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6674 spi boot load失败



程序(进过在线调试验证运行没有问题)已经按照direct boot教程烧写进nor flash(显示successful)

首先devstat寄存器数值为940D,是spi boot的模式

boot magic寄存器数值为0

各个核的boot addr均为20b00001

用示波器观察spi时钟,频率确实是500khz,但是只有很少的几组时钟,观察spi数据线miso也只有很短一段数据(基本没有)。请问专家这是什么原因导致我的boot失败?