FYI: rpi3 can boot from USB Mass Storage Device

[Mark Millard]

The following gives instructions for a raspbian context for enabling "USB boot mode" on an rpi3:

https://github.com/raspberrypi/documentation/blob/master/hardware/raspberrypi/bootmodes/msd.md

Getting the "OTP" programmed to enable the mode is done via a SD card boot but after that a USB storage device can be used instead.

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Mark Millard
markmi at dsl-only.net