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boards: beagle: pocketbeagle_2: doc: Add DFU instructions #99430

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35 changes: 35 additions & 0 deletions boards/beagle/pocketbeagle_2/doc/index.rst
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Expand Up @@ -95,6 +95,9 @@ Flashing
A53 Core
========

Using SD Card
-------------

The testing requires the binary to be copied to the BOOT partition in SD card.

To test the A53 core, we build the :zephyr:code-sample:`hello_world` sample with the following command.
Expand All @@ -118,6 +121,38 @@ The SD card can now be used for booting.

The binary will run and print Hello world to the debug port.

DFU
---

While doing rapid development, the SD Card workflow can become cumbersome. Since AM62x platform
supports DFU over USB, we can use it to boot Zephyr applications, without ever having an SD Card
plugged in. For more in-depth instructions, check out the `blog post <https://www.beagleboard.org/blog/2025-11-14-pocketbeagle-2-zephyr-dfu>`_.

1. Download the DFU u-boot binaries. Using `v2025.10-am62-pocketbeagle2-11.02.04 <https://github.com/beagleboard/u-boot-pocketbeagle2/releases/download/v2025.10-am62-pocketbeagle2-11.02.04/>`_ here.

.. code-block:: console

wget https://github.com/beagleboard/u-boot-pocketbeagle2/releases/download/v2025.10-am62-pocketbeagle2-11.02.04/tiboot3-usbdfu.bin
wget https://github.com/beagleboard/u-boot-pocketbeagle2/releases/download/v2025.10-am62-pocketbeagle2-11.02.04/tispl.bin
wget https://github.com/beagleboard/u-boot-pocketbeagle2/releases/download/v2025.10-am62-pocketbeagle2-11.02.04/u-boot-zephyrdfu.img

2. Install `dfu-util <https://dfu-util.sourceforge.net/>`_ CLI.

3. Plug in PocketBeagle 2 and check if it is available.

.. code-block:: console

dfu-util -l

4. Flash. The application path is assumed to be :file:`build/zephyr/zephyr.bin` here.

.. code-block:: console

dfu-util -R -a bootloader -D ./tiboot3-usbdfu.bin
dfu-util -R -a tispl.bin -D ./tispl.bin
dfu-util -R -a u-boot.img -D ./u-boot-zephyrdfu.img
dfu-util -R -a zephyr.bin -D ./build/zephyr/zephyr.bin

M4F Core
========

Expand Down