Cannot find UART on /dev/ttyS

Technical Support
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1

Hello!

I am trying to use UART but cannot find the port.
I installed setserial and when i do

setserial -g /dev/ttyS[0123]

I get

/dev/ttyS0, UART: unknown, Port: 0x0000, IRQ: 0
/dev/ttyS1, UART: unknown, Port: 0x0000, IRQ: 0
/dev/ttyS2, UART: unknown, Port: 0x0000, IRQ: 0
/dev/ttyS3, UART: unknown, Port: 0x0000, IRQ: 0

We have a custom device tree and I believe that the UART is activated. Here it is and the overlay
paletto.dtso (312 Bytes)
.
imx8mm-verdin-data.dtsi (34.3 KB)

2

Please post the entire contents of your /dev directory along with the kernel startup in verbose mode

3

it’s expected, please check this article

4

Yes we found the correct port for the Verdin.

Turns out it also appeared that a resistor had been poorly soldered on.