Worked on the zephyrproject-rtos/trusted-firmware-a repository to deliver SPEFDS support, enabling access to the PMSDSFR_EL1 register and updating the SPE enable and disable logic to accommodate the FEAT_SPE_FDS hardware feature. This enhancement ensures proper operation at NS-EL1 and NS-EL2 privilege levels when the feature is present, supporting secure and flexible SPE control on capable ARM platforms. The work involved low-level system programming in C, direct ARM register manipulation, and integration with embedded systems workflows. No major bugs were reported or fixed during this period, with efforts focused on strengthening hardware compatibility and future platform support in trusted firmware.