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by adrian_b 1412 days ago
The memory is already mapped by the BIOS/EFI firmware, before the kernel takes control.

By default, whenever the memory modules used in all different channels have the same size, e.g. two 8 GB modules, the firmware maps the modules with interleaved addresses, to ensure a double throughput for 2 channels, or triple/quadruple/etc. for workstation/server motherboards with more memory channels.