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 modifcation 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.
106 config DEFAULT_DEVICE_TREE
107 string "Default Device Tree for DT control"
108 depends on OF_CONTROL
110 This option specifies the default Device Tree used for DT control.
111 It can be overridden from the command line:
112 $ make DEVICE_TREE=<device-tree-name>
115 string "List of device tree files to include for DT control"
116 depends on SPL_LOAD_FIT || MULTI_DTB_FIT
117 default DEFAULT_DEVICE_TREE
119 This option specifies a list of device tree files to use for DT
120 control. These will be packaged into a FIT. At run-time, U-boot
121 or SPL will select the correct DT to use by examining the
122 hardware (e.g. reading a board ID value). This is a list of
123 device tree files (without the directory or .dtb suffix)
124 separated by <space>.
128 bool "Support swapping dtbs at a later point in boot"
129 depends on MULTI_DTB_FIT
131 It is possible during initial boot you may need to use a generic
132 dtb until you can fully determine the board your running on. This
133 config allows boards to implement a function at a later point
134 during boot to switch to the "correct" dtb.
137 bool "Support embedding several DTBs in a FIT image for u-boot"
139 This option provides hooks to allow U-boot to parse an
140 appended FIT image and enable board specific code to then select
141 the correct DTB to be used. Use this if you need to support
142 multiple DTBs but don't use the SPL.
145 config SPL_MULTI_DTB_FIT
146 depends on SPL_LOAD_FIT && SPL_OF_CONTROL && !SPL_OF_PLATDATA
147 bool "Support embedding several DTBs in a FIT image for the SPL"
149 This option provides the SPL with the ability to select its own
150 DTB at runtime from an appended FIT image containing several DTBs.
151 This allows using the same SPL binary on multiple platforms.
152 The primary purpose is to handle different versions of
153 the same platform without tweaking the platform code if the
154 differences can be expressed in the DTBs (common examples are: bus
155 capabilities, pad configurations).
158 string "List of device tree files to include for DT control in SPL"
159 depends on SPL_MULTI_DTB_FIT
162 This option specifies a list of device tree files to use for DT
163 control in the SPL. These will be packaged into a FIT. At run-time,
164 the SPL will select the correct DT to use by examining the
165 hardware (e.g. reading a board ID value). This is a list of
166 device tree files (without the directory or .dtb suffix)
167 separated by <space>.
170 prompt "SPL OF LIST compression"
171 depends on SPL_MULTI_DTB_FIT
172 default SPL_MULTI_DTB_FIT_LZO
174 config SPL_MULTI_DTB_FIT_LZO
176 depends on SYS_MALLOC_F
179 Compress the FIT image containing the DTBs available for the SPL
180 using LZO compression. (requires lzop on host).
182 config SPL_MULTI_DTB_FIT_GZIP
184 depends on SYS_MALLOC_F
187 Compress the FIT image containing the DTBs available for the SPL
188 using GZIP compression. (requires gzip on host)
190 config SPL_MULTI_DTB_FIT_NO_COMPRESSION
191 bool "No compression"
193 Do not compress the FIT image containing the DTBs available for the SPL.
194 Use this options only if LZO is not available and the DTBs are very small.
198 prompt "Location of uncompressed DTBs "
199 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
200 default SPL_MULTI_DTB_FIT_DYN_ALLOC if SYS_MALLOC_F
202 config SPL_MULTI_DTB_FIT_DYN_ALLOC
203 bool "Dynamically allocate the memory"
204 depends on SYS_MALLOC_F
206 config SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
207 bool "User-defined location"
210 config SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ
211 hex "Size of memory reserved to uncompress the DTBs"
212 depends on (SPL_MULTI_DTB_FIT_GZIP || SPL_MULTI_DTB_FIT_LZO)
215 This is the size of this area where the DTBs are uncompressed.
216 If this area is dynamically allocated, make sure that
217 SPL_SYS_MALLOC_F_LEN is big enough to contain it.
219 config SPL_MULTI_DTB_FIT_USER_DEF_ADDR
220 hex "Address of memory where dtbs are uncompressed"
221 depends on SPL_MULTI_DTB_FIT_USER_DEFINED_AREA
223 the FIT image containing the DTBs is uncompressed in an area defined
224 at compilation time. This is the address of this area. It must be
225 aligned on 2-byte boundary.
227 config OF_SPL_REMOVE_PROPS
228 string "List of device tree properties to drop for SPL"
229 depends on SPL_OF_CONTROL
230 default "interrupt-parent" if SPL_PINCTRL && SPL_CLK
231 default "clocks clock-names interrupt-parent" if SPL_PINCTRL
232 default "pinctrl-0 pinctrl-names interrupt-parent" if SPL_CLK
233 default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent"
235 Since SPL normally runs in a reduced memory space, the device tree
236 is cut down to only what is needed to load and start U-Boot. Only
237 nodes marked with the property "u-boot,dm-pre-reloc" will be
238 included. In addition, some properties are not used by U-Boot and
239 can be discarded. This option defines the list of properties to
242 config SPL_OF_PLATDATA
243 bool "Generate platform data for use in SPL"
244 depends on SPL_OF_CONTROL
247 For very constrained SPL environments the overhead of decoding
248 device tree nodes and converting their contents into platform data
249 is too large. This overhead includes libfdt code as well as the
250 device tree contents itself. The latter is fairly compact, but the
251 former can add 3KB or more to a Thumb 2 Image.
253 This option enables generation of platform data from the device
254 tree as C code. This code creates devices using U_BOOT_DEVICE()
255 declarations. The benefit is that it allows driver code to access
256 the platform data directly in C structures, avoidin the libfdt
259 This option works by generating C structure declarations for each
260 compatible string, then adding platform data and U_BOOT_DEVICE
261 declarations for each node. See README.platdata for more
264 config TPL_OF_PLATDATA
265 bool "Generate platform data for use in TPL"
266 depends on TPL_OF_CONTROL
269 For very constrained SPL environments the overhead of decoding
270 device tree nodes and converting their contents into platform data
271 is too large. This overhead includes libfdt code as well as the
272 device tree contents itself. The latter is fairly compact, but the
273 former can add 3KB or more to a Thumb 2 Image.
275 This option enables generation of platform data from the device
276 tree as C code. This code creates devices using U_BOOT_DEVICE()
277 declarations. The benefit is that it allows driver code to access
278 the platform data directly in C structures, avoidin the libfdt
281 This option works by generating C structure declarations for each
282 compatible string, then adding platform data and U_BOOT_DEVICE
283 declarations for each node. See README.platdata for more
288 config MKIMAGE_DTC_PATH
289 string "Path to dtc binary for use within mkimage"
292 The mkimage host tool will, in order to generate FIT images make
293 calls to the dtc application in order to create the output. In
294 some cases the system dtc may not support all required features
295 and the path to a different version should be given here.