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. Disable 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>.
133 config OF_OVERLAY_LIST
134 string "List of device tree overlays to include for DT control"
135 depends on SPL_LOAD_FIT_APPLY_OVERLAY
137 This option specifies a list of device tree overlays to use for DT
138 control. This option can then be used by a FIT generator to include
139 the overlays in the FIT image.
142 prompt "OF LIST compression"
143 depends on MULTI_DTB_FIT
144 default MULTI_DTB_FIT_NO_COMPRESSION
146 config MULTI_DTB_FIT_LZO
148 depends on SYS_MALLOC_F
151 Compress the FIT image containing the DTBs available for the SPL
152 using LZO compression. (requires lzop on host).
154 config MULTI_DTB_FIT_GZIP
156 depends on SYS_MALLOC_F
159 Compress the FIT image containing the DTBs available for the SPL
160 using GZIP compression. (requires gzip on host)
162 config MULTI_DTB_FIT_NO_COMPRESSION
163 bool "No compression"
165 Do not compress the FIT image containing the DTBs available for the SPL.
166 Use this options only if LZO is not available and the DTBs are very small.
170 prompt "Location of uncompressed DTBs"
171 depends on (MULTI_DTB_FIT_GZIP || MULTI_DTB_FIT_LZO)
172 default MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
174 config MULTI_DTB_FIT_DYN_ALLOC
175 bool "Dynamically allocate the memory"
176 depends on SYS_MALLOC_F
178 config MULTI_DTB_FIT_USER_DEFINED_AREA
179 bool "User-defined location"
182 config MULTI_DTB_FIT_UNCOMPRESS_SZ
183 hex "Size of memory reserved to uncompress the DTBs"
184 depends on (MULTI_DTB_FIT_GZIP || MULTI_DTB_FIT_LZO)
187 This is the size of this area where the DTBs are uncompressed.
188 If this area is dynamically allocated, make sure that
189 SYS_MALLOC_F_LEN is big enough to contain it.
191 config MULTI_DTB_FIT_USER_DEF_ADDR
192 hex "Address of memory where dtbs are uncompressed"
193 depends on MULTI_DTB_FIT_USER_DEFINED_AREA
195 the FIT image containing the DTBs is uncompressed in an area defined
196 at compilation time. This is the address of this area. It must be
197 aligned on 2-byte boundary.
200 bool "Support swapping dtbs at a later point in boot"
201 depends on MULTI_DTB_FIT
203 It is possible during initial boot you may need to use a generic
204 dtb until you can fully determine the board your running on. This
205 config allows boards to implement a function at a later point
206 during boot to switch to the "correct" dtb.
209 bool "Support embedding several DTBs in a FIT image for u-boot"
211 This option provides hooks to allow U-boot to parse an
212 appended FIT image and enable board specific code to then select
213 the correct DTB to be used. Use this if you need to support
214 multiple DTBs but don't use the SPL.
217 config SPL_MULTI_DTB_FIT
218 depends on SPL_LOAD_FIT && SPL_OF_CONTROL && !SPL_OF_PLATDATA
219 bool "Support embedding several DTBs in a FIT image for the SPL"
221 This option provides the SPL with the ability to select its own
222 DTB at runtime from an appended FIT image containing several DTBs.
223 This allows using the same SPL binary on multiple platforms.
224 The primary purpose is to handle different versions of
225 the same platform without tweaking the platform code if the
226 differences can be expressed in the DTBs (common examples are: bus
227 capabilities, pad configurations).
230 string "List of device tree files to include for DT control in SPL"
231 depends on SPL_MULTI_DTB_FIT
234 This option specifies a list of device tree files to use for DT
235 control in the SPL. These will be packaged into a FIT. At run-time,
236 the SPL will select the correct DT to use by examining the
237 hardware (e.g. reading a board ID value). This is a list of
238 device tree files (without the directory or .dtb suffix)
239 separated by <space>.
242 prompt "SPL OF LIST compression"
243 depends on SPL_MULTI_DTB_FIT
244 default SPL_MULTI_DTB_FIT_LZO
246 config SPL_MULTI_DTB_FIT_LZO
248 depends on SYS_MALLOC_F
251 Compress the FIT image containing the DTBs available for the SPL
252 using LZO compression. (requires lzop on host).
