STM32 UART/SPI bootload STM32G474 with raspberry pi CM5

Spam4tea · ‎2025-11-27

Hello - I have a product I am commercially developing for a company - an industrial sensor system - STYM32G474 x 8 - using them for their very fast ADC - all good so far. I am using a SPI bus to get all the data back to as Linux SBC (pi CM5 for now - might change next year - needs 2 cameras and NVME).

I would like to update all the STM32G474 over UART (for now) then over to SPI for production - using the raspberry pi cm5.

Is there an open source C++ / python program that can do this from ST? - something like the old "https://github.com/stm32duino/stm32flash" but supports the newer chips? perhaps OpenOCD would work but that is even more connectors etc.

Andrew Neil · ‎2025-11-27

@Spam4tea wrote:
Is there an open source C++ / python program that can do this from ST?

I don't know, but the protocols are documented:

AN3155, USART protocol used in the STM32 bootloader

AN4286, SPI protocol used in the STM32 bootloader

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

mƎALLEm · ‎2025-11-27

Hello,

@Spam4tea wrote:

Is there an open source C++ / python program that can do this from ST?

To my knowledge there is no open source HOST bootloader made by ST.

As stated by @Andrew Neil you need to develop your own Host bootloader based on the ST bootloader specifications described in the provided application notes.

Yu can also inspire from other developers work:

https://github.com/glegrain/STM32-SPI-Bootloader-host

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