Trying to attach a serial console to my RockChip RK3399

[marietto]

Hello

I tried to enable the serial console on my RockChip RK3399 to inspect what happens as soon as FreeBSD boots. This is the tutorial that I'm following :

https://forum.pine64.org/showthread.php?tid=6387

This is the adapter that I'm using :

Code:

Product: CP2102 USB to UART Bridge Controller
usb 1-9: Manufacturer: Silicon Lab
usb 1-9: cp210x converter now attached to ttyUSB0

I followed carefully the instructions but I'm not able to see any message inside the console.

I tried setting port 115200,1500000 and even without setting a speed

On Terminal 1 :

Code:

# screen /dev/ttyUSB0 1500000 (but also 115200 or without a value)

On Terminal 2 :

Code:

# minicom -D /dev/ttyUSB0 -b 1500000 (but also with 115200 or without -b and a value)

The result is the same. No messages inside the console as soon as I power on the board.

Please can you give a look at the pictures that I have attached and help me to understand where could be the mistake :

https://ibb.co/Yn8rhq9
https://ibb.co/99VBxnZS
https://ibb.co/KjFNk28v
https://ibb.co/QvV7rXmr


I followed carefully the tutorial,trying to record what works. It's not easy for me to understand which colors are tied to which pins. It seems that colors change. Unfortunately I'm not using the same adapter of the dude who wrote the tutorial.

The tutorial said to connect black to pin 6 and brown to pin 8. Since my board is exactly the same as the board used by the dude who wrote the tutorial,it should work. But it does not. 


Thank you.