jsanchez-2g opened a new pull request, #20060:
URL: https://github.com/apache/nuttx/pull/20060
## Summary
Add STM32G0 flash APIs required to switch dual-bank memory mapping and reload
flash option bytes:
- `stm32_flash_swapbanks()` toggles `FLASH_OPTR_NSWAP_BANK`
- `stm32_flash_optload()` launches an option-byte reload
- Bank swapping returns `-EPERM` when `FLASH_SECR_BOOT_LOCK` is active
- The swap operation is a no-op on single-bank devices
Reloading option bytes after changing the bank mapping normally causes an
immediate system reset.
## Validation
- `git diff --check`: passed
- `tools/checkpatch.sh -g HEAD^..HEAD`: passed
- STM32G071 single-bank configuration with `CONFIG_STM32_PROGMEM=y`:
- Flash driver compiled successfully
- Both APIs exported
- Single-bank no-op path compiled
- STM32G0B1 dual-bank configuration with `CONFIG_STM32_PROGMEM=y`:
- Flash driver compiled successfully
- Both APIs exported
- Dual-bank swap path compiled
## Hardware validation
Tested the equivalent existing implementation on a 2G BMS Golgi STM32G0B1
target using two consecutive RS-485 firmware updates.
Observed option-byte states:
1. Initial USB DFU image:
- `FLASH_OPTR=fef9feaa`
- `nSWAP_BANK=1`
2. After the first firmware update:
- `FLASH_OPTR=fee9feaa`
- `nSWAP_BANK=0`
3. After the second update, initiated while the banks were swapped:
- `FLASH_OPTR=fef9feaa`
- `nSWAP_BANK=1`
Both updates completed successfully. After each update, the target rebooted,
mounted its filesystem, initialized its communication interfaces and BMS
hardware, and resumed normal operation.
The hardware image used the product-tree implementation from which these APIs
were ported. The submitted code was rebased and compile-validated against
current Apache NuttX master.
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