The videocore portion of the raspberry pi which boots the arm cores and

runs the mailbox interface knows about a MAC address that appears to be
derived from a unique serial number along with the raspberry pi
foundation oui.

It modifies the device tree when booting to store the MAC address
in /axi/usb/hub/ethernet/mac-address so fetch and use this value
for the integrated smsc(4) Ethernet.

A different smsc adapter plugged into one of the USB ports
probes later with a different unit number and skips this path.

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