srs-indoor-ota: X310 FPGA compat mismatch with UHD 4.9 on gNB node (cannot bring up srsRAN gNB)

[Anam Iqbal]

Hi,

I’m trying to use the srs-indoor-ota profile for a 5G Open5GS/srsRAN experiment and I’m running into what looks like a UHD/X310 compatibility issue on the gNB node.

Profile: https://www.powderwireless.net/show-profile.php?uuid=49db0411-6fa5-11ee-9f39-e4434b2381fc

Project: WNS2025
Experiment: https://www.powderwireless.net/status.php?uuid=3148ae4e-c753-11f0-bc80-e4434b2381fc

On cn5g, Open5GS core is running fine and I can capture traffic with tcpdump.

On ota-x310-1-gnuradio-comp I start the gNB with the command from the profile instructions:

sudo /var/tmp/srsRAN_Project/build/apps/gnb/gnb -c /var/tmp/etc/srsran/gnb_rf_x310_tdd_n78_40mhz.yml

and get the following error:

uhd_find_devices reports:

So UHD on the host is 4.9.0, and it’s expecting FPGA compat 39.0, but the radio is still reporting compat 38.0.

I have tried running UHD tools directly and the loader output looked successful. However, when I re-run the gNB command, I still get the exact same error.

So, it looks like X310 is still running the old compat-38 image.

Is there a recommended way from powder to power-cycle the X310? Or, should I fork the profile and add a startup script on the gNB node that runs uhd_images_downloader and uhd_image_loader during startup?

Would appreciate any guidance in this regards!

- Anam

[Ashton Hunt]

With regards to power cycling your SDR, from the list view in your experiment, there should be a row that starts with ota-x310-1-gnb-sdr, and a dropdown to the right end of that row. Have you tried clicking "power cycle" or something similar in that dropdown menu?

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[Anam Iqbal]

That totally worked, power-cycling ota-x310-1 did the trick. Can’t believe I didn’t notice that button before lol. Thanks a ton for pointing it out!