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 && SPL_DM 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. config TPL_RAM bool "Enable RAM support in TPL" depends on RAM && TPL_DM 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 TPL, enable this option. It might provide a cleaner interface to setting up RAM (e.g. SDRAM / DDR) within TPL. config STM32_SDRAM bool "Enable STM32 SDRAM support" depends on RAM help STM32F7 family devices support flexible memory controller(FMC) to support external memories like sdram, psram & nand. This driver is for the sdram memory interface with the FMC. config MPC83XX_SDRAM bool "Enable MPC83XX SDRAM support" depends on RAM help Enable support for the internal DDR Memory Controller of the MPC83xx family of SoCs. Both static configurations, as well as configuring the RAM through the use of SPD (Serial Presence Detect) is supported via device tree settings. source "drivers/ram/stm32mp1/Kconfig"