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#
# Device Tree Control
#
config SUPPORT_OF_CONTROL
bool
config DTC
bool
config PYLIBFDT
bool
config DTOC
bool
select PYLIBFDT
config BINMAN
bool
select DTOC
menu "Device Tree Control"
depends on SUPPORT_OF_CONTROL
config OF_CONTROL
bool "Run-time configuration via Device Tree"
select DTC
help
This feature provides for run-time configuration of U-Boot
via a flattened device tree.
config OF_BOARD_FIXUP
bool "Board-specific manipulation of Device Tree"
help
In certain circumstances it is necessary to be able to modify
U-Boot's device tree (e.g. to delete device from it). This option
make the Device Tree writeable and provides a board-specific
"board_fix_fdt" callback (called during pre-relocation time), which
enables the board initialization to modifiy the Device Tree. The
modified copy is subsequently used by U-Boot after relocation.
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.
config TPL_OF_CONTROL
bool "Enable run-time configuration via Device Tree in TPL"
depends on TPL && 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 TPL.
config OF_LIVE
bool "Enable use of a live tree"
depends on OF_CONTROL
help
Normally U-Boot uses a flat device tree which saves space and
avoids the need to unpack the tree before use. However a flat
tree does not support modifcation from within U-Boot since it
can invalidate driver-model device tree offsets. This option
enables a live tree which is available after relocation,
and can be adjusted as needed.
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_BOARD
bool "Provided by the board at runtime"
depends on !SANDBOX
help
If this option is enabled, the device tree will be provided by
the board at runtime if the board supports it, instead of being
bundled with the image.
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 || MULTI_DTB_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, U-boot
or 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 DTB_RESELECT
bool "Support swapping dtbs at a later point in boot"
depends on MULTI_DTB_FIT
help
It is possible during initial boot you may need to use a generic
dtb until you can fully determine the board your running on. This
config allows boards to implement a function at a later point
during boot to switch to the "correct" dtb.
config MULTI_DTB_FIT
bool "Support embedding several DTBs in a FIT image for u-boot"
help
This option provides hooks to allow U-boot to parse an
appended FIT image and enable board specific code to then select
the correct DTB to be used. Use this if you need to support
multiple DTBs but don't use the SPL.
config SPL_MULTI_DTB_FIT
depends on SPL_LOAD_FIT && SPL_OF_CONTROL && !SPL_OF_PLATDATA
bool "Support embedding several DTBs in a FIT image for the SPL"
help
This option provides the SPL with the ability to select its own
DTB at runtime from an appended FIT image containing several DTBs.
This allows using the same SPL binary on multiple platforms.
The primary purpose is to handle different versions of
the same platform without tweaking the platform code if the
differences can be expressed in the DTBs (common examples are: bus
capabilities, pad configurations).
config SPL_OF_LIST
string "List of device tree files to include for DT control in SPL"
depends on SPL_MULTI_DTB_FIT
default OF_LIST
help
This option specifies a list of device tree files to use for DT
control in the SPL. These will be packaged into a FIT. At run-time,
the 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>.
choice
prompt "SPL OF LIST compression"
depends on SPL_MULTI_DTB_FIT
default SPL_MULTI_DTB_FIT_LZO
config SPL_MULTI_DTB_FIT_LZO
bool "LZO"
depends on SYS_MALLOC_F
select SPL_LZO
help
Compress the FIT image containing the DTBs available for the SPL
using LZO compression. (requires lzop on host).
config SPL_MULTI_DTB_FIT_GZIP
bool "GZIP"
depends on SYS_MALLOC_F
select SPL_GZIP
help
Compress the FIT image containing the DTBs available for the SPL
using GZIP compression. (requires gzip on host)
config SPL_MULTI_DTB_FIT_NO_COMPRESSION
bool "No compression"
help
Do not compress the FIT image containing the DTBs available for the SPL.
Use this options only if LZO is not available and the DTBs are very small.
endchoice
choice
prompt "Location of uncompressed DTBs "
depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
default SPL_MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
config SPL_MULTI_DTB_FIT_DYN_ALLOC
bool "Dynamically allocate the memory"
depends on SYS_MALLOC_F
config SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
bool "User-defined location"
endchoice
config SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ
hex "Size of memory reserved to uncompress the DTBs"
depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
default 0x8000
help
This is the size of this area where the DTBs are uncompressed.
If this area is dynamically allocated, make sure that
SPL_SYS_MALLOC_F_LEN is big enough to contain it.
config SPL_MULTI_DTB_FIT_USER_DEF_ADDR
hex "Address of memory where dtbs are uncompressed"
depends on SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
help
the FIT image containing the DTBs is uncompressed in an area defined
at compilation time. This is the address of this area. It must be
aligned on 2-byte boundary.
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 && SPL_CLK
default "clocks clock-names interrupt-parent" if SPL_PINCTRL
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
select DTOC
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.
config TPL_OF_PLATDATA
bool "Generate platform data for use in TPL"
depends on TPL_OF_CONTROL
select DTOC
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
config MKIMAGE_DTC_PATH
string "Path to dtc binary for use within mkimage"
default "dtc"
help
The mkimage host tool will, in order to generate FIT images make
calls to the dtc application in order to create the output. In
some cases the system dtc may not support all required features
and the path to a different version should be given here.
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