nRF54L15 UART21 shell RX on P2 only works with CONSTLAThttps://devzone.nordicsemi.com/f/nordic-q-a/127380/nrf54l15-uart21-shell-rx-on-p2-only-works-with-constlatnRF54L15: UARTE on P2 pins (P2.07/P2.08) shell RX only reliable when `SOC_NRF_FORCE_CONSTLAT=y` Environment - SoC: nRF54L15 (CPUAPP) - Board: custom board ( `battery_nrf54_mps` ) - SDK/Zephyr basis in workspace: - Zephyr: `4.3.0` - NCSen-USTelligent Community 13Wed, 11 Mar 2026 12:52:07 GMTRE: nRF54L15 UART21 shell RX on P2 only works with CONSTLAThttps://devzone.nordicsemi.com/thread/563021?ContentTypeID=1Wed, 11 Mar 2026 12:52:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:10584c45-b73f-4634-b9ca-11871bcfd7cbVidar Berg<p>Hello,</p> <p>UART21 should normally or ideally be assigned pins from GPIO P1 as the are in the same domain, but as you have found out, it is possible to use pins from P2 as well if you use the constant latency sub power mode, please see&nbsp;<a href="https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/chapters/pin.html#d380e188">Cross power-domain use</a>&nbsp;and&nbsp;<a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf54l/pinmap.html">https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf54l/pinmap.html</a>.</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>