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关于AM335X的DDR容量配置的问题

大家好,我的板子是AM335X,SDK版本是ti-processor-sdk-linux-am335x-evm-03.02.00.05,现在使用的256MB的DDR,我能不把RAM控强制为128MB呢?因为现在想测试一个应用在128MB内存下的性能,如果可以应该怎么弄呢?在dts文件把下面这个地方改了好像没用:

memory {
device_type = "memory";
reg = <0x80000000 0x10000000>; /* 256 MB */
};

然后使用bootargs传递mem=128M后内核根本起不来!