5 config SUPPORT_OF_CONTROL
22 menu "Device Tree Control"
23 depends on SUPPORT_OF_CONTROL
26 bool "Run-time configuration via Device Tree"
28 select OF_LIBFDT if !OF_PLATDATA
30 This feature provides for run-time configuration of U-Boot
31 via a flattened device tree.
34 bool "Board-specific manipulation of Device Tree"
36 In certain circumstances it is necessary to be able to modify
37 U-Boot's device tree (e.g. to delete device from it). This option
38 make the Device Tree writeable and provides a board-specific
39 "board_fix_fdt" callback (called during pre-relocation time), which
40 enables the board initialization to modifiy the Device Tree. The
41 modified copy is subsequently used by U-Boot after relocation.
44 bool "Enable run-time configuration via Device Tree in SPL"
45 depends on SPL && OF_CONTROL
46 select SPL_OF_LIBFDT if !SPL_OF_PLATDATA
48 Some boards use device tree in U-Boot but only have 4KB of SRAM
49 which is not enough to support device tree. Disable this option to
50 allow such boards to be supported by U-Boot SPL.
53 bool "Enable run-time configuration via Device Tree in TPL"
54 depends on TPL && OF_CONTROL
55 select TPL_OF_LIBFDT if !TPL_OF_PLATDATA
57 Some boards use device tree in U-Boot but only have 4KB of SRAM
58 which is not enough to support device tree. Enable this option to
59 allow such boards to be supported by U-Boot TPL.
62 bool "Enable use of a live tree"
65 Normally U-Boot uses a flat device tree which saves space and
66 avoids the need to unpack the tree before use. However a flat
67 tree does not support modification from within U-Boot since it
68 can invalidate driver-model device tree offsets. This option
69 enables a live tree which is available after relocation,
70 and can be adjusted as needed.
73 prompt "Provider of DTB for DT control"
77 bool "Separate DTB for DT control"
80 If this option is enabled, the device tree will be built and
81 placed as a separate u-boot.dtb file alongside the U-Boot image.
84 bool "Embedded DTB for DT control"
86 If this option is enabled, the device tree will be picked up and
87 built into the U-Boot image. This is suitable for local debugging
88 and development only and is not recommended for production devices.
89 Boards in the mainline U-Boot tree should not use it.
92 bool "Provided by the board at runtime"
95 If this option is enabled, the device tree will be provided by
96 the board at runtime if the board supports it, instead of being
97 bundled with the image.
100 bool "Host filed DTB for DT control"
103 If this option is enabled, DTB will be read from a file on startup.
104 This is only useful for Sandbox. Use the -d flag to U-Boot to
105 specify the file to read.
107 config OF_PRIOR_STAGE
108 bool "Prior stage bootloader DTB for DT control"
110 If this option is enabled, the device tree used for DT
111 control will be read from a device tree binary, at a memory
112 location passed to U-Boot by the prior stage bootloader.
116 config DEFAULT_DEVICE_TREE
117 string "Default Device Tree for DT control"
118 depends on OF_CONTROL
120 This option specifies the default Device Tree used for DT control.
121 It can be overridden from the command line:
122 $ make DEVICE_TREE=<device-tree-name>
125 string "List of device tree files to include for DT control"
126 depends on SPL_LOAD_FIT || MULTI_DTB_FIT
127 default DEFAULT_DEVICE_TREE
129 This option specifies a list of device tree files to use for DT
130 control. These will be packaged into a FIT. At run-time, U-boot
131 or SPL will select the correct DT to use by examining the
132 hardware (e.g. reading a board ID value). This is a list of
133 device tree files (without the directory or .dtb suffix)
134 separated by <space>.
136 config OF_OVERLAY_LIST
137 string "List of device tree overlays to include for DT control"
138 depends on SPL_LOAD_FIT_APPLY_OVERLAY
140 This option specifies a list of device tree overlays to use for DT
141 control. This option can then be used by a FIT generator to include
142 the overlays in the FIT image.
145 prompt "OF LIST compression"
146 depends on MULTI_DTB_FIT
147 default MULTI_DTB_FIT_NO_COMPRESSION
149 config MULTI_DTB_FIT_LZO
151 depends on SYS_MALLOC_F
154 Compress the FIT image containing the DTBs available for the SPL
155 using LZO compression. (requires lzop on host).
