确定性双分区(A/B Bank)硬件原子回滚与安全看门狗互锁机制

通过硬件级分区切换、Flash存储写入物理隔离与 < 420 ms 极速状态回退，杜绝任何微控制器在升级过程中的变砖风险。

硬件引导计数器工作原理

当新固件在次分区(Bank B)写入完毕后，系统写入原子更新标志并重启。引导程序首先尝试引导 Bank B，若在通过诊断自检前触发看门狗超时、总线错误或系统崩溃，硬件计数器递减。一旦耗尽尝试次数，立即在微秒级内无缝切回经过严格验证的黄金分区(Bank A)。

Non-volatile boot attempt counter (decremented upon each reset until confirmed healthy)
Hardware memory protection unit (MPU) blocking write access to currently running partition
Sub-420 ms atomic pointer toggle in bootloader flash register
Automated self-diagnostic assertions prior to clearing rollback flags