docs/rp2: Add a small factory reset page.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

docs/reference/reset_boot.rst

@@ -245,6 +245,7 @@ The specific process(es) are different on each port:
 
 - :doc:`pyboard and stm32 port instructions </pyboard/tutorial/reset>`
 - :doc:`renesas-ra port instructions </renesas-ra/tutorial/reset>`
+- :doc:`rp2 port instructions </rp2/tutorial/reset>`
 - :doc:`wipy port instructions </wipy/tutorial/reset>`
 
 For ports without specific instructions linked above, the factory reset process

docs/rp2/tutorial/intro.rst

@@ -8,4 +8,5 @@ Let's get started!
 .. toctree::
     :maxdepth: 1
 
+    reset.rst
     pio.rst

docs/rp2/tutorial/reset.rst

@@ -0,0 +1,18 @@
+Factory reset
+=============
+
+If something unexpected happens and your RP2xxx-based board no longer boots
+MicroPython, then you may have to factory reset it. For more details, see
+:ref:`soft_bricking`.
+
+Factory resetting the MicroPython rp2 port involves fully erasing the flash and
+resetting the flash memory, so you will need to re-flash the MicroPython
+firmware afterwards and copy any Python files to the filesystem again.
+
+1. Follow the instructions on the Raspberry Pi website for `resetting flash
+   memory`_.
+2. Copy the MicroPython .uf2 firmware file to your board. If needed, this file
+   can be found on the `MicroPython downloads page`_.
+
+.. _resetting flash memory: https://www.raspberrypi.com/documentation/microcontrollers/pico-series.html#resetting-flash-memory
+.. _MicroPython downloads page: https://micropython.org/download/?port=rp2