5 config SUPPORT_OF_CONTROL
22 config BINMAN_STANDALONE_FDT
25 default y if OF_BOARD || OF_PRIOR_STAGE
27 This option tells U-Boot build system that a standalone device tree
28 source is explicitly required when using binman to package U-Boot.
30 This is not necessary in a common scenario where a device tree source
31 that contains the binman node is provided in the arch/<arch>/dts
32 directory for a specific board. Such device tree sources are built for
33 OF_SEPARATE or OF_EMBED. However for a scenario like the board device
34 tree blob is not provided in the U-Boot build tree, but fed to U-Boot
35 in the runtime, e.g.: in the OF_PRIOR_STAGE case that it is passed by
36 a prior stage bootloader. For such scenario, a standalone device tree
37 blob containing binman node to describe how to package U-Boot should
38 be provided explicitly.
40 menu "Device Tree Control"
41 depends on SUPPORT_OF_CONTROL
44 bool "Run-time configuration via Device Tree"
46 select OF_LIBFDT if !OF_PLATDATA
47 select OF_REAL if !OF_PLATDATA
49 This feature provides for run-time configuration of U-Boot
50 via a flattened device tree.
55 Indicates that a real devicetree is available which can be accessed
56 at runtime. This means that dev_read_...() functions can be used to
57 read data from the devicetree for each device. This is true if
58 OF_CONTROL is enabled in U-Boot proper.
61 bool "Board-specific manipulation of Device Tree"
63 In certain circumstances it is necessary to be able to modify
64 U-Boot's device tree (e.g. to delete device from it). This option
65 make the Device Tree writeable and provides a board-specific
66 "board_fix_fdt" callback (called during pre-relocation time), which
67 enables the board initialization to modifiy the Device Tree. The
68 modified copy is subsequently used by U-Boot after relocation.
71 bool "Enable run-time configuration via Device Tree in SPL"
72 depends on SPL && OF_CONTROL
73 select SPL_OF_LIBFDT if !SPL_OF_PLATDATA
74 select SPL_OF_REAL if !SPL_OF_PLATDATA
76 Some boards use device tree in U-Boot but only have 4KB of SRAM
77 which is not enough to support device tree. Disable this option to
78 allow such boards to be supported by U-Boot SPL.
81 bool "Enable run-time configuration via Device Tree in TPL"
82 depends on TPL && OF_CONTROL
83 select TPL_OF_LIBFDT if !TPL_OF_PLATDATA
84 select TPL_OF_REAL if !TPL_OF_PLATDATA
86 Some boards use device tree in U-Boot but only have 4KB of SRAM
87 which is not enough to support device tree. Enable this option to
88 allow such boards to be supported by U-Boot TPL.
91 bool "Enable use of a live tree"
92 depends on DM && OF_CONTROL
94 Normally U-Boot uses a flat device tree which saves space and
95 avoids the need to unpack the tree before use. However a flat
96 tree does not support modification from within U-Boot since it
97 can invalidate driver-model device tree offsets. This option
98 enables a live tree which is available after relocation,
99 and can be adjusted as needed.
102 prompt "Provider of DTB for DT control"
103 depends on OF_CONTROL
106 bool "Separate DTB for DT control"
109 If this option is enabled, the device tree will be built and
110 placed as a separate u-boot.dtb file alongside the U-Boot image.
113 bool "Embedded DTB for DT control"
115 If this option is enabled, the device tree will be picked up and
116 built into the U-Boot image. This is suitable for local debugging
117 and development only and is not recommended for production devices.
118 Boards in the mainline U-Boot tree should not use it.
121 bool "Provided by the board (e.g a previous loader) at runtime"
124 If this option is enabled, the device tree will be provided by
125 the board at runtime if the board supports it, instead of being
126 bundled with the image.
129 bool "Host filed DTB for DT control"
132 If this option is enabled, DTB will be read from a file on startup.
133 This is only useful for Sandbox. Use the -d flag to U-Boot to
134 specify the file to read.
136 config OF_PRIOR_STAGE
137 bool "Prior stage bootloader DTB for DT control"
139 If this option is enabled, the device tree used for DT
140 control will be read from a device tree binary, at a memory
141 location passed to U-Boot by the prior stage bootloader.
