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C6657 SPI NOR BOOT问题

使用自己开发的C6557板卡,SPI NOR BOOT方式加载失败,boot mode设置通过查看寄存器正确为0x4D,加载时使用示波器测量SPI 时钟稳定为506KHz,但SPI FLASH的DQ1引脚一直没有数据输出,一直未低电平,不知道为何?