303 lines
10 KiB
Plaintext
303 lines
10 KiB
Plaintext
#
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# Device Tree Control
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#
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config SUPPORT_OF_CONTROL
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bool
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config DTC
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bool
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config PYLIBFDT
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bool
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config DTOC
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bool
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select PYLIBFDT
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config BINMAN
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bool
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select DTOC
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menu "Device Tree Control"
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depends on SUPPORT_OF_CONTROL
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config OF_CONTROL
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bool "Run-time configuration via Device Tree"
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select DTC
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help
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This feature provides for run-time configuration of U-Boot
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via a flattened device tree.
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config OF_BOARD_FIXUP
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bool "Board-specific manipulation of Device Tree"
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help
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In certain circumstances it is necessary to be able to modify
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U-Boot's device tree (e.g. to delete device from it). This option
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make the Device Tree writeable and provides a board-specific
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"board_fix_fdt" callback (called during pre-relocation time), which
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enables the board initialization to modifiy the Device Tree. The
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modified copy is subsequently used by U-Boot after relocation.
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config SPL_OF_CONTROL
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bool "Enable run-time configuration via Device Tree in SPL"
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depends on SPL && OF_CONTROL
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help
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Some boards use device tree in U-Boot but only have 4KB of SRAM
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which is not enough to support device tree. Enable this option to
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allow such boards to be supported by U-Boot SPL.
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config TPL_OF_CONTROL
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bool "Enable run-time configuration via Device Tree in TPL"
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depends on TPL && OF_CONTROL
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help
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Some boards use device tree in U-Boot but only have 4KB of SRAM
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which is not enough to support device tree. Enable this option to
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allow such boards to be supported by U-Boot TPL.
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config OF_LIVE
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bool "Enable use of a live tree"
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depends on OF_CONTROL
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help
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Normally U-Boot uses a flat device tree which saves space and
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avoids the need to unpack the tree before use. However a flat
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tree does not support modification from within U-Boot since it
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can invalidate driver-model device tree offsets. This option
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enables a live tree which is available after relocation,
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and can be adjusted as needed.
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choice
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prompt "Provider of DTB for DT control"
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depends on OF_CONTROL
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config OF_SEPARATE
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bool "Separate DTB for DT control"
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depends on !SANDBOX
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help
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If this option is enabled, the device tree will be built and
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placed as a separate u-boot.dtb file alongside the U-Boot image.
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config OF_EMBED
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bool "Embedded DTB for DT control"
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help
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If this option is enabled, the device tree will be picked up and
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built into the U-Boot image. This is suitable for local debugging
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and development only and is not recommended for production devices.
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Boards in the mainline U-Boot tree should not use it.
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config OF_BOARD
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bool "Provided by the board at runtime"
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depends on !SANDBOX
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help
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If this option is enabled, the device tree will be provided by
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the board at runtime if the board supports it, instead of being
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bundled with the image.
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config OF_HOSTFILE
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bool "Host filed DTB for DT control"
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depends on SANDBOX
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help
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If this option is enabled, DTB will be read from a file on startup.
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This is only useful for Sandbox. Use the -d flag to U-Boot to
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specify the file to read.
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config OF_PRIOR_STAGE
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bool "Prior stage bootloader DTB for DT control"
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help
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If this option is enabled, the device tree used for DT
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control will be read from a device tree binary, at a memory
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location passed to U-Boot by the prior stage bootloader.
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endchoice
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config DEFAULT_DEVICE_TREE
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string "Default Device Tree for DT control"
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depends on OF_CONTROL
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help
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This option specifies the default Device Tree used for DT control.
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It can be overridden from the command line:
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$ make DEVICE_TREE=<device-tree-name>
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config OF_LIST
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string "List of device tree files to include for DT control"
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depends on SPL_LOAD_FIT || MULTI_DTB_FIT
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default DEFAULT_DEVICE_TREE
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help
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This option specifies a list of device tree files to use for DT
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control. These will be packaged into a FIT. At run-time, U-boot
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or SPL will select the correct DT to use by examining the
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hardware (e.g. reading a board ID value). This is a list of
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device tree files (without the directory or .dtb suffix)
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separated by <space>.
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config DTB_RESELECT
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bool "Support swapping dtbs at a later point in boot"
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depends on MULTI_DTB_FIT
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help
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It is possible during initial boot you may need to use a generic
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dtb until you can fully determine the board your running on. This
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config allows boards to implement a function at a later point
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during boot to switch to the "correct" dtb.
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config MULTI_DTB_FIT
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bool "Support embedding several DTBs in a FIT image for u-boot"
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help
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This option provides hooks to allow U-boot to parse an
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appended FIT image and enable board specific code to then select
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the correct DTB to be used. Use this if you need to support
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multiple DTBs but don't use the SPL.
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config SPL_MULTI_DTB_FIT
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depends on SPL_LOAD_FIT && SPL_OF_CONTROL && !SPL_OF_PLATDATA
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bool "Support embedding several DTBs in a FIT image for the SPL"
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help
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This option provides the SPL with the ability to select its own
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DTB at runtime from an appended FIT image containing several DTBs.
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This allows using the same SPL binary on multiple platforms.
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The primary purpose is to handle different versions of
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the same platform without tweaking the platform code if the
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differences can be expressed in the DTBs (common examples are: bus
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capabilities, pad configurations).
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config SPL_OF_LIST
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string "List of device tree files to include for DT control in SPL"
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depends on SPL_MULTI_DTB_FIT
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default OF_LIST
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help
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This option specifies a list of device tree files to use for DT
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control in the SPL. These will be packaged into a FIT. At run-time,
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the SPL will select the correct DT to use by examining the
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hardware (e.g. reading a board ID value). This is a list of
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device tree files (without the directory or .dtb suffix)
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separated by <space>.
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choice
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prompt "SPL OF LIST compression"
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depends on SPL_MULTI_DTB_FIT
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default SPL_MULTI_DTB_FIT_LZO
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config SPL_MULTI_DTB_FIT_LZO
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bool "LZO"
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depends on SYS_MALLOC_F
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select SPL_LZO
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help
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Compress the FIT image containing the DTBs available for the SPL
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using LZO compression. (requires lzop on host).
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config SPL_MULTI_DTB_FIT_GZIP
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bool "GZIP"
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depends on SYS_MALLOC_F
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select SPL_GZIP
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help
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Compress the FIT image containing the DTBs available for the SPL
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using GZIP compression. (requires gzip on host)
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config SPL_MULTI_DTB_FIT_NO_COMPRESSION
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bool "No compression"
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help
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Do not compress the FIT image containing the DTBs available for the SPL.
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Use this options only if LZO is not available and the DTBs are very small.
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endchoice
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choice
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prompt "Location of uncompressed DTBs"
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depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
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default SPL_MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
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config SPL_MULTI_DTB_FIT_DYN_ALLOC
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bool "Dynamically allocate the memory"
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depends on SYS_MALLOC_F
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config SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
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bool "User-defined location"
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endchoice
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config SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ
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hex "Size of memory reserved to uncompress the DTBs"
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depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
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default 0x8000
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help
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This is the size of this area where the DTBs are uncompressed.
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If this area is dynamically allocated, make sure that
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SPL_SYS_MALLOC_F_LEN is big enough to contain it.
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config SPL_MULTI_DTB_FIT_USER_DEF_ADDR
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hex "Address of memory where dtbs are uncompressed"
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depends on SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
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help
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the FIT image containing the DTBs is uncompressed in an area defined
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at compilation time. This is the address of this area. It must be
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aligned on 2-byte boundary.
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config OF_SPL_REMOVE_PROPS
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string "List of device tree properties to drop for SPL"
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depends on SPL_OF_CONTROL
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default "interrupt-parent" if SPL_PINCTRL && SPL_CLK
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default "clocks clock-names interrupt-parent" if SPL_PINCTRL
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default "pinctrl-0 pinctrl-names interrupt-parent" if SPL_CLK
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default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent"
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help
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Since SPL normally runs in a reduced memory space, the device tree
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is cut down to only what is needed to load and start U-Boot. Only
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nodes marked with the property "u-boot,dm-pre-reloc" will be
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included. In addition, some properties are not used by U-Boot and
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can be discarded. This option defines the list of properties to
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discard.
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config SPL_OF_PLATDATA
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bool "Generate platform data for use in SPL"
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depends on SPL_OF_CONTROL
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select DTOC
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help
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For very constrained SPL environments the overhead of decoding
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device tree nodes and converting their contents into platform data
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is too large. This overhead includes libfdt code as well as the
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device tree contents itself. The latter is fairly compact, but the
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former can add 3KB or more to a Thumb 2 Image.
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This option enables generation of platform data from the device
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tree as C code. This code creates devices using U_BOOT_DEVICE()
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declarations. The benefit is that it allows driver code to access
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the platform data directly in C structures, avoidin the libfdt
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overhead.
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This option works by generating C structure declarations for each
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compatible string, then adding platform data and U_BOOT_DEVICE
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declarations for each node. See README.platdata for more
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information.
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config TPL_OF_PLATDATA
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bool "Generate platform data for use in TPL"
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depends on TPL_OF_CONTROL
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select DTOC
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help
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For very constrained SPL environments the overhead of decoding
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device tree nodes and converting their contents into platform data
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is too large. This overhead includes libfdt code as well as the
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device tree contents itself. The latter is fairly compact, but the
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former can add 3KB or more to a Thumb 2 Image.
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This option enables generation of platform data from the device
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tree as C code. This code creates devices using U_BOOT_DEVICE()
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declarations. The benefit is that it allows driver code to access
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the platform data directly in C structures, avoidin the libfdt
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overhead.
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This option works by generating C structure declarations for each
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compatible string, then adding platform data and U_BOOT_DEVICE
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declarations for each node. See README.platdata for more
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information.
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endmenu
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config MKIMAGE_DTC_PATH
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string "Path to dtc binary for use within mkimage"
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default "dtc"
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help
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The mkimage host tool will, in order to generate FIT images make
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calls to the dtc application in order to create the output. In
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some cases the system dtc may not support all required features
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and the path to a different version should be given here.
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