157 config MULTI_DTB_FIT_GZIP
159 depends on SYS_MALLOC_F
162 Compress the FIT image containing the DTBs available for the SPL
163 using GZIP compression. (requires gzip on host)
165 config MULTI_DTB_FIT_NO_COMPRESSION
166 bool "No compression"
168 Do not compress the FIT image containing the DTBs available for the SPL.
169 Use this options only if LZO is not available and the DTBs are very small.
173 prompt "Location of uncompressed DTBs"
174 depends on (MULTI_DTB_FIT_GZIP || MULTI_DTB_FIT_LZO)
175 default MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
177 config MULTI_DTB_FIT_DYN_ALLOC
178 bool "Dynamically allocate the memory"
179 depends on SYS_MALLOC_F
181 config MULTI_DTB_FIT_USER_DEFINED_AREA
182 bool "User-defined location"
185 config MULTI_DTB_FIT_UNCOMPRESS_SZ
186 hex "Size of memory reserved to uncompress the DTBs"
187 depends on (MULTI_DTB_FIT_GZIP || MULTI_DTB_FIT_LZO)
190 This is the size of this area where the DTBs are uncompressed.
191 If this area is dynamically allocated, make sure that
192 SYS_MALLOC_F_LEN is big enough to contain it.
194 config MULTI_DTB_FIT_USER_DEF_ADDR
195 hex "Address of memory where dtbs are uncompressed"
196 depends on MULTI_DTB_FIT_USER_DEFINED_AREA
198 the FIT image containing the DTBs is uncompressed in an area defined
199 at compilation time. This is the address of this area. It must be
200 aligned on 2-byte boundary.
203 bool "Support swapping dtbs at a later point in boot"
204 depends on MULTI_DTB_FIT
206 It is possible during initial boot you may need to use a generic
207 dtb until you can fully determine the board your running on. This
208 config allows boards to implement a function at a later point
209 during boot to switch to the "correct" dtb.
212 bool "Support embedding several DTBs in a FIT image for u-boot"
214 This option provides hooks to allow U-boot to parse an
215 appended FIT image and enable board specific code to then select
216 the correct DTB to be used. Use this if you need to support
217 multiple DTBs but don't use the SPL.
220 config SPL_MULTI_DTB_FIT
221 depends on SPL_LOAD_FIT && SPL_OF_CONTROL && !SPL_OF_PLATDATA
222 bool "Support embedding several DTBs in a FIT image for the SPL"
224 This option provides the SPL with the ability to select its own
225 DTB at runtime from an appended FIT image containing several DTBs.
226 This allows using the same SPL binary on multiple platforms.
227 The primary purpose is to handle different versions of
228 the same platform without tweaking the platform code if the
229 differences can be expressed in the DTBs (common examples are: bus
230 capabilities, pad configurations).
233 string "List of device tree files to include for DT control in SPL"
234 depends on SPL_MULTI_DTB_FIT
237 This option specifies a list of device tree files to use for DT
238 control in the SPL. These will be packaged into a FIT. At run-time,
239 the SPL will select the correct DT to use by examining the
240 hardware (e.g. reading a board ID value). This is a list of
241 device tree files (without the directory or .dtb suffix)
242 separated by <space>.
245 prompt "SPL OF LIST compression"
246 depends on SPL_MULTI_DTB_FIT
247 default SPL_MULTI_DTB_FIT_LZO
249 config SPL_MULTI_DTB_FIT_LZO
251 depends on SYS_MALLOC_F
254 Compress the FIT image containing the DTBs available for the SPL
255 using LZO compression. (requires lzop on host).
