Hi Juan,

I fully agree with Gregg Levine remarks.

But, for the first look, I maybe see your mistake in GRUB "serial"
command, so there is my first aid:

> but when I write "serial --speed=115200 --word=8 --parity=no --stop=1 usb0"
> this print it:
> 
> "serial port 'usb0' is not found"

Try "serial_usb0" instead of "usb0".

BR,
Ales


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