Custom bootloader for dual-core STM32H745ZI

[Jack3]

I made custom bootloaders for STM32F7 and SM32H7, so I'm a bit familiar with the process to update an application when using a bootloader.

But how does one make a bootloader for a Dual-Core STM32H7?

I think it goes like this.

If I use the CM4 core for the bootloader:

• CM4 bootloader checks SD card for updates (binary files)
• CM4 bootloader checks MD5 checksums of the binary files
• CM4 bootloader halts CM7 core
• CM4 bootloader erases FLASH for application for CM4 core
• CM4 bootloader programs FLASH for application for CM4 core
• CM4 bootloader checks FLASH for application for CM4 core
• CM4 bootloader erases FLASH for application for CM7 core
• CM4 bootloader programs FLASH for application for CM7 core
• CM4 bootloader checks FLASH for application for CM7 core
• CM4 hands execution over to application for CM4 core
• Application in the CM4 core starts the CM7 core (the CM7 core does not need a handover)

Is this a good way to do this?

[KWest.1]

Did you ever get this working? i have a very similar question.

[smati2]

Hi Jack, is the custom bootloader you have made for the STM32H7 something you can share?

FYI, as I see it, there are Open source bootloaders out there but on the STM32, they are mostly for other versions of STM32 and not for the STM32H7xx. The flash operation is a bit different and I was wondering since you have gone through the trouble of making your custom bootloader for STM32H7, if you can share it and save time at my end. Thank you.

[PHayw.1]

I'd also be interested please