pico-serprog

This is a very basic flashrom/serprog compatible SPI flash reader/writer for the Raspberry Pi Pico.

It does not require a custom version of flashrom, just drag the compiled uf2 onto your Pico and you're ready to go.

The default pin-out is:

GPIO	Pico Pin	Function
1	2	CS
2	4	SCK
3	5	MOSI
4	6	MISO
5	7	CRESET

Build

$ git clone https://github.com/RBEGamer/pico-serprog.git ./pico-serprog
$ cd ./pico-serprog && cmake . && make

Usage

Program a flashchip with .bin file:

$ export FLASH_SIZE=16 #MByte
$ export DATA_TO_FLASH=testbitmap.bin # testimage.bin

# CREATE EMPTY IMAGE WITH SIZE OF THE FLASH CHIP
$ perl -e 'print "ff "x('${FLASH_SIZE}'*1024*1024)'| xxd -r -p > ${FLASH_SIZE}_data.bin
# ADD CONTENT TO IMAGE
$ dd if=$DATA_TO_FLASH of=${FLASH_SIZE}_data.bin conv=notrunc

# FINALLY FLASH IMAGE
$ flashrom -p serprog:dev=/dev/ttyACM0:115200,spispeed=12M -E -r ${FLASH_SIZE}_data.bin -V

License

The project is based on the spi_flash example by Raspberry Pi (Trading) Ltd. which is licensed under BSD-3-Clause.

As a lot of the code itself was heavily inspired/influenced by stm32-vserprog this code is licensed under GPLv3.