Worked on the flipperdevices/u-boot repository to address a critical issue in MMC device-tree parsing, focusing on embedded systems and Linux kernel development. Delivered a targeted fix in C that ensures the eMMC bus width is correctly initialized to 8-bit by parsing generic MMC device-tree properties before configuration setup. This approach involved integrating mmc_of_parse() ahead of sdhci_setup_cfg(), allowing device-tree values to be accurately reflected in the host configuration. The solution improved the correctness and reliability of the MMC subsystem, as verified on the Raspberry Pi Compute Module 4, and demonstrated skills in device driver development and hardware-level debugging.