5 config SUPPORT_OF_CONTROL
22 menu "Device Tree Control"
23 depends on SUPPORT_OF_CONTROL
26 bool "Run-time configuration via Device Tree"
29 This feature provides for run-time configuration of U-Boot
30 via a flattened device tree.
33 bool "Board-specific manipulation of Device Tree"
35 In certain circumstances it is necessary to be able to modify
36 U-Boot's device tree (e.g. to delete device from it). This option
37 make the Device Tree writeable and provides a board-specific
38 "board_fix_fdt" callback (called during pre-relocation time), which
39 enables the board initialization to modifiy the Device Tree. The
40 modified copy is subsequently used by U-Boot after relocation.
43 bool "Enable run-time configuration via Device Tree in SPL"
44 depends on SPL && OF_CONTROL
46 Some boards use device tree in U-Boot but only have 4KB of SRAM
47 which is not enough to support device tree. Enable this option to
48 allow such boards to be supported by U-Boot SPL.
51 bool "Enable run-time configuration via Device Tree in TPL"
52 depends on TPL && OF_CONTROL
54 Some boards use device tree in U-Boot but only have 4KB of SRAM
55 which is not enough to support device tree. Enable this option to
56 allow such boards to be supported by U-Boot TPL.
59 bool "Enable use of a live tree"
62 Normally U-Boot uses a flat device tree which saves space and
63 avoids the need to unpack the tree before use. However a flat
64 tree does not support modification from within U-Boot since it
65 can invalidate driver-model device tree offsets. This option
66 enables a live tree which is available after relocation,
67 and can be adjusted as needed.
70 prompt "Provider of DTB for DT control"
74 bool "Separate DTB for DT control"
77 If this option is enabled, the device tree will be built and
78 placed as a separate u-boot.dtb file alongside the U-Boot image.
81 bool "Embedded DTB for DT control"
83 If this option is enabled, the device tree will be picked up and
84 built into the U-Boot image. This is suitable for local debugging
85 and development only and is not recommended for production devices.
86 Boards in the mainline U-Boot tree should not use it.
89 bool "Provided by the board at runtime"
92 If this option is enabled, the device tree will be provided by
93 the board at runtime if the board supports it, instead of being
94 bundled with the image.
97 bool "Host filed DTB for DT control"
100 If this option is enabled, DTB will be read from a file on startup.
101 This is only useful for Sandbox. Use the -d flag to U-Boot to
102 specify the file to read.
104 config OF_PRIOR_STAGE
105 bool "Prior stage bootloader DTB for DT control"
107 If this option is enabled, the device tree used for DT
108 control will be read from a device tree binary, at a memory
109 location passed to U-Boot by the prior stage bootloader.
113 config DEFAULT_DEVICE_TREE
114 string "Default Device Tree for DT control"
115 depends on OF_CONTROL
117 This option specifies the default Device Tree used for DT control.
118 It can be overridden from the command line:
119 $ make DEVICE_TREE=<device-tree-name>
122 string "List of device tree files to include for DT control"
123 depends on SPL_LOAD_FIT || MULTI_DTB_FIT
124 default DEFAULT_DEVICE_TREE
126 This option specifies a list of device tree files to use for DT
127 control. These will be packaged into a FIT. At run-time, U-boot
128 or SPL will select the correct DT to use by examining the
129 hardware (e.g. reading a board ID value). This is a list of
130 device tree files (without the directory or .dtb suffix)
131 separated by <space>.
134 prompt "SPL OF LIST compression"
135 depends on MULTI_DTB_FIT
136 default MULTI_DTB_FIT_NO_COMPRESSION
138 config MULTI_DTB_FIT_LZO
140 depends on SYS_MALLOC_F
143 Compress the FIT image containing the DTBs available for the SPL
144 using LZO compression. (requires lzop on host).
146 config MULTI_DTB_FIT_GZIP
148 depends on SYS_MALLOC_F
151 Compress the FIT image containing the DTBs available for the SPL
152 using GZIP compression. (requires gzip on host)
154 config MULTI_DTB_FIT_NO_COMPRESSION
155 bool "No compression"
157 Do not compress the FIT image containing the DTBs available for the SPL.
158 Use this options only if LZO is not available and the DTBs are very small.
162 prompt "Location of uncompressed DTBs"
163 depends on (MULTI_DTB_FIT_GZIP || MULTI_DTB_FIT_LZO)
164 default MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
166 config MULTI_DTB_FIT_DYN_ALLOC
167 bool "Dynamically allocate the memory"
168 depends on SYS_MALLOC_F
170 config MULTI_DTB_FIT_USER_DEFINED_AREA
171 bool "User-defined location"
174 config MULTI_DTB_FIT_UNCOMPRESS_SZ
175 hex "Size of memory reserved to uncompress the DTBs"
176 depends on (MULTI_DTB_FIT_GZIP || MULTI_DTB_FIT_LZO)
179 This is the size of this area where the DTBs are uncompressed.
180 If this area is dynamically allocated, make sure that
181 SYS_MALLOC_F_LEN is big enough to contain it.
183 config MULTI_DTB_FIT_USER_DEF_ADDR
184 hex "Address of memory where dtbs are uncompressed"
185 depends on MULTI_DTB_FIT_USER_DEFINED_AREA
187 the FIT image containing the DTBs is uncompressed in an area defined
188 at compilation time. This is the address of this area. It must be
189 aligned on 2-byte boundary.
192 bool "Support swapping dtbs at a later point in boot"
193 depends on MULTI_DTB_FIT
195 It is possible during initial boot you may need to use a generic
196 dtb until you can fully determine the board your running on. This
197 config allows boards to implement a function at a later point
198 during boot to switch to the "correct" dtb.
