arm-trusted-firmware 2.9.0+dfsg-3 (arm64 binary) in ubuntu mantic

 The "secure world" on arm64 machines is a special level of CPU
 privilege that is hidden from the normal OS, and has complete
 control over the system. It provides both initialization during
 early boot stages (before u-boot or EFI) and system monitor
 functionality once the machine is booted up.
 .
 This package includes the firmware binaries.