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你好,
请先检查一下DDR1未使用的pins脚是否有按datasheet的要求进行配置,比如DQS的差分信号是否有上拉/下拉等。另外还需要根据你的具体外部DDR内存,修改uboot中DMM_LISA_MAP_0~3寄存器。可以参考下面的链接:
http://e2e.ti.com/support/embedded/linux/f/354/p/187489/675821.aspx#675821
http://e2e.ti.com/support/embedded/linux/f/354/t/141187.aspx#509295