xref: /openbmc/u-boot/Kconfig (revision 8eef803a)
1#
2# For a description of the syntax of this configuration file,
3# see the file Documentation/kbuild/kconfig-language.txt in the
4# Linux kernel source tree.
5#
6mainmenu "U-Boot $UBOOTVERSION Configuration"
7
8config UBOOTVERSION
9	string
10	option env="UBOOTVERSION"
11
12# Allow defaults in arch-specific code to override any given here
13source "arch/Kconfig"
14
15menu "General setup"
16
17config BROKEN
18	bool
19	help
20	  This option cannot be enabled. It is used as dependency
21	  for broken and incomplete features.
22
23config LOCALVERSION
24	string "Local version - append to U-Boot release"
25	help
26	  Append an extra string to the end of your U-Boot version.
27	  This will show up in your boot log, for example.
28	  The string you set here will be appended after the contents of
29	  any files with a filename matching localversion* in your
30	  object and source tree, in that order.  Your total string can
31	  be a maximum of 64 characters.
32
33config LOCALVERSION_AUTO
34	bool "Automatically append version information to the version string"
35	default y
36	help
37	  This will try to automatically determine if the current tree is a
38	  release tree by looking for Git tags that belong to the current
39	  top of tree revision.
40
41	  A string of the format -gxxxxxxxx will be added to the localversion
42	  if a Git-based tree is found.  The string generated by this will be
43	  appended after any matching localversion* files, and after the value
44	  set in CONFIG_LOCALVERSION.
45
46	  (The actual string used here is the first eight characters produced
47	  by running the command:
48
49	    $ git rev-parse --verify HEAD
50
51	  which is done within the script "scripts/setlocalversion".)
52
53config CC_OPTIMIZE_FOR_SIZE
54	bool "Optimize for size"
55	default y
56	help
57	  Enabling this option will pass "-Os" instead of "-O2" to gcc
58	  resulting in a smaller U-Boot image.
59
60	  This option is enabled by default for U-Boot.
61
62config CC_COVERAGE
63	bool "Enable code coverage analysis"
64	depends on SANDBOX
65	help
66	  Enabling this option will pass "--coverage" to gcc to compile
67	  and link code instrumented for coverage analysis.
68
69config DISTRO_DEFAULTS
70	bool "Select defaults suitable for booting general purpose Linux distributions"
71	select AUTO_COMPLETE
72	select CMDLINE_EDITING
73	select CMD_BOOTI if ARM64
74	select CMD_BOOTZ if ARM && !ARM64
75	select CMD_DHCP if CMD_NET
76	select CMD_ENV_EXISTS
77	select CMD_EXT2
78	select CMD_EXT4
79	select CMD_FAT
80	select CMD_FS_GENERIC
81	select CMD_PART if PARTITIONS
82	select CMD_PING if CMD_NET
83	select CMD_PXE if NET
84	select ENV_VARS_UBOOT_CONFIG
85	select HUSH_PARSER
86	select SUPPORT_RAW_INITRD
87	select SYS_LONGHELP
88	imply CMD_MII if NET
89	imply USB_STORAGE
90	imply USE_BOOTCOMMAND
91	help
92	  Select this to enable various options and commands which are suitable
93	  for building u-boot for booting general purpose Linux distributions.
94
95config ENV_VARS_UBOOT_CONFIG
96	bool "Add arch, board, vendor and soc variables to default environment"
97	help
98	  Define this in order to add variables describing the
99	  U-Boot build configuration to the default environment.
100	  These will be named arch, cpu, board, vendor, and soc.
101	  Enabling this option will cause the following to be defined:
102	  - CONFIG_SYS_ARCH
103	  - CONFIG_SYS_CPU
104	  - CONFIG_SYS_BOARD
105	  - CONFIG_SYS_VENDOR
106	  - CONFIG_SYS_SOC
107
108config NR_DRAM_BANKS
109	int "Number of DRAM banks"
110	default 4
111	help
112	  This defines the number of DRAM banks.
113
114config SYS_BOOT_GET_CMDLINE
115	bool "Enable kernel command line setup"
116	help
117	  Enables allocating and saving kernel cmdline in space between
118	  "bootm_low" and "bootm_low" + BOOTMAPSZ.
119
120config SYS_BOOT_GET_KBD
121	bool "Enable kernel board information setup"
122	help
123	  Enables allocating and saving a kernel copy of the bd_info in
124	  space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
125
126config SYS_MALLOC_F
127	bool "Enable malloc() pool before relocation"
128	default y if DM
129
130	help
131	  Before relocation, memory is very limited on many platforms. Still,
132	  we can provide a small malloc() pool if needed. Driver model in
133	  particular needs this to operate, so that it can allocate the
134	  initial serial device and any others that are needed.
135
136config SYS_MALLOC_F_LEN
137	hex "Size of malloc() pool before relocation"
138	depends on SYS_MALLOC_F
139	default 0x1000 if AM33XX
140	default 0x2800 if SANDBOX
141	default 0x400
142	help
143	  Before relocation, memory is very limited on many platforms. Still,
144	  we can provide a small malloc() pool if needed. Driver model in
145	  particular needs this to operate, so that it can allocate the
146	  initial serial device and any others that are needed.
