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SPI加载偶尔加载不上

我在调试6678的时候,遇到了6678偶尔加载不上的情况,采用SPI加载模式,BOOTMODE已确认设置正确,但故障时监测到DSP没有从SPI flash读数(DSP的SPI_DOUT、SPI_CLK均无读信号),还有一个现象是故障时CORE_PLL=0,正常情况下CORE_PLL=1,故障时和正常情况下DDR3_PLL和PASS_PLL均为1,请问这种不加载的现象可能是什么方面的原因呢?