Custom Boot loader Development code for STM32.

[parth kothiya]

I want to develop my own boot loader for STM32 MCU so is there any resources or video or example code for how to do this?

[Imen.D]

Hello @parth kothiya​ ,

ST does not provide the Bootloader source code.

To develop/use code of Bootloader, you can use a similar package called OpenBootloader (OpenBL) that behaves exactly like the system bootloader and uses same interfaces but is open source code.

OpenBL supports only STM32G0 and STM32G4 series for the moment. So, you can customize it for other products series according to your needs.

\STM32Cube_FW_G4_V1.4.0\Middlewares\ST\OpenBootloader

\STM32Cube_FW_G4_V1.4.0\Projects\NUCLEO-G491RE\Applications\OpenBootloader

More information on OpenBL is available for example in USART protocol used in the STM32 bootloader (AN3155).

Note that ST OpenBL Wiki page link will be available soon.

Hope my answer helped you! :smiling_face_with_smiling_eyes:

When your question is answered, please close this topic by choosing "Select as Best". This will help other users find that answer faster.

Imen

[Osto]

Hi,

Is there any schedule for F7/H7 and M4 MCUs?

[Imen.D]

Hi @Osto​ ,

There is a plan for H7 in 21Q4, but there is no short term planning defined yet for STM32F7.

Imen

[Osto]

What you can use now are the IAP's (In Application Programmin). When you search on ST's website, you will find a lot of IAP's for different MCUs and different sources. They are easy to change for you purpose. Even when there is no IAP for your MCU or board, You can adapt them very easily.