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TMS570LC4357: 在CAN_Bootloader的文档中,关于在0x10000处的flag/magic word是什么?

Part Number: TMS570LC4357


你好:

    如题,这个flag的值是如何产生的?为什么会等于0x5A5A5A5A? 

    对于这一步flag的判断是必要的吗?还是只要观察GPIO的电平变化就可以判断是否需要进入更新程序?