Engine stops on burn, even for dual bank devices

STM32H743 is dual bank, and you should be able to execute from one bank while erasing/writing the other.

But sometimes, you push burn and the engine dies because the ECU was locked up for ~1 second. What's up with that?

Start by reproducing a burn on an STM32H743 dual-bank device while the engine is running, focusing on the reported approximately one-second ECU lockup. Trace the burn and erase/write path to determine why execution does not continue from the other bank; done means burning no longer stops the engine.

Written by the indexing model from the issue text.