secure-boot adds two new sub-directory to usbboot:
secure-boot-recovery is used to create an EEPROM signed with
the customer's RSA private key and configures the 2711 OTP
settings to permanently require signed boot images.
See secure-boot-recovery/README.md
Once secure-boot is enabled the CM4 MSD mode firmware must
also be signed with the customer's RSA private key.
See secure-boot-msd/README.md
secure-boot adds two new sub-directory to usbboot: