# # 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= 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 . 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 . 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.