mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 05:42:58 +00:00
2f57c95100
u-boot can be embedded within a FIT image with multiple DTBs. It then selects at run-time which one is best suited for the platform. Use the same principle here for the SPL: put the DTBs in a FIT image, compress it (LZO, GZIP, or no compression) and append it at the end of the SPL. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> [trini: Move default y of SPL_MULTI_DTB_FIT_DYN_ALLOC to it being the default choice if SYS_MALLOC_F, drop spl.h include from lib/fdtdec.c it's unused.] Signed-off-by Tom Rini <trini@konsulko.com>
282 lines
10 KiB
Text
282 lines
10 KiB
Text
#
|
|
# Device Tree Control
|
|
#
|
|
|
|
config SUPPORT_OF_CONTROL
|
|
bool
|
|
|
|
config DTC
|
|
bool
|
|
|
|
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
|
|
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
|
|
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.
|