@startuml
!theme cloudscape-design
start
:**Firmware**;
note right
  Implement a subset of the UEFI specification
  Usually implemented by u-boot
end note
:**Bootloader**
efibootguard;
note right
  The bootloader is responsible to find and load the Operating System
  It's an UEFI application that can be signed
end note
:**Operating System**
Unified Kernel Image;
note right
  The Operating System is a single UEFI application that can be signed
  This application has to call the ExitBootService UEFI protocol
  This application contains at least the Linux Kernel
end note
end
@enduml