Custom Board with nRF5340 produces build warning: Warning (unique_unit_address_if_enabled)

[cBroadbo2]

I am new to nRF5x development coming from a heavy STM32 background.  I have successfully created a custom board for use with our company's custom board which has a nRF5340 on it.

nRF Connect SDK: 2.2.0

nRF Connect Toolchain: 2.2.0

OS: macOS Monterey (12.6), Chip Apple M1 Max

I'm able to build and successfully run samples on an nRF5340 DK.

I created my board by copying the necessary pieces of the nrf5340-dk-nrf5340-cpuapp board to my custom board files.  Aside from the warning detailed below, samples (Blinky, most notably) build successfully.

My board produces these warnings when building:

/Users/UserName/Dev/Company/nRF5340DK/blinky/build/zephyr/zephyr.dts:55.33-59.6: Warning (unique_unit_address_if_enabled): /soc/peripheral@40000000/oscillator@4000: duplicate unit-address (also used in node /soc/peripheral@40000000/regulator@4000)
/Users/UserName/Dev/Company/nRF5340DK/blinky/build/zephyr/zephyr.dts:65.22-70.6: Warning (unique_unit_address_if_enabled): /soc/peripheral@40000000/clock@5000: duplicate unit-address (also used in node /soc/peripheral@40000000/power@5000)
/Users/UserName/Dev/Company/nRF5340DK/blinky/build/zephyr/zephyr.dts:65.22-70.6: Warning (unique_unit_address_if_enabled): /soc/peripheral@40000000/clock@5000: duplicate unit-address (also used in node /soc/peripheral@40000000/reset-controller@5000)
/Users/UserName/Dev/Company/nRF5340DK/blinky/build/zephyr/zephyr.dts:71.22-76.6: Warning (unique_unit_address_if_enabled): /soc/peripheral@40000000/power@5000: duplicate unit-address (also used in node /soc/peripheral@40000000/reset-controller@5000)
/Users/UserName/Dev/Company/nRF5340DK/blinky/build/zephyr/zephyr.dts:408.45-453.6: Warning (unique_unit_address_if_enabled): /soc/peripheral@40000000/flash-controller@39000: duplicate unit-address (also used in node /soc/peripheral@40000000/kmu@39000)

From what I've read these can be ignored.  However, I'd like to address these if possible so they don't happen any more.

I do see that there "peripheral@40000000" entries in both .../build/zephyr/zephyr.dts and in nerf5340_cpuappns.dts (which is included in my .dts file).  What I don't understand is that my device tree files are nearly identical to the nrf5340-dk-nrf5340-cpuapp files, yet mine produces those warnings and the stock nrf5340-dk-nrf5340-cpuapp files do not.

Any help fixing this is appreciated.

Thanks,

Craig

[Marte Myrvold]

Hi Craig,

Can you share your board files so I can look at them and test them on my side?

Best regards,
Marte

[cBroadbo2]

Certainly Marte!  Here it is.  Thanks for your help.

vaderb1.zip

Thanks,

Craig

[Marte Myrvold]

Hi Craig,

I did not find any issues with your board files. Comparing them with the board files and the generated devicetree of nRF5340 DK, the nodes have identical unit addresses, as you say.
The reason for these warnings is that the base addresses of the peripherals are identical. For the nrF5340 DK, there is a flag to ignore the warnings, which is why they do not show up when building for this board and only for custom boards. See https://github.com/zephyrproject-rtos/zephyr/issues/29713 for more information. The flag to ignore the warnings is from this pull request https://github.com/zephyrproject-rtos/zephyr/pull/31950. You can let the warnings be, or you can create a file to ignore the warnings as is done here: https://github.com/zephyrproject-rtos/zephyr/pull/31950/files.

Best regards,
Marte

[cBroadbo2]

Thanks Marte.  I'll likely disable the warning.