kbeckmann
commented
3 years ago Great! I’d also like to add that one can use flashapp for the extflash, and a patched openocd to access all 256kB of bank 1 and the extra 256kB of bank 2. So it should be possible to perform all the steps with open tools (except for the patching of the original firmware)
The openocd-builder repo provides a deb file and the patch is here https://github.com/kbeckmann/ubuntu-openocd-git-builder/blob/master/0001-Extend-bank1-and-enable-bank2-of-STM32H7B0VBTx.patch
Basically allows the internal flash bank to be selectable and updates the readme with a more advanced flashing example.