Phase 2: Boot Setup - 2023.2 English

Versal Adaptive SoC System Software Developers Guide (UG1304)

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2023.2 English
Figure 1. Phase 2: Boot Setup
The RCU begins to execute the BootROM from the RCU ROM.
The BootROM reads the boot mode register to select the boot device.
The BootROM reads the PDI boot header in the boot device and validates it.
  • If the boot header is valid, the BootROM configures boot parameters based on the boot header data and continues the boot process.
  • If the boot header is not valid, the normal boot process changes to the fallback boot process.
The BootROM releases the reset to the PPU, and loads the PLM from the PDI into the PPU RAM and validates it. After validation, the PPU is woken up (at this point, the PLM software starts executing, refer to point 9 in Phase 3: Boot and Configuration sequence by PLM (Platform Loader).
The BootROM executable enters a sleep state. The BootROM executable continues to run until the next power-on-reset (POR) or system reset, and is responsible for post-boot platform tasks.