关于远程升级的问题

目前我正在做一个tm4c1294单片机远程升级的功能，功能上已经能正常升级了，但是使用测试连续升级几十次升级总是会出现死机情况，断电重启后又能正常工作，请问有可能是什么原因导致的，同时我参考usb_stick_update的范例程序，里面的烧录flash是将最初的8字节数据留到最后再写入，请问这么做有什么特别的用处吗？因为我是直接从头写入

Susan Yang：

在程序中有说明

// In order to prevent a partially programmed imaged (due to some// error occurring while programming), the first two locations are// not programmed until all of the rest of the image has been// successfully loaded into the flash.This way if there is some error,// the updater will detect that a user application is not present and// will not attempt to run it.//// For the first block, do not program the first two word locations// (8 bytes).These two words will be programmed later, after// everything else.

主要是因为若是前8 bytes不写的话，期间如果出现一些错误,更新程序将检测到用户应用程序不存在,并且不会尝试运行它。