[U-Boot] Need suggestion on device driver project ideas

Hi, Currently I am pursuing my M.tech in embedded system. I would like to do my final academic project on Linux Device Driver. Please suggest some good areas/driver subsystem/feature that can be a good project. It can be on Uboot/boot-loader as well. Some of the areas that I had in my mind are GSM

[U-Boot] qemu and baremetal arm prog

For a Hello world uboot project I am using https://balau82.wordpress.com/2010/03/10/u-boot-for-arm-on-qemu/ tutorial. I have used GNU ARM toolchain Downloaded Uboot source : u-boot-2017.09 Compiled it make vexpress_ca9x4_defconfig ARCH=arm CROSS_COMPILE=../gcc-arm-none-eabi-6-2017-q2-update