【Hardware information】

】Schematic

RP2350B-MINI-A.pdf

】Pin Definition

【Sample Code】

MicroPython-Code

rp2350-linux-Image

【How to run the example code】

】Run Python

1】Press Boot to enter firmware update mode. A U disk will appear on your computer.

2】Place firmware.uf2 on the newly displayed U disk. The U disk will automatically disappear after put it.

3】You can then run the *.py program using Thonny software.

】Burn and run Linux image

First, press and hold the BOOTSEL button on the Pico development board (keep it pressed), then plug the Pico into a USB port on your computer using a USB cable. Finally, release the BOOTSEL button. A disk named "RPI-RP2" will appear on your computer, similar to inserting a USB flash drive.

Install picotool on your Ubuntu Linux system.

Then use picotool in the Linux terminal to flash the firmware.。

psram-bootloader.uf2 is similar to a BIOS/boot loader. First, flash the uf2 file using the following command：

sudo picotool load -fu psram-bootloader.uf2

Then flash the Linux system image using the following command：

sudo picotool load -fxup 0 flash-image.bin

Use a USB-to-serial converter to connect UART-RX to GPIO0 on the Pico2 and UART-TX to GPIO1 on the Pico2.

Open the serial terminal to access the Linux terminal (this system is a minimal Linux system, builtroot, with kernel 6.10).

【Compile Linux source code】

】Clone the project to local

git clone https://github.com/Mr-Bossman/pi-pico2-linux

】Initialize and update the submodules within pico-sdk

git submodule update --init 

】Configure the system

make -C buildroot BR2_EXTERNAL=$PWD/ raspberrypi-pico2_defconfig

】Compile system

make -C buildroot

】Burning kernel

make -C psram-bootloader flash-kernel

(flash-kernel: is a target task defined in the Makefile in this directory, which contains specific burning commands)

】Verification System

Use the USB to serial port tool, connect UART-RX to GPIO0 of pico2, and connect UART-TX pin to GPIO1 of pico2.

Open the serial terminal and enter the Linux terminal.

Note: After flashing the Linux system, if you want to use micropython, you must first execute the following command to erase the firmware before it can be used normally:

sudo picotool erase

Otherwise, you will not be able to flash other uf2 files.