Non-Secure Boot Flow - 2020.2 English

Versal ACAP System Software Developers Guide (UG1304)

Document ID
Release Date
2020.2 English

The following figure illustrates an example boot and configuration sequence and shows how the PLM loads the major partition components of the Versal ACAP software stack.

Figure 1. Example Standard Boot Flow Processing Engines and Memory Sources

In non-secure boot mode, BootROM loads PLM into PPU RAM and releases the PPU to begin PLM execution.. PLM continues loading of the images from PDI. In the above boot flow example, PLM initializes LPD, FPD and DDR through CDO files. As a part of LPD image, PLM loads and starts PSM Firmware. PLM loads PL CFI through RCDO file. PLM loads ATF, U-Boot and starts ATF (EL3-S) on APU. ATF starts U-Boot (EL2-NS). U-Boot then loads Linux and hand-off to it. PLM can also load and start RPU and AI Engine images.

Note: In symmetric multi-processing (SMP) mode, the OS manages the multiple Cortex-A72 processors.