145 config DEFAULT_DEVICE_TREE
146 string "Default Device Tree for DT control"
147 depends on OF_CONTROL
149 This option specifies the default Device Tree used for DT control.
150 It can be overridden from the command line:
151 $ make DEVICE_TREE=<device-tree-name>
154 string "List of device tree files to include for DT control"
155 depends on SPL_LOAD_FIT || MULTI_DTB_FIT
156 default DEFAULT_DEVICE_TREE
158 This option specifies a list of device tree files to use for DT
159 control. These will be packaged into a FIT. At run-time, U-boot
160 or SPL will select the correct DT to use by examining the
161 hardware (e.g. reading a board ID value). This is a list of
162 device tree files (without the directory or .dtb suffix)
163 separated by <space>.
165 config OF_OVERLAY_LIST
166 string "List of device tree overlays to include for DT control"
167 depends on SPL_LOAD_FIT_APPLY_OVERLAY
169 This option specifies a list of device tree overlays to use for DT
170 control. This option can then be used by a FIT generator to include
171 the overlays in the FIT image.
174 prompt "OF LIST compression"
175 depends on MULTI_DTB_FIT
176 default MULTI_DTB_FIT_NO_COMPRESSION
178 config MULTI_DTB_FIT_LZO
180 depends on SYS_MALLOC_F
183 Compress the FIT image containing the DTBs available for the SPL
184 using LZO compression. (requires lzop on host).
186 config MULTI_DTB_FIT_GZIP
188 depends on SYS_MALLOC_F
191 Compress the FIT image containing the DTBs available for the SPL
192 using GZIP compression. (requires gzip on host)
194 config MULTI_DTB_FIT_NO_COMPRESSION
195 bool "No compression"
197 Do not compress the FIT image containing the DTBs available for the SPL.
198 Use this options only if LZO is not available and the DTBs are very small.
202 prompt "Location of uncompressed DTBs"
203 depends on (MULTI_DTB_FIT_GZIP || MULTI_DTB_FIT_LZO)
204 default MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
206 config MULTI_DTB_FIT_DYN_ALLOC
207 bool "Dynamically allocate the memory"
208 depends on SYS_MALLOC_F
210 config MULTI_DTB_FIT_USER_DEFINED_AREA
211 bool "User-defined location"
214 config MULTI_DTB_FIT_UNCOMPRESS_SZ
215 hex "Size of memory reserved to uncompress the DTBs"
216 depends on (MULTI_DTB_FIT_GZIP || MULTI_DTB_FIT_LZO)
219 This is the size of this area where the DTBs are uncompressed.
220 If this area is dynamically allocated, make sure that
221 SYS_MALLOC_F_LEN is big enough to contain it.
223 config MULTI_DTB_FIT_USER_DEF_ADDR
224 hex "Address of memory where dtbs are uncompressed"
225 depends on MULTI_DTB_FIT_USER_DEFINED_AREA
227 the FIT image containing the DTBs is uncompressed in an area defined
228 at compilation time. This is the address of this area. It must be
229 aligned on 2-byte boundary.
232 bool "Support swapping dtbs at a later point in boot"
233 depends on MULTI_DTB_FIT
235 It is possible during initial boot you may need to use a generic
236 dtb until you can fully determine the board your running on. This
237 config allows boards to implement a function at a later point
238 during boot to switch to the "correct" dtb.
241 bool "Support embedding several DTBs in a FIT image for u-boot"
243 This option provides hooks to allow U-boot to parse an
244 appended FIT image and enable board specific code to then select
245 the correct DTB to be used. Use this if you need to support
246 multiple DTBs but don't use the SPL.
249 config SPL_MULTI_DTB_FIT
250 depends on SPL_LOAD_FIT && SPL_OF_REAL
251 bool "Support embedding several DTBs in a FIT image for the SPL"
253 This option provides the SPL with the ability to select its own
254 DTB at runtime from an appended FIT image containing several DTBs.
255 This allows using the same SPL binary on multiple platforms.
256 The primary purpose is to handle different versions of
257 the same platform without tweaking the platform code if the
258 differences can be expressed in the DTBs (common examples are: bus
259 capabilities, pad configurations).
262 string "List of device tree files to include for DT control in SPL"
263 depends on SPL_MULTI_DTB_FIT
266 This option specifies a list of device tree files to use for DT
267 control in the SPL. These will be packaged into a FIT. At run-time,
268 the SPL will select the correct DT to use by examining the
269 hardware (e.g. reading a board ID value). This is a list of
270 device tree files (without the directory or .dtb suffix)
271 separated by <space>.
