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Netboot instructions are here: https://www.raspberrypi.org/documentation/hardware/raspberry...

The important bit is that it will look for its boot files in a subdirectory named the serial number of the Pi. Only if that fails will it look in the root.

So I have symlinks for the serial numbers of all my Pis that point to whatever OS I want to boot.

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Very interesting it looks for the serial number and not the MAC address!

Pretty sure that's because the pi doesn't actually have a hardcoded MAC; I think I've read that it's just set in software and persisted by the OS, which is weird but workable right up until there is no local storage to persist on.

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