Worked on the renesas/zephyr repository to enhance DMA performance, reliability, and configurability within embedded systems. Focused on improving cache coherence by adding AXI cache configuration and introducing CCU-aware optimizations, which reduce unnecessary cache flushes when a cache-coherent interconnect is present. Strengthened multi-core safety in the DMA driver by replacing non-atomic channel state with atomic operations, ensuring correct behavior under SMP. Improved code maintainability by abstracting reset property checks and updating variable types. Leveraged C programming and device driver development expertise to introduce device-tree driven limits, making validation easier and increasing robustness for DMA operations in embedded environments.