Add dual-bank STM32 bootloader support #8778
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drashna
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noroadsleft
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… charge RC circuit.
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… charge RC circuit. (qmk#8778)
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Description
Adds support for STM32 dual-bank flash bootloaders, by toggling a GPIO during early init in order to charge an RC circuit attached to
BOOT0.The main rationale behind this is that dual-bank STM32 devices unconditionally execute user-mode code, regardless of whether or not the user-mode code jumps to the bootloader. If either flash bank is valid (and
BOOT0is low), then the built-in bootloader will skip any sort of DFU.This PR allows for the initialisation sequencing to charge the RC circuit based on the example circuit posted on Discord, effectively pulling
BOOT0high before issuing the system reset. As the RC circuit takes a while to discharge, the system reset executes the ROM bootloader which subsequently seesBOOT0high, and starts executing the DFU routines.Tested with STM32L082 (with current QMK+current ChibiOS), and STM32G474 (against ChibiOS 20.x).
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