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Linux/PROCESSOR-SDK-AM335X: the device tree of am335x-boneblack.dts

Part Number: PROCESSOR-SDK-AM335X

Tool/software: Linux

I am so strange about the  device tree in sdk version 03.02.00.05

why  the memory  both  of am335x-bone-common.dtsi and am335x-evm.dts  configured as following:

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

As I know ,beagle bone black and evm board  both are 512MB memory .Why?