This feature provides for run-time configuration of U-Boot
via a flattened device tree.
-config SPL_DISABLE_OF_CONTROL
- bool "Disable run-time configuration via Device Tree in SPL"
- depends on OF_CONTROL
+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
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.
+ 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"
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.
+
+config SPL_OF_PLATDATA
+ bool "Generate platform data for use in SPL"
+ depends on SPL_OF_CONTROL
+ help
+ For very constrained SPL environments the overhead of decoding
+ device tree nodes and converting their contents into platform data
+ is too large. This overhead includes libfdt code as well as the
+ device tree contents itself. The latter is fairly compact, but the
+ former can add 3KB or more to a Thumb 2 Image.
+
+ This option enables generation of platform data from the device
+ tree as C code. This code creates devices using U_BOOT_DEVICE()
+ declarations. The benefit is that it allows driver code to access
+ the platform data directly in C structures, avoidin the libfdt
+ overhead.
+
+ This option works by generating C structure declarations for each
+ compatible string, then adding platform data and U_BOOT_DEVICE
+ declarations for each node. See README.platdata for more
+ information.
+
endmenu