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Universal Asynchronous Receiver/Transmitter (UART)

Interrupt types

SPI: Shared Peripheral Interrupt

PPI: Private Peripheral Interrupt

SGI: Software Generated Interrupt

LPI: Locality-specific Peripheral Interrupt

Peripheral -> { Interrupt Signal } -> Interrupt Controller -> { IRQ / FIQ } -> PE

Secure Group 0: Interrupt for EL3 (Secure Firmware)

Secure Group 1: Interrupt for EL1 (Trusted OS)

Non-secure Group 1: Interrupt for the Non-secure state (OS or Hypervisor)

FIQ: Firmware/Secure manager level (EL3)

IRQ: OS level

30 January 2021