https://devzone.nordicsemi.com/f/nordic-q-a/118670/error-on-nrf54l15-dk-peripheral-uart-compile-undefined-node-label-uart0Hello there, I got an error msg when I tried to compile the Bluetooth LE UART service example for nRF54L15-DK as: &quot; devicetree error: /chosen: undefined node label &#39;uart0&#39; &quot; The screenshot is attached. However, If I change the board config to nRF52840DKen-USTelligent Community 13Thu, 06 Feb 2025 08:46:46 GMThttps://devzone.nordicsemi.com/thread/521669?ContentTypeID=1Thu, 06 Feb 2025 08:46:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d8dc08e9-c83a-42b2-9d80-df56709064c7J&#248;rgen Holmefjord<p>Hi,</p> <p>UART0 is not available in nRF54L15. The numbering of serial instances has changed to using 2 digits, on to identify domain and one to identify instance. See&nbsp;<a href="https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/about.html#ariaid-title4">Peripheral naming conventions</a>.</p> <p>The default UART instance used for Nordic UART service is uart20:&nbsp;<a href="https://github.com/nrfconnect/sdk-nrf/blob/v2.9.0/samples/bluetooth/peripheral_uart/boards/nrf54l15dk_nrf54l15_cpuapp.overlay">https://github.com/nrfconnect/sdk-nrf/blob/v2.9.0/samples/bluetooth/peripheral_uart/boards/nrf54l15dk_nrf54l15_cpuapp.overlay</a></p> <p>It looks like you are building for the _ns target, but there is no overlay for this target included in the sample, you need to create this yourself by replicating the nrf54l15dk_nrf54l15_cpuapp.* files inside boards directory with&nbsp;<span>nrf54l15dk_nrf54l15_cpuapp_ns.* naming. You can also build for the &quot;nrf54l15dk/nrf54l15/cpuapp board&quot;.</span></p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>