Worked on the zephyrproject-rtos/trusted-firmware-a repository to address a critical issue in PMUv3 context-aware initialization for ARM-based embedded systems. Focused on firmware development in C, the work involved moving PMUv3 enablement into common context management initialization to ensure that MDCR_EL3 is correctly configured during context switches across all security worlds. This approach stabilized cross-world security context transitions and reduced the risk of misconfiguration during world changes. By aligning MDCR_EL3 handling with per-world requirements, the update improved platform integrity and reliability, enhancing the overall workflow for trusted firmware and supporting robust embedded system security practices.