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This comment from README.fdt-control did not end up in the Kconfig, which is what most people will see. Add it with a few tweaks. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Michal Simek <michal.simek@xilinx.com>
74 lines
2.3 KiB
Text
74 lines
2.3 KiB
Text
#
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# Device Tree Control
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#
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config SUPPORT_OF_CONTROL
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bool
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menu "Device Tree Control"
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depends on SUPPORT_OF_CONTROL
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config OF_CONTROL
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bool "Run-time configuration via Device Tree"
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help
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This feature provides for run-time configuration of U-Boot
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via a flattened device tree.
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config SPL_OF_CONTROL
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bool "Enable run-time configuration via Device Tree in SPL"
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depends on SPL && OF_CONTROL
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help
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Some boards use device tree in U-Boot but only have 4KB of SRAM
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which is not enough to support device tree. Enable this option to
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allow such boards to be supported by U-Boot SPL.
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choice
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prompt "Provider of DTB for DT control"
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depends on OF_CONTROL
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config OF_SEPARATE
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bool "Separate DTB for DT control"
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depends on !SANDBOX
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help
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If this option is enabled, the device tree will be built and
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placed as a separate u-boot.dtb file alongside the U-Boot image.
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config OF_EMBED
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bool "Embedded DTB for DT control"
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help
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If this option is enabled, the device tree will be picked up and
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built into the U-Boot image. This is suitable for local debugging
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and development only and is not recommended for production devices.
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Boards in the mainline U-Boot tree should not use it.
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config OF_HOSTFILE
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bool "Host filed DTB for DT control"
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depends on SANDBOX
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help
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If this option is enabled, DTB will be read from a file on startup.
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This is only useful for Sandbox. Use the -d flag to U-Boot to
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specify the file to read.
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endchoice
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config DEFAULT_DEVICE_TREE
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string "Default Device Tree for DT control"
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help
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This option specifies the default Device Tree used for DT control.
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It can be overridden from the command line:
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$ make DEVICE_TREE=<device-tree-name>
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config OF_SPL_REMOVE_PROPS
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string "List of device tree properties to drop for SPL"
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depends on SPL_OF_CONTROL
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default "clocks clock-names interrupt-parent" if SPL_PINCTRL_FULL
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default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent"
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help
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Since SPL normally runs in a reduced memory space, the device tree
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is cut down to only what is needed to load and start U-Boot. Only
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nodes marked with the property "u-boot,dm-pre-reloc" will be
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included. In addition, some properties are not used by U-Boot and
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can be discarded. This option defines the list of properties to
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discard.
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endmenu
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