config RAM bool "Enable RAM drivers using Driver Model" depends on DM help This allows drivers to be provided for SDRAM and other RAM controllers and their type to be specified in the board's device tree. Generally some parameters are required to set up the RAM and the RAM size can either be statically defined or dynamically detected. config SPL_RAM bool "Enable RAM support in SPL" depends on RAM help The RAM subsystem adds a small amount of overhead to the image. If this is acceptable and you have a need to use RAM drivers in SPL, enable this option. It might provide a cleaner interface to setting up RAM (e.g. SDRAM / DDR) within SPL.