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2 # Device Tree Control
22 menu "Device Tree Control"
26 bool "Run-time configuration via Device Tree"
30 via a flattened device tree.
33 bool "Board-specific manipulation of Device Tree"
36 U-Boot's device tree (e.g. to delete device from it). This option
37 make the Device Tree writeable and provides a board-specific
39 enables the board initialization to modifiy the Device Tree. The
43 bool "Enable run-time configuration via Device Tree in SPL"
46 Some boards use device tree in U-Boot but only have 4KB of SRAM
47 which is not enough to support device tree. Enable this option to
51 bool "Enable run-time configuration via Device Tree in TPL"
54 Some boards use device tree in U-Boot but only have 4KB of SRAM
55 which is not enough to support device tree. Enable this option to
59 bool "Enable use of a live tree"
62 Normally U-Boot uses a flat device tree which saves space and
63 avoids the need to unpack the tree before use. However a flat
64 tree does not support modification from within U-Boot since it
65 can invalidate driver-model device tree offsets. This option
66 enables a live tree which is available after relocation,
77 If this option is enabled, the device tree will be built and
83 If this option is enabled, the device tree will be picked up and
86 Boards in the mainline U-Boot tree should not use it.
92 If this option is enabled, the device tree will be provided by
107 If this option is enabled, the device tree used for DT
108 control will be read from a device tree binary, at a memory
114 string "Default Device Tree for DT control"
117 This option specifies the default Device Tree used for DT control.
119 $ make DEVICE_TREE=<device-tree-name>
122 string "List of device tree files to include for DT control"
126 This option specifies a list of device tree files to use for DT
130 device tree files (without the directory or .dtb suffix)
165 string "List of device tree files to include for DT control in SPL"
169 This option specifies a list of device tree files to use for DT
173 device tree files (without the directory or .dtb suffix)
235 string "List of device tree properties to drop for SPL"
242 Since SPL normally runs in a reduced memory space, the device tree
255 device tree nodes and converting their contents into platform data
257 device tree contents itself. The latter is fairly compact, but the
261 tree as C code. This code creates devices using U_BOOT_DEVICE()
276 device tree nodes and converting their contents into platform data
278 device tree contents itself. The latter is fairly compact, but the
282 tree as C code. This code creates devices using U_BOOT_DEVICE()