Debugging TF-M with nRF5340-DK 2.0.0

RE: Debugging TF-M with nRF5340-DK 2.0.0

Vidar Berg — Thu, 09 Dec 2021 07:45:40 GMT

We will of course update the documentation to reflect this change.

RE: Debugging TF-M with nRF5340-DK 2.0.0

sphw — Wed, 08 Dec 2021 21:03:20 GMT

That's all very helpful. It would be nice for the documentation on these devices be updated to show that the new DKs have different capabilities and pins.

RE: Debugging TF-M with nRF5340-DK 2.0.0

Vidar Berg — Wed, 08 Dec 2021 17:02:12 GMT

Sorry for the delayed response. I assumed it was just the pin labeling that had changed on the new board, not that the P24 header actually had fewer pins. Turns out the new board has 2 VCOM interfaces unlike our previous revisions which had 3. So that's why they were removed.

As a temporary fix you can change the UART pinout in the TF-M fw to the following:

- RTE_USART1_TXD_PIN 20

- RTE_USART1_RXD_PIN 22

In this file: https://github.com/nrfconnect/sdk-nrf/blob/084f699a52c5b1a7bc867c3fc497b9436f7da192/modules/tfm/tfm/boards/board/RTE_Device.h#L47

You may also consider back porting the following commits for more verbose logging:

https://github.com/zephyrproject-rtos/zephyr/pull/39375

https://github.com/zephyrproject-rtos/zephyr/pull/39737

Then you can enable TFM_EXCEPTION_INFO_DUMP and set TFM_SPM_LOG_LEVEL to 'Debug' to get crashlogs.

RE: Debugging TF-M with nRF5340-DK 2.0.0

sphw — Mon, 06 Dec 2021 15:55:09 GMT

I can't make those connections, since my board lacks the TxD and RxD ports.

RE: Debugging TF-M with nRF5340-DK 2.0.0

Vidar Berg — Mon, 06 Dec 2021 14:11:21 GMT

Hello,

I was not aware that we had removed the silskreen labels for RxD and TxD on the latest board revision, I have to ask the board designers about this. At least they are present on my v0.11.0 boards.

But a first step to check if we can get TF-M logging to work on your board, please make the connections as shown above and then program the TF-M hello world hex below.

TF-M Hello world sample hex ($nrfjprog --program merged.hex --chiperase -r)

devzone.nordicsemi.com/.../05355.merged.hex

Expected log output

Memory layout

Best regards,

Vidar