1# 2# Device Tree Control 3# 4 5config SUPPORT_OF_CONTROL 6 bool 7 8menu "Device Tree Control" 9 depends on SUPPORT_OF_CONTROL 10 11config OF_CONTROL 12 bool "Run-time configuration via Device Tree" 13 help 14 This feature provides for run-time configuration of U-Boot 15 via a flattened device tree. 16 17config SPL_OF_CONTROL 18 bool "Enable run-time configuration via Device Tree in SPL" 19 depends on SPL && OF_CONTROL 20 help 21 Some boards use device tree in U-Boot but only have 4KB of SRAM 22 which is not enough to support device tree. Enable this option to 23 allow such boards to be supported by U-Boot SPL. 24 25choice 26 prompt "Provider of DTB for DT control" 27 depends on OF_CONTROL 28 29config OF_SEPARATE 30 bool "Separate DTB for DT control" 31 depends on !SANDBOX 32 help 33 If this option is enabled, the device tree will be built and 34 placed as a separate u-boot.dtb file alongside the U-Boot image. 35 36config OF_EMBED 37 bool "Embedded DTB for DT control" 38 help 39 If this option is enabled, the device tree will be picked up and 40 built into the U-Boot image. This is suitable for local debugging 41 and development only and is not recommended for production devices. 42 Boards in the mainline U-Boot tree should not use it. 43 44config OF_HOSTFILE 45 bool "Host filed DTB for DT control" 46 depends on SANDBOX 47 help 48 If this option is enabled, DTB will be read from a file on startup. 49 This is only useful for Sandbox. Use the -d flag to U-Boot to 50 specify the file to read. 51 52endchoice 53 54config DEFAULT_DEVICE_TREE 55 string "Default Device Tree for DT control" 56 depends on OF_CONTROL 57 help 58 This option specifies the default Device Tree used for DT control. 59 It can be overridden from the command line: 60 $ make DEVICE_TREE=<device-tree-name> 61 62config OF_LIST 63 string "List of device tree files to include for DT control" 64 depends on SPL_LOAD_FIT 65 default DEFAULT_DEVICE_TREE 66 help 67 This option specifies a list of device tree files to use for DT 68 control. These will be packaged into a FIT. At run-time, SPL will 69 select the correct DT to use by examining the hardware (e.g. 70 reading a board ID value). This is a list of device tree files 71 (without the directory or .dtb suffix) separated by <space>. 72 73config OF_SPL_REMOVE_PROPS 74 string "List of device tree properties to drop for SPL" 75 depends on SPL_OF_CONTROL 76 default "interrupt-parent" if SPL_PINCTRL_FULL && SPL_CLK 77 default "clocks clock-names interrupt-parent" if SPL_PINCTRL_FULL 78 default "pinctrl-0 pinctrl-names interrupt-parent" if SPL_CLK 79 default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent" 80 help 81 Since SPL normally runs in a reduced memory space, the device tree 82 is cut down to only what is needed to load and start U-Boot. Only 83 nodes marked with the property "u-boot,dm-pre-reloc" will be 84 included. In addition, some properties are not used by U-Boot and 85 can be discarded. This option defines the list of properties to 86 discard. 87 88endmenu 89