Second 1-wire gpio

Hi folks,

I’m looking for a solution how to configure second 1-wire gpio.

The reason is because I ofter receive “undefined” when looking at the temperature. It might be because of the cable but in order to troubleshoot it I need second port to be configured.
However I’m using BBB with openHAB and owserver to monitor 7 DS18B20 temperature sensors. I also have P9_22 configured (like this article) as 1-wire port but unfortunately when I connect DS18B20 which is using a different (FTP) cable the rest of sensors also shows “undefined”.

Thanks in advance.