jsanchez-2g opened a new pull request, #20054:
URL: https://github.com/apache/nuttx/pull/20054
## Summary
Fix STM32G0 flash erase-bank selection when the flash banks are swapped.
Flash page numbers follow the logical memory mapping, while the FLASH_CR
BKER bit selects a physical flash bank. When nSWAP_BANK is cleared, the
physical banks are reversed in the memory map, so BKER must also be
reversed when erasing a logical address.
## Validation
- `git diff --check`: passed
- `tools/checkpatch.sh -g HEAD^..HEAD`: passed
- Built `stm32_flash_m0_g0c0.c` for STM32G0B1 with
`CONFIG_STM32_PROGMEM=y`
- Hardware tested on a 2G BMS Golgi board using two consecutive
RS-485 firmware updates:
- Initial state: `FLASH_OPTR=fef9feaa`, nSWAP_BANK set
- After update 1: `FLASH_OPTR=fee9feaa`, nSWAP_BANK cleared
- Update 2 was initiated while the banks were swapped
- After update 2: `FLASH_OPTR=fef9feaa`, nSWAP_BANK set
- Both updates completed, rebooted into the programmed image, mounted
the filesystem, initialized communications and BMS hardware, and
operated normally
The hardware image used the existing product-tree version of the same
bank-selection correction. The submitted implementation ports that
logic to the current common STM32 flash driver.
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