Worked on the zephyrproject-rtos/zephyr repository to improve reliability and performance of the STM32 OSPI driver for memory-mapped flash access. Addressed a bug where concurrent operation of OSPI1 and OSPI2 could cause indefinite chip select assertion by implementing a memory-mapped timeout fix, aligning with STM32 device errata recommendations. Enhanced the driver to support multi-OSPI operation under shared IO and clock lines, updated debug logging for better diagnostics, and clarified DQS port configuration to match STM32 HAL conventions. Utilized C programming and embedded systems expertise to deliver measurable stability improvements for memory-mapped workloads in device driver development contexts.