Determining the first memory address

I'm working on a project to extract a key from memory. So i want to know the first memory address. For that i have samsung galaxy S7 with ARM processor ARMv8-A.I have taken a look at its kernel and i found following:

#include "exynos8890.dtsi"

{
memory@80000000 {
    device_type = "memory";

    reg = <0x0 0x80000000 0x80000000>;
};
memory@880000000 {
    device_type = "memory";

    reg = <0x00000008 0x80000000 0x80000000>;
};

Does indicate the address 0x80000000 to the first memory address?