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#
# 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
default DEFAULT_DEVICE_TREE
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
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