Output from app core, network core, and TF-M

[afok-esmart]

I wanted to try getting all 3 outputs on my nRF5340DK. I tried following the instructions here - https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/security/tfm.html#manual_connection_to_virtual_com_ports_on_the_nrf5340_dk. I am using the 2 VCOM ports by default i.e., I haven't changed their pins or setup. I have an FTDI connected to P0.25 and P0.26 that is reading the TF-M output.

But I am only able to get the app core output and TF-M output. To test this, I flashed the IPC service sample project (NCS v2.5.0, nrf/samples/ipc/ipc_service), and confirmed I can see app core and network core output. Then I flashed the TF-M secure peripheral sample project (NCS v2.5.0, nrf/samples/tfm/tfm_secure_peripheral), and the app core and TF-M output is as expected. But I don't see network core output (in this case, I would have expected to see the pkt rate/throughput info sent from the IPC sample project).

Anyone have suggestions for what I can investigate? Thanks in advance!

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EDIT #1 - I forgot to mention that the hardware is nRF5340DK 2.0.2 (as mentioned on the white sticker).

[afok-esmart]

(OP replying here) Found the issue. Needed to make sure that CONFIG_BOARD_ENABLE_CPUNET=y was set in the 'app core firmware', in my .conf file.

The TF-M project didn't set this by default, and generally if the network core needs to be used, it's the application core that starts up the network core (see Håkon's reply here - nrf5340 debug network core? - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com))