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程序的升级问题



我想做一个程序x,把程序x放在flash d 区,然后程序x 拷贝到flash a区,然后从flash a运行。如果要升级程序x1,就把升级的程序放在在flash a区运行;如果要还原程序,就把flash d 区的 x程序拷贝到flash a区。 谁能提供一个简单的例子,cmd文件怎么写?