257 config SPL_MULTI_DTB_FIT_GZIP
259 depends on SYS_MALLOC_F
262 Compress the FIT image containing the DTBs available for the SPL
263 using GZIP compression. (requires gzip on host)
265 config SPL_MULTI_DTB_FIT_NO_COMPRESSION
266 bool "No compression"
268 Do not compress the FIT image containing the DTBs available for the SPL.
269 Use this options only if LZO is not available and the DTBs are very small.
273 prompt "Location of uncompressed DTBs"
274 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
275 default SPL_MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
277 config SPL_MULTI_DTB_FIT_DYN_ALLOC
278 bool "Dynamically allocate the memory"
279 depends on SYS_MALLOC_F
281 config SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
282 bool "User-defined location"
285 config SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ
286 hex "Size of memory reserved to uncompress the DTBs"
287 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
290 This is the size of this area where the DTBs are uncompressed.
291 If this area is dynamically allocated, make sure that
292 SPL_SYS_MALLOC_F_LEN is big enough to contain it.
294 config SPL_MULTI_DTB_FIT_USER_DEF_ADDR
295 hex "Address of memory where dtbs are uncompressed"
296 depends on SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
298 the FIT image containing the DTBs is uncompressed in an area defined
299 at compilation time. This is the address of this area. It must be
300 aligned on 2-byte boundary.
302 config OF_SPL_REMOVE_PROPS
303 string "List of device tree properties to drop for SPL"
304 depends on SPL_OF_CONTROL
305 default "interrupt-parent interrupts" if SPL_PINCTRL && SPL_CLK
306 default "clocks clock-names interrupt-parent interrupts" if SPL_PINCTRL
307 default "pinctrl-0 pinctrl-names interrupt-parent interrupts" if SPL_CLK
308 default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent interrupts"
310 Since SPL normally runs in a reduced memory space, the device tree
311 is cut down to only what is needed to load and start U-Boot. Only
312 nodes marked with the property "u-boot,dm-pre-reloc" will be
313 included. In addition, some properties are not used by U-Boot and
314 can be discarded. This option defines the list of properties to
317 config OF_DTB_PROPS_REMOVE
318 bool "Enable removal of device tree properties"
319 depends on OF_CONTROL
321 Some boards have restricted amount of storage for U-Boot image.
322 If the generated binary doesn't fit into available image storage,
323 the built-in device tree could probably be cut down by removing
324 some not required device tree properties to reduce the image size.
325 Enable this option and define the properties to be removed in the
326 CONFIG_OF_REMOVE_PROPS list. Do not enable this option if you must
327 pass the built-in DTB directly to the kernel!
329 config OF_REMOVE_PROPS
330 string "List of device tree properties to drop"
331 depends on OF_DTB_PROPS_REMOVE
332 default "interrupt-parent interrupts" if PINCTRL
334 Some properties are not used by U-Boot and can be discarded.
335 This option defines the list of properties to discard.
337 config SPL_OF_PLATDATA
338 bool "Generate platform data for use in SPL"
339 depends on SPL_OF_CONTROL
342 For very constrained SPL environments the overhead of decoding
343 device tree nodes and converting their contents into platform data
344 is too large. This overhead includes libfdt code as well as the
345 device tree contents itself. The latter is fairly compact, but the
346 former can add 3KB or more to a Thumb 2 Image.
348 This option enables generation of platform data from the device
349 tree as C code. This code creates devices using U_BOOT_DEVICE()
350 declarations. The benefit is that it allows driver code to access
351 the platform data directly in C structures, avoidin the libfdt
354 This option works by generating C structure declarations for each
355 compatible string, then adding platform data and U_BOOT_DEVICE
356 declarations for each node. See of-plat.txt for more information.
358 config TPL_OF_PLATDATA
359 bool "Generate platform data for use in TPL"
360 depends on TPL_OF_CONTROL
363 For very constrained SPL environments the overhead of decoding
364 device tree nodes and converting their contents into platform data
365 is too large. This overhead includes libfdt code as well as the
366 device tree contents itself. The latter is fairly compact, but the
367 former can add 3KB or more to a Thumb 2 Image.
369 This option enables generation of platform data from the device
370 tree as C code. This code creates devices using U_BOOT_DEVICE()
371 declarations. The benefit is that it allows driver code to access
372 the platform data directly in C structures, avoidin the libfdt
375 This option works by generating C structure declarations for each
376 compatible string, then adding platform data and U_BOOT_DEVICE
377 declarations for each node. See of-plat.txt for more information.
381 config MKIMAGE_DTC_PATH
382 string "Path to dtc binary for use within mkimage"
385 The mkimage host tool will, in order to generate FIT images make
386 calls to the dtc application in order to create the output. In
387 some cases the system dtc may not support all required features
388 and the path to a different version should be given here.