[S] Change in flashrom[main]: Add documentation for pico-serprog

[Anastasia Klimchuk (Code Review)]

Anastasia Klimchuk has submitted this change. ( https://review.coreboot.org/c/flashrom/+/82229?usp=email )

Change subject: Add documentation for pico-serprog
......................................................................

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 
Reviewed-on: https://review.coreboot.org/c/flashrom/+/82229
Reviewed-by: Anastasia Klimchuk 
Tested-by: build bot (Jenkins) 
---
M doc/supported_hw/supported_prog/serprog/overview.rst
1 file changed, 12 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Anastasia Klimchuk: Looks good to me, approved

diff --git a/doc/supported_hw/supported_prog/serprog/overview.rst b/doc/supported_hw/supported_prog/serprog/overview.rst
index b274b99..ba01b02 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.
+
+Notable forks are:
+
+`Riku_V's fork https://codeberg.org/Riku_V/pico-serprog`_ which uses the hardware SPI implementation instead of SPI over PIO (programmable IO) which
+sacrifices arbitrary pinouts. The fork also implements custom USB descriptors which allow for custom udev-rules.