1783e6a72SMasahiro Yamada# 2783e6a72SMasahiro Yamada# Device Tree Control 3783e6a72SMasahiro Yamada# 4783e6a72SMasahiro Yamada 5783e6a72SMasahiro Yamadaconfig SUPPORT_OF_CONTROL 6783e6a72SMasahiro Yamada bool 7783e6a72SMasahiro Yamada 8783e6a72SMasahiro Yamadamenu "Device Tree Control" 9783e6a72SMasahiro Yamada depends on SUPPORT_OF_CONTROL 10783e6a72SMasahiro Yamada 11783e6a72SMasahiro Yamadaconfig OF_CONTROL 12783e6a72SMasahiro Yamada bool "Run-time configuration via Device Tree" 13783e6a72SMasahiro Yamada help 14783e6a72SMasahiro Yamada This feature provides for run-time configuration of U-Boot 15783e6a72SMasahiro Yamada via a flattened device tree. 16783e6a72SMasahiro Yamada 17*dffb86e4SMasahiro Yamadaconfig SPL_OF_CONTROL 18*dffb86e4SMasahiro Yamada bool "Enable run-time configuration via Device Tree in SPL" 19*dffb86e4SMasahiro Yamada depends on SPL && OF_CONTROL 202860f03bSSimon Glass help 212860f03bSSimon Glass Some boards use device tree in U-Boot but only have 4KB of SRAM 222860f03bSSimon Glass which is not enough to support device tree. Enable this option to 232860f03bSSimon Glass allow such boards to be supported by U-Boot SPL. 242860f03bSSimon Glass 25783e6a72SMasahiro Yamadachoice 26783e6a72SMasahiro Yamada prompt "Provider of DTB for DT control" 27783e6a72SMasahiro Yamada depends on OF_CONTROL 28783e6a72SMasahiro Yamada 29783e6a72SMasahiro Yamadaconfig OF_SEPARATE 30783e6a72SMasahiro Yamada bool "Separate DTB for DT control" 31783e6a72SMasahiro Yamada depends on !SANDBOX 32783e6a72SMasahiro Yamada help 33783e6a72SMasahiro Yamada If this option is enabled, the device tree will be built and 34783e6a72SMasahiro Yamada placed as a separate u-boot.dtb file alongside the U-Boot image. 35783e6a72SMasahiro Yamada 36783e6a72SMasahiro Yamadaconfig OF_EMBED 37783e6a72SMasahiro Yamada bool "Embedded DTB for DT control" 38783e6a72SMasahiro Yamada help 39783e6a72SMasahiro Yamada If this option is enabled, the device tree will be picked up and 40783e6a72SMasahiro Yamada built into the U-Boot image. 41783e6a72SMasahiro Yamada 42783e6a72SMasahiro Yamadaconfig OF_HOSTFILE 43783e6a72SMasahiro Yamada bool "Host filed DTB for DT control" 44783e6a72SMasahiro Yamada depends on SANDBOX 45783e6a72SMasahiro Yamada help 46783e6a72SMasahiro Yamada If this option is enabled, DTB will be read from a file on startup. 47783e6a72SMasahiro Yamada This is only useful for Sandbox. Use the -d flag to U-Boot to 48783e6a72SMasahiro Yamada specify the file to read. 49783e6a72SMasahiro Yamada 50783e6a72SMasahiro Yamadaendchoice 51783e6a72SMasahiro Yamada 52f1ef2b62SMasahiro Yamadaconfig DEFAULT_DEVICE_TREE 53f1ef2b62SMasahiro Yamada string "Default Device Tree for DT control" 54f1ef2b62SMasahiro Yamada help 55f1ef2b62SMasahiro Yamada This option specifies the default Device Tree used for DT control. 565699ea6dSRobert P. J. Day It can be overridden from the command line: 57f1ef2b62SMasahiro Yamada $ make DEVICE_TREE=<device-tree-name> 58f1ef2b62SMasahiro Yamada 59fa78e0a3SSimon Glassconfig OF_SPL_REMOVE_PROPS 60fa78e0a3SSimon Glass string "List of device tree properties to drop for SPL" 61fa78e0a3SSimon Glass depends on OF_CONTROL && SPL 62fa78e0a3SSimon Glass default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent" 63fa78e0a3SSimon Glass help 64fa78e0a3SSimon Glass Since SPL normally runs in a reduced memory space, the device tree 65fa78e0a3SSimon Glass is cut down to only what is needed to load and start U-Boot. Only 66fa78e0a3SSimon Glass nodes marked with the property "u-boot,dm-pre-reloc" will be 67fa78e0a3SSimon Glass included. In addition, some properties are not used by U-Boot and 68fa78e0a3SSimon Glass can be discarded. This option defines the list of properties to 69fa78e0a3SSimon Glass discard. 70fa78e0a3SSimon Glass 71783e6a72SMasahiro Yamadaendmenu 72