201 bool "Support embedding several DTBs in a FIT image for u-boot"
203 This option provides hooks to allow U-boot to parse an
204 appended FIT image and enable board specific code to then select
205 the correct DTB to be used. Use this if you need to support
206 multiple DTBs but don't use the SPL.
209 config SPL_MULTI_DTB_FIT
210 depends on SPL_LOAD_FIT && SPL_OF_CONTROL && !SPL_OF_PLATDATA
211 bool "Support embedding several DTBs in a FIT image for the SPL"
213 This option provides the SPL with the ability to select its own
214 DTB at runtime from an appended FIT image containing several DTBs.
215 This allows using the same SPL binary on multiple platforms.
216 The primary purpose is to handle different versions of
217 the same platform without tweaking the platform code if the
218 differences can be expressed in the DTBs (common examples are: bus
219 capabilities, pad configurations).
222 string "List of device tree files to include for DT control in SPL"
223 depends on SPL_MULTI_DTB_FIT
226 This option specifies a list of device tree files to use for DT
227 control in the SPL. These will be packaged into a FIT. At run-time,
228 the SPL will select the correct DT to use by examining the
229 hardware (e.g. reading a board ID value). This is a list of
230 device tree files (without the directory or .dtb suffix)
231 separated by <space>.
234 prompt "SPL OF LIST compression"
235 depends on SPL_MULTI_DTB_FIT
236 default SPL_MULTI_DTB_FIT_LZO
238 config SPL_MULTI_DTB_FIT_LZO
240 depends on SYS_MALLOC_F
243 Compress the FIT image containing the DTBs available for the SPL
244 using LZO compression. (requires lzop on host).
246 config SPL_MULTI_DTB_FIT_GZIP
248 depends on SYS_MALLOC_F
251 Compress the FIT image containing the DTBs available for the SPL
252 using GZIP compression. (requires gzip on host)
254 config SPL_MULTI_DTB_FIT_NO_COMPRESSION
255 bool "No compression"
257 Do not compress the FIT image containing the DTBs available for the SPL.
258 Use this options only if LZO is not available and the DTBs are very small.
262 prompt "Location of uncompressed DTBs"
263 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
264 default SPL_MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
266 config SPL_MULTI_DTB_FIT_DYN_ALLOC
267 bool "Dynamically allocate the memory"
268 depends on SYS_MALLOC_F
270 config SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
271 bool "User-defined location"
274 config SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ
275 hex "Size of memory reserved to uncompress the DTBs"
276 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
279 This is the size of this area where the DTBs are uncompressed.
280 If this area is dynamically allocated, make sure that
281 SPL_SYS_MALLOC_F_LEN is big enough to contain it.
283 config SPL_MULTI_DTB_FIT_USER_DEF_ADDR
284 hex "Address of memory where dtbs are uncompressed"
285 depends on SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
287 the FIT image containing the DTBs is uncompressed in an area defined
288 at compilation time. This is the address of this area. It must be
289 aligned on 2-byte boundary.
291 config OF_SPL_REMOVE_PROPS
292 string "List of device tree properties to drop for SPL"
293 depends on SPL_OF_CONTROL
294 default "interrupt-parent interrupts" if SPL_PINCTRL && SPL_CLK
295 default "clocks clock-names interrupt-parent interrupts" if SPL_PINCTRL
296 default "pinctrl-0 pinctrl-names interrupt-parent interrupts" if SPL_CLK
297 default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent interrupts"
299 Since SPL normally runs in a reduced memory space, the device tree
300 is cut down to only what is needed to load and start U-Boot. Only
301 nodes marked with the property "u-boot,dm-pre-reloc" will be
302 included. In addition, some properties are not used by U-Boot and
303 can be discarded. This option defines the list of properties to
306 config SPL_OF_PLATDATA
307 bool "Generate platform data for use in SPL"
308 depends on SPL_OF_CONTROL
311 For very constrained SPL environments the overhead of decoding
312 device tree nodes and converting their contents into platform data
313 is too large. This overhead includes libfdt code as well as the
314 device tree contents itself. The latter is fairly compact, but the
315 former can add 3KB or more to a Thumb 2 Image.
317 This option enables generation of platform data from the device
318 tree as C code. This code creates devices using U_BOOT_DEVICE()
319 declarations. The benefit is that it allows driver code to access
320 the platform data directly in C structures, avoidin the libfdt
323 This option works by generating C structure declarations for each
324 compatible string, then adding platform data and U_BOOT_DEVICE
325 declarations for each node. See of-plat.txt for more information.
327 config TPL_OF_PLATDATA
328 bool "Generate platform data for use in TPL"
329 depends on TPL_OF_CONTROL
332 For very constrained SPL environments the overhead of decoding
333 device tree nodes and converting their contents into platform data
334 is too large. This overhead includes libfdt code as well as the
335 device tree contents itself. The latter is fairly compact, but the
336 former can add 3KB or more to a Thumb 2 Image.
338 This option enables generation of platform data from the device
339 tree as C code. This code creates devices using U_BOOT_DEVICE()
340 declarations. The benefit is that it allows driver code to access
341 the platform data directly in C structures, avoidin the libfdt
344 This option works by generating C structure declarations for each
345 compatible string, then adding platform data and U_BOOT_DEVICE
346 declarations for each node. See of-plat.txt for more information.
350 config MKIMAGE_DTC_PATH
351 string "Path to dtc binary for use within mkimage"
354 The mkimage host tool will, in order to generate FIT images make
355 calls to the dtc application in order to create the output. In
356 some cases the system dtc may not support all required features
357 and the path to a different version should be given here.