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Add documentation for pico-serprog

This commit adds documentation for pico-serprog by stacksmashing:
https://github.com/stacksmashing/pico-serprog
and its fork by Riku_V: https://codeberg.org/Riku_V/pico-serprog
to the serprog overview page.

Change-Id: I457dfec52f89997f64b6c276c50b329359d61b77
Signed-off-by: Funkeleinhorn <git@funkeleinhorn.com>
---
M doc/supported_hw/supported_prog/serprog/overview.rst
1 file changed, 12 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/29/82229/1

diff --git a/doc/supported_hw/supported_prog/serprog/overview.rst b/doc/supported_hw/supported_prog/serprog/overview.rst
index b274b99..b748ca6 100644
--- a/doc/supported_hw/supported_prog/serprog/overview.rst
+++ b/doc/supported_hw/supported_prog/serprog/overview.rst
@@ -81,3 +81,15 @@
 
 A powerful option is `stm32-vserprog <https://github.com/dword1511/stm32-vserprog#stm32-vserprog>`_, a firmware for various STM32-based boards
 that turns them into serprog-based programmers with SPI clock speeds up to 36 MHz.
+
+pico-serprog
+------------
+
+`pico-serprog <https://github.com/stacksmashing/pico-serprog>`_ by stacksmashing is a firmware for
+`Raspberry Pi Picos <https://www.raspberrypi.com/documentation/microcontrollers/raspberry-pi-pico.html>`_ and other RP2040 based boards which turns them
+into a serprog programmer. There is an bigger existing `fork by Riku_V <https://codeberg.org/Riku_V/pico-serprog>`_ which implements some things differently.
+Notable differences are:
+
+The fork uses the hardware SPI implementation over SPI over PIO (programmable IO) which allows for better performance but sacrifices arbitrary pinouts for that.
+Also USB descriptors have been implemented in the fork allowing custom udev-rules.
+

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