mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-05 20:54:31 +00:00
2789ddb9d5
Add a Kconfig option to enable this feature. Signed-off-by: Simon Glass <sjg@chromium.org>
109 lines
3.8 KiB
Text
109 lines
3.8 KiB
Text
#
|
|
# 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.
|
|
|
|
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
|