.. zephyr:board:: nrf54lm20dk

Overview

.. note:: You can find more information about the nRF54LM20B SoC on the nRF54LM20B website. For the nRF54LM20B technical documentation and other resources (such as SoC Datasheet), see the nRF54L documentation page.

The nRF54LM20 Development Kit hardware provides support for the Nordic Semiconductor nRF54LM20B Arm Cortex-M33 CPU.

Hardware

nRF54LM20 DK has two crystal oscillators:

High-frequency 32 MHz crystal oscillator (HFXO)
Low-frequency 32.768 kHz crystal oscillator (LFXO)

The crystal oscillators can be configured to use either internal or external capacitors.

Supported Features

.. zephyr:board-supported-hw::

Programming and Debugging

.. zephyr:board-supported-runners::

Applications for the nrf54lm20dk/nrf54lm20b/cpuapp board target can be built, flashed, and debugged in the usual way. See :ref:build_an_application and :ref:application_run for more details on building and running.

Applications for the nrf54lm20dk/nrf54lm20b/cpuflpr board target need to be built using sysbuild to include the vpr_launcher image for the application core.

Enter the following command to compile hello_world for the FLPR core:

.. code-block:: console

west build -p -b nrf54lm20dk/nrf54lm20b/cpuflpr --sysbuild

Flashing

As an example, this section shows how to build and flash the :zephyr:code-sample:hello_world application.

.. warning::

When programming the device, you might get an error similar to the following message::

ERROR: The operation attempted is unavailable due to readback protection in
ERROR: your device. Please use --recover to unlock the device.

This error occurs when readback protection is enabled. To disable the readback protection, you must recover your device.

Enter the following command to recover the core::

west flash --recover

The --recover command erases the flash memory and then writes a small binary into the recovered flash memory. This binary prevents the readback protection from enabling itself again after a pin reset or power cycle.

Follow the instructions in the :ref:nordic_segger page to install and configure all the necessary software. Further information can be found in :ref:nordic_segger_flashing.

To build and program the sample to the nRF54LM20 DK, complete the following steps:

First, connect the nRF54LM20 DK to you computer using the IMCU USB port on the DK. Next, build the sample by running the following command:

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: nrf54lm20dk/nrf54lm20b/cpuapp :goals: build flash

Testing the LEDs and buttons in the nRF54LM20 DK

Test the nRF54LM20 DK with a :zephyr:code-sample:blinky sample.

.. _nrf54lm20dk_nrf54lm20a:

nRF54LM20A emulation on nRF54LM20 DK

The nrf54lm20dk/nrf54lm20a board is a modified version of the :zephyr:board:nrf54lm20dk that enforces the limitations imposed by the nRF54LM20A IC, which is the NPU-less variant of the original nRF54LM20B IC. Since Nordic does not offer a development kit for the nRF54LM20A, you can use this board to develop for this IC while using the nRF54LM20 Development Kit (PCA10184).

See nRF54LM20A website_ for the official reference on the IC itself.

References

.. target-notes::

.. _nRF54LM20B website: https://www.nordicsemi.com/Products/nRF54LM20B .. _nRF54L documentation: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf54l/index.html .. _nRF54LM20A website: https://www.nordicsemi.com/Products/nRF54LM20A