Is the serial port UART2 on Hikey970 available?


#1

Hi All,
Does low speed expansion connector UART2 on Hikey970 work?
Why I can’t find a port when I connect to Linux?

Other ports are ok.
Does the kernel have this UART2 driver?
where is the driver, or how to use this serial port?


#2

Connect the uart cable to the low speed header.
Reference the Dragonboard connecting uart if you need to.

After it is connected and the board is on.
In windows use putty, open device manager and look for the com port that uart is connected to.
In linux type ls /dev and look for the Uart Device.
I cant remember the exact name of /dev/tty****

Type sudo screen /dev/tty??? 115200


#3

Hi @Oliver

Any update? I’m also trying to use the UART2 without success.

BR,
Persike.


#4

Hi @persike @Oliver,

UART2 is not enabled on the vendor kernel of Hikey970. You need to manually enable it in board devicetree as below:

&uart2 {
	status = "okay";
};

#5

It worked. Thank you @Mani