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A comment on Raspberry Pi 4 can finally boot directly from USB. Parent comment

Re:Raspberry Pi 4 can finally boot directly from USB by LeoPanthera on Friday September 18, 2020 @04:25PM (#24521531)
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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Re:Raspberry Pi 4 can finally boot directly from USB by therealx on Friday September 18, 2020 @05:06PM (#24521885)
Very interesting it looks for the serial number and not the MAC address!
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Re:Raspberry Pi 4 can finally boot directly from USB by yjftsjthsd-h on Friday September 18, 2020 @06:39PM (#24522539)
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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