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The secure-boot-example/boot.img has been replaced with the mass-storage-gadget Linux OS image because it already supported login, hdmi and ethernet.
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Replace the example boot.img with a slightly more useful version 64-bit version that boots to a minimal busybox initrd with USB enabled.
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Add some more detail about the RSA signatures. Tweak update-pieeprom.sh so add a separate argument for the public key in order to make it easier to customize the script for hardware security modules.