uboot needs to be modified to run a given operating system if it wasn't already supported (or a shim pretending to be one of the supported operating systems nee

uboot needs to be modified to run a given operating system if it wasn't already supported (or a shim pretending to be one of the supported operating systems needs to be used). UEFI provides a way to support all operating systems through a standardized interface. uboot implementing UEFI interface provides the best of both worlds.