using ptl4l as grandmaster

[spencersevilla]

Hi everyone,
I'm a longtime contributor to the open-source-cellular ecosystem (I usually hang out over in open5gs), have used srsRAN as an eNB in the past, but this is my first venture into ORAN. I have an RU that our company purchased, and I've connected it directly to my PC using a 10G SFP+fiber NIC. PC is running Ubuntu 22.04.4 with 5.15.0-1061-realtime kernel.

I am struggling to get a ptp4l lock between my PC and the RU. I'm using the default.cfg configuration provided from srsRANProject/build/configs/ but I am inferring from the guides that it's intended for use with a switch in the middle that (I presume) acts as the grandmaster. The engineers from the company that made the RU are helpful, and are telling me that my ptp4l configuration/behavior is wrong and should be acting far differently.

I know this topic is a bit out of scope for the srsRAN project but I've really struggled to find comprehensive guides or good information about ptp4l anywhere else. All I get are either very high-level information (i.e. what IEEE-1588 is) or very low-level information (i.e. what the config options do). I was wondering if there was a good example cfg for acting as a grandmaster, or if someone in this community had some great pointers, or could point me at better ptp4l resources. Thanks a ton!

[spencersevilla]

This is resolved; I was eventually able to create a correct .cfg file that works as a grandmaster. It is uploaded here and I will also open a PR to add it to the sample configs.
grandmaster.txt