MT7621，如果内存为512MB，设备DTS文件中，下面这种写法会导致编译出来的固件无法运行
memory@0 {
device_type = "memory";
reg = <0x0 0x20000000>;
};
device_type = "memory";
reg = <0x0 0x20000000>;
};
正确写法如下
memory@0 {
device_type = "memory";
reg = <0x0 0x1c000000>, <0x20000000 0x4000000>;
};
device_type = "memory";
reg = <0x0 0x1c000000>, <0x20000000 0x4000000>;
};