274 prompt "SPL OF LIST compression"
275 depends on SPL_MULTI_DTB_FIT
276 default SPL_MULTI_DTB_FIT_LZO
278 config SPL_MULTI_DTB_FIT_LZO
280 depends on SYS_MALLOC_F
283 Compress the FIT image containing the DTBs available for the SPL
284 using LZO compression. (requires lzop on host).
286 config SPL_MULTI_DTB_FIT_GZIP
288 depends on SYS_MALLOC_F
291 Compress the FIT image containing the DTBs available for the SPL
292 using GZIP compression. (requires gzip on host)
294 config SPL_MULTI_DTB_FIT_NO_COMPRESSION
295 bool "No compression"
297 Do not compress the FIT image containing the DTBs available for the SPL.
298 Use this options only if LZO is not available and the DTBs are very small.
302 prompt "Location of uncompressed DTBs"
303 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
304 default SPL_MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
306 config SPL_MULTI_DTB_FIT_DYN_ALLOC
307 bool "Dynamically allocate the memory"
308 depends on SYS_MALLOC_F
310 config SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
311 bool "User-defined location"
314 config SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ
315 hex "Size of memory reserved to uncompress the DTBs"
316 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
319 This is the size of this area where the DTBs are uncompressed.
320 If this area is dynamically allocated, make sure that
321 SPL_SYS_MALLOC_F_LEN is big enough to contain it.
323 config SPL_MULTI_DTB_FIT_USER_DEF_ADDR
324 hex "Address of memory where dtbs are uncompressed"
325 depends on SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
327 the FIT image containing the DTBs is uncompressed in an area defined
328 at compilation time. This is the address of this area. It must be
329 aligned on 2-byte boundary.
331 config OF_SPL_REMOVE_PROPS
332 string "List of device tree properties to drop for SPL"
333 depends on SPL_OF_CONTROL
334 default "interrupt-parent interrupts" if SPL_PINCTRL && SPL_CLK
335 default "clocks clock-names interrupt-parent interrupts" if SPL_PINCTRL
336 default "pinctrl-0 pinctrl-names interrupt-parent interrupts" if SPL_CLK
337 default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent interrupts"
339 Since SPL normally runs in a reduced memory space, the device tree
340 is cut down to only what is needed to load and start U-Boot. Only
341 nodes marked with the property "u-boot,dm-pre-reloc" will be
342 included. In addition, some properties are not used by U-Boot and
343 can be discarded. This option defines the list of properties to
346 config OF_DTB_PROPS_REMOVE
347 bool "Enable removal of device tree properties"
348 depends on OF_CONTROL
350 Some boards have restricted amount of storage for U-Boot image.
351 If the generated binary doesn't fit into available image storage,
352 the built-in device tree could probably be cut down by removing
353 some not required device tree properties to reduce the image size.
354 Enable this option and define the properties to be removed in the
355 CONFIG_OF_REMOVE_PROPS list. Do not enable this option if you must
356 pass the built-in DTB directly to the kernel!
358 config OF_REMOVE_PROPS
359 string "List of device tree properties to drop"
360 depends on OF_DTB_PROPS_REMOVE
361 default "interrupt-parent interrupts" if PINCTRL
363 Some properties are not used by U-Boot and can be discarded.
364 This option defines the list of properties to discard.
366 config SPL_OF_PLATDATA
367 bool "Generate platform data for use in SPL"
368 depends on SPL_OF_CONTROL
370 select SPL_OF_PLATDATA_DRIVER_RT if !SPL_OF_PLATDATA_INST
372 For very constrained SPL environments the overhead of decoding
373 device tree nodes and converting their contents into platform data
374 is too large. This overhead includes libfdt code as well as the
375 device tree contents itself. The latter is fairly compact, but the
376 former can add 3KB or more to a Thumb 2 Image.
378 This option enables generation of platform data from the device
379 tree as C code. This code creates devices using U_BOOT_DRVINFO()
380 declarations. The benefit is that it allows driver code to access
381 the platform data directly in C structures, avoidin the libfdt
384 This option works by generating C structure declarations for each
385 compatible string, then adding platform data and U_BOOT_DRVINFO
386 declarations for each node. See of-plat.txt for more information.
