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DSP 5402偶尔上电长鸣问题

请求各位大神帮帮忙,我最近用的是基于 DSP 5402 芯片的 板子,用的是外部Flash存储;用了有一段时间了,但总不是那么顺利,偶尔有的板子会出现上电长鸣的问题,断电再上电就可以了,也找不出啥原因来、请大家帮忙分析分析啊    谢谢