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AM3359ZCZD72的nandflash烧写问题

Other Parts Discussed in Thread: AM3359

 我现在用的AM3359ZCZD72出现这样的问题,
当通过GPMC总线烧写nandflash时,写u-boot和内核都正常,烧完内核后通过串口看到系统也正常起来了。
当写文件系统时(文件系统内有一个15M大小的文件)会引起AM3359烧坏。
具体现象是,VDDSHV2的供电压已经由原来的3.3V,降到1.4V左右。当断开VDDSHV2的两个引脚原来3.3V的供电就正常了。
用万用表测VDDSHV2对地也没有短路。
请各位大侠帮我分析一下是什么问题。