391 Indicates that a real devicetree is available which can be accessed
392 at runtime. This means that dev_read_...() functions can be used to
393 read data from the devicetree for each device. This is true if
394 SPL_OF_CONTROL is enabled and not SPL_OF_PLATDATA
398 config SPL_OF_PLATDATA_PARENT
399 bool "Support parent information in devices"
402 Generally it is useful to be able to access the parent of a device
403 with of-platdata. To save space this can be disabled, but in that
404 case dev_get_parent() will always return NULL;
406 config SPL_OF_PLATDATA_INST
407 bool "Declare devices at build time"
409 Declare devices as udevice instances so that they do not need to be
410 bound when U-Boot starts. This can save time and code space.
412 config SPL_OF_PLATDATA_NO_BIND
413 bool "Don't allow run-time binding of devices"
414 depends on SPL_OF_PLATDATA_INST
417 This removes the ability to bind devices at run time, thus saving
418 some code space in U-Boot. This can be disabled if binding is needed,
419 at the code of some code size increase.
421 config SPL_OF_PLATDATA_RT
422 bool "Use a separate struct for device runtime data"
423 depends on SPL_OF_PLATDATA_INST
426 For systems running SPL from read-only memory it is convenient to
427 separate out the runtime information, so that the devices don't need
428 to be copied before being used. This moves the read-write parts of
429 struct udevice (at present just the flags) into a separate struct,
430 which is allocated at runtime.
432 config SPL_OF_PLATDATA_DRIVER_RT
435 Use a separate struct for driver runtime data.
437 This enables the driver_rt information, used with of-platdata when
438 of-platdata-inst is not used. It allows finding devices by their
446 Indicates that a real devicetree is available which can be accessed
447 at runtime. This means that dev_read_...() functions can be used to
448 read data from the devicetree for each device. This is true if
449 TPL_OF_CONTROL is enabled and not TPL_OF_PLATDATA
451 config TPL_OF_PLATDATA
452 bool "Generate platform data for use in TPL"
453 depends on TPL_OF_CONTROL
455 select TPL_OF_PLATDATA_DRIVER_RT if !TPL_OF_PLATDATA_INST
457 For very constrained SPL environments the overhead of decoding
458 device tree nodes and converting their contents into platform data
459 is too large. This overhead includes libfdt code as well as the
460 device tree contents itself. The latter is fairly compact, but the
461 former can add 3KB or more to a Thumb 2 Image.
463 This option enables generation of platform data from the device
464 tree as C code. This code creates devices using U_BOOT_DRVINFO()
465 declarations. The benefit is that it allows driver code to access
466 the platform data directly in C structures, avoidin the libfdt
469 This option works by generating C structure declarations for each
470 compatible string, then adding platform data and U_BOOT_DRVINFO
471 declarations for each node. See of-plat.txt for more information.
475 config TPL_OF_PLATDATA_PARENT
476 bool "Support parent information in devices"
479 Generally it is useful to be able to access the parent of a device
480 with of-platdata. To save space this can be disabled, but in that
481 case dev_get_parent() will always return NULL;
483 config TPL_OF_PLATDATA_INST
484 bool "Declare devices at build time"
487 Declare devices as udevice instances so that they do not need to be
488 bound when U-Boot starts. This can save time and code space.
490 config TPL_OF_PLATDATA_NO_BIND
491 bool "Don't allow run-time binding of devices"
492 depends on TPL_OF_PLATDATA_INST
495 This removes the ability to bind devices at run time, thus saving
496 some code space in U-Boot. This can be disabled if binding is needed,
497 at the code of some code size increase.
499 config TPL_OF_PLATDATA_RT
500 bool "Use a separate struct for device runtime data"
501 depends on TPL_OF_PLATDATA_INST
504 For systems running TPL from read-only memory it is convenient to
505 separate out the runtime information, so that the devices don't need
506 to be copied before being used. This moves the read-write parts of
507 struct udevice (at present just the flags) into a separate struct,
508 which is allocated at runtime.
510 config TPL_OF_PLATDATA_DRIVER_RT
513 Use a separate struct for driver runtime data.
515 This enables the driver_rt information, used with of-platdata when
516 of-platdata-inst is not used. It allows finding devices by their