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c6657 nand boot

c6657 nand直接加载方式,加载失败,单步跟踪,发现boot程序一直在PCIE_SERDES_STS寄存器这循环,这个寄存器在0x30c和0x304之间切换,我们自己开发的板卡没有使用PCIE接口,时钟按照手册中接到了固定状态,P端接高,N端接地,PCIE链路差分信号全部断开。加载失败不知道与PCIE设置有关系吗。在开发板上是验证成功的。