254 config SPL_MULTI_DTB_FIT_GZIP
256 depends on SYS_MALLOC_F
259 Compress the FIT image containing the DTBs available for the SPL
260 using GZIP compression. (requires gzip on host)
262 config SPL_MULTI_DTB_FIT_NO_COMPRESSION
263 bool "No compression"
265 Do not compress the FIT image containing the DTBs available for the SPL.
266 Use this options only if LZO is not available and the DTBs are very small.
270 prompt "Location of uncompressed DTBs"
271 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
272 default SPL_MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
274 config SPL_MULTI_DTB_FIT_DYN_ALLOC
275 bool "Dynamically allocate the memory"
276 depends on SYS_MALLOC_F
278 config SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
279 bool "User-defined location"
282 config SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ
283 hex "Size of memory reserved to uncompress the DTBs"
284 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
287 This is the size of this area where the DTBs are uncompressed.
288 If this area is dynamically allocated, make sure that
289 SPL_SYS_MALLOC_F_LEN is big enough to contain it.
291 config SPL_MULTI_DTB_FIT_USER_DEF_ADDR
292 hex "Address of memory where dtbs are uncompressed"
293 depends on SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
295 the FIT image containing the DTBs is uncompressed in an area defined
296 at compilation time. This is the address of this area. It must be
297 aligned on 2-byte boundary.
299 config OF_SPL_REMOVE_PROPS
300 string "List of device tree properties to drop for SPL"
301 depends on SPL_OF_CONTROL
302 default "interrupt-parent interrupts" if SPL_PINCTRL && SPL_CLK
303 default "clocks clock-names interrupt-parent interrupts" if SPL_PINCTRL
304 default "pinctrl-0 pinctrl-names interrupt-parent interrupts" if SPL_CLK
305 default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent interrupts"
307 Since SPL normally runs in a reduced memory space, the device tree
308 is cut down to only what is needed to load and start U-Boot. Only
309 nodes marked with the property "u-boot,dm-pre-reloc" will be
310 included. In addition, some properties are not used by U-Boot and
311 can be discarded. This option defines the list of properties to
314 config SPL_OF_PLATDATA
315 bool "Generate platform data for use in SPL"
316 depends on SPL_OF_CONTROL
319 For very constrained SPL environments the overhead of decoding
320 device tree nodes and converting their contents into platform data
321 is too large. This overhead includes libfdt code as well as the
322 device tree contents itself. The latter is fairly compact, but the
323 former can add 3KB or more to a Thumb 2 Image.
325 This option enables generation of platform data from the device
326 tree as C code. This code creates devices using U_BOOT_DEVICE()
327 declarations. The benefit is that it allows driver code to access
328 the platform data directly in C structures, avoidin the libfdt
331 This option works by generating C structure declarations for each
332 compatible string, then adding platform data and U_BOOT_DEVICE
333 declarations for each node. See of-plat.txt for more information.
335 config TPL_OF_PLATDATA
336 bool "Generate platform data for use in TPL"
337 depends on TPL_OF_CONTROL
340 For very constrained SPL environments the overhead of decoding
341 device tree nodes and converting their contents into platform data
342 is too large. This overhead includes libfdt code as well as the
343 device tree contents itself. The latter is fairly compact, but the
344 former can add 3KB or more to a Thumb 2 Image.
346 This option enables generation of platform data from the device
347 tree as C code. This code creates devices using U_BOOT_DEVICE()
348 declarations. The benefit is that it allows driver code to access
349 the platform data directly in C structures, avoidin the libfdt
352 This option works by generating C structure declarations for each
353 compatible string, then adding platform data and U_BOOT_DEVICE
354 declarations for each node. See of-plat.txt for more information.
358 config MKIMAGE_DTC_PATH
359 string "Path to dtc binary for use within mkimage"
362 The mkimage host tool will, in order to generate FIT images make
363 calls to the dtc application in order to create the output. In
364 some cases the system dtc may not support all required features
365 and the path to a different version should be given here.