hello @cch ,
I reopen this topic just to note that the behavior that you were experiencing is documented here:
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.