ARM Trusted Firmware

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Terminology

Source: [1]

EL0
Unprivileged (i.e. user space) runtime mode.
EL1
Standard OS (e.g. Linux) runtime mode.
EL3
"Secure world", trusted execution mode.
BL31
EL3 Runtime Firmware: AP_BL31
Also known as “SoC AP firmware” or “EL3 monitor firmware”. Its primary purpose is to handle transitions between the normal and secure world.
BL32
Secure-EL1 Payload (SP): AP_BL32
Typically this is a TEE or Trusted OS, providing runtime secure services to the normal world. However, it may refer to a more abstract Secure-EL1 Payload (SP).

External Links

  • Official website [2]
  • Official documentation [3]
    • Terminology [4]
  • Official source code repository [5]
  • Question on EL0/1/2/3 on ARMv8 [6]
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