# # Device Tree Control # config SUPPORT_OF_CONTROL bool menu "Device Tree Control" depends on SUPPORT_OF_CONTROL config OF_CONTROL bool "Run-time configuration via Device Tree" help This feature provides for run-time configuration of U-Boot via a flattened device tree. config SPL_OF_CONTROL bool "Enable run-time configuration via Device Tree in SPL" depends on SPL && OF_CONTROL help Some boards use device tree in U-Boot but only have 4KB of SRAM which is not enough to support device tree. Enable this option to allow such boards to be supported by U-Boot SPL. choice prompt "Provider of DTB for DT control" depends on OF_CONTROL config OF_SEPARATE bool "Separate DTB for DT control" depends on !SANDBOX help If this option is enabled, the device tree will be built and placed as a separate u-boot.dtb file alongside the U-Boot image. config OF_EMBED bool "Embedded DTB for DT control" help If this option is enabled, the device tree will be picked up and built into the U-Boot image. This is suitable for local debugging and development only and is not recommended for production devices. Boards in the mainline U-Boot tree should not use it. config OF_HOSTFILE bool "Host filed DTB for DT control" depends on SANDBOX help If this option is enabled, DTB will be read from a file on startup. This is only useful for Sandbox. Use the -d flag to U-Boot to specify the file to read. endchoice config DEFAULT_DEVICE_TREE string "Default Device Tree for DT control" depends on OF_CONTROL help This option specifies the default Device Tree used for DT control. It can be overridden from the command line: $ make DEVICE_TREE=<device-tree-name> config OF_LIST string "List of device tree files to include for DT control" depends on SPL_LOAD_FIT help This option specifies a list of device tree files to use for DT control. These will be packaged into a FIT. At run-time, SPL will select the correct DT to use by examining the hardware (e.g. reading a board ID value). This is a list of device tree files (without the directory or .dtb suffix) separated by <space>. config OF_SPL_REMOVE_PROPS string "List of device tree properties to drop for SPL" depends on SPL_OF_CONTROL default "interrupt-parent" if SPL_PINCTRL_FULL && SPL_CLK default "clocks clock-names interrupt-parent" if SPL_PINCTRL_FULL default "pinctrl-0 pinctrl-names interrupt-parent" if SPL_CLK default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent" help Since SPL normally runs in a reduced memory space, the device tree is cut down to only what is needed to load and start U-Boot. Only nodes marked with the property "u-boot,dm-pre-reloc" will be included. In addition, some properties are not used by U-Boot and can be discarded. This option defines the list of properties to discard. endmenu