147
148config SYS_MALLOC_LEN
149	hex "Define memory for Dynamic allocation"
150	depends on ARCH_ZYNQ || ARCH_VERSAL
151	help
152	  This defines memory to be allocated for Dynamic allocation
153	  TODO: Use for other architectures
154
155config SPL_SYS_MALLOC_F_LEN
156	hex "Size of malloc() pool in SPL before relocation"
157	depends on SYS_MALLOC_F
158	default SYS_MALLOC_F_LEN
159	help
160	  Before relocation, memory is very limited on many platforms. Still,
161	  we can provide a small malloc() pool if needed. Driver model in
162	  particular needs this to operate, so that it can allocate the
163	  initial serial device and any others that are needed.
164
165config TPL_SYS_MALLOC_F_LEN
166	hex "Size of malloc() pool in TPL before relocation"
167	depends on SYS_MALLOC_F
168	default SYS_MALLOC_F_LEN
169	help
170	  Before relocation, memory is very limited on many platforms. Still,
171	  we can provide a small malloc() pool if needed. Driver model in
172	  particular needs this to operate, so that it can allocate the
173	  initial serial device and any others that are needed.
174
175menuconfig EXPERT
176	bool "Configure standard U-Boot features (expert users)"
177	default y
178	help
179	  This option allows certain base U-Boot options and settings
180	  to be disabled or tweaked. This is for specialized
181	  environments which can tolerate a "non-standard" U-Boot.
182	  Use this only if you really know what you are doing.
183
184if EXPERT
185	config SYS_MALLOC_CLEAR_ON_INIT
186	bool "Init with zeros the memory reserved for malloc (slow)"
187	default y
188	help
189	  This setting is enabled by default. The reserved malloc
190	  memory is initialized with zeros, so first malloc calls
191	  will return the pointer to the zeroed memory. But this
192	  slows the boot time.
193
194	  It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
195	  value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
196	  Then the boot time can be significantly reduced.
197	  Warning:
198	  When disabling this, please check if malloc calls, maybe
199	  should be replaced by calloc - if one expects zeroed memory.
200
201config TOOLS_DEBUG
202	bool "Enable debug information for tools"
203	help
204	  Enable generation of debug information for tools such as mkimage.
205	  This can be used for debugging purposes. With debug information
206	  it is possible to set breakpoints on particular lines, single-step
207	  debug through the source code, etc.
208
209endif # EXPERT
210
211config PHYS_64BIT
212	bool "64bit physical address support"
213	help
214	  Say Y here to support 64bit physical memory address.
215	  This can be used not only for 64bit SoCs, but also for
216	  large physical address extension on 32bit SoCs.
217
218config BUILD_ROM
219	bool "Build U-Boot as BIOS replacement"
220	depends on X86
221	help
222	  This option allows to build a ROM version of U-Boot.
223	  The build process generally requires several binary blobs
224	  which are not shipped in the U-Boot source tree.
225	  Please, see doc/README.x86 for details.
226
227endmenu		# General setup
228
229menu "Boot images"
230
231config ANDROID_BOOT_IMAGE
232	bool "Enable support for Android Boot Images"
233	default y if FASTBOOT
234	help
235	  This enables support for booting images which use the Android
236	  image format header.
237
238config FIT
239	bool "Support Flattened Image Tree"
240	select MD5
241	select SHA1
242	help
243	  This option allows you to boot the new uImage structure,
244	  Flattened Image Tree.  FIT is formally a FDT, which can include
245	  images of various types (kernel, FDT blob, ramdisk, etc.)
246	  in a single blob.  To boot this new uImage structure,
247	  pass the address of the blob to the "bootm" command.
248	  FIT is very flexible, supporting compression, multiple images,
249	  multiple configurations, verification through hashing and also
250	  verified boot (secure boot using RSA).
251
252if FIT
253
254config FIT_EXTERNAL_OFFSET
255	hex "Text Base"
256	default 0x0
257	help
258	  This specifies a data offset in fit image.
259	  The offset is from data payload offset to the beginning of
260	  fit image header. When specifies a offset, specific data
261	  could be put in the hole between data payload and fit image
262	  header, such as CSF data on i.MX platform.
263
264config FIT_ENABLE_SHA256_SUPPORT
265	bool "Support SHA256 checksum of FIT image contents"
266	default y
267	select SHA256
268	help
269	  Enable this to support SHA256 checksum of FIT image contents. A
270	  SHA256 checksum is a 256-bit (32-byte) hash value used to check that
271	  the image contents have not been corrupted. SHA256 is recommended
272	  for use in secure applications since (as at 2016) there is no known
273	  feasible attack that could produce a 'collision' with differing
274	  input data. Use this for the highest security. Note that only the
275	  SHA256 variant is supported: SHA512 and others are not currently
276	  supported in U-Boot.
277
278config FIT_SIGNATURE
279	bool "Enable signature verification of FIT uImages"
280	depends on DM
281	select HASH
282	select RSA
283	help
284	  This option enables signature verification of FIT uImages,
285	  using a hash signed and verified using RSA. If
286	  CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
287	  hashing is available using hardware, then the RSA library will use
288	  it. See doc/uImage.FIT/signature.txt for more details.
289
290	  WARNING: When relying on signed FIT images with a required signature
291	  check the legacy image format is disabled by default, so that
292	  unsigned images cannot be loaded. If a board needs the legacy image
293	  format support in this case, enable it using
294	  CONFIG_IMAGE_FORMAT_LEGACY.
295
296config FIT_SIGNATURE_MAX_SIZE
297	hex "Max size of signed FIT structures"
298	depends on FIT_SIGNATURE
299	default 0x10000000
300	help
301	  This option sets a max size in bytes for verified FIT uImages.
302	  A sane value of 256MB protects corrupted DTB structures from overlapping
303	  device memory. Assure this size does not extend past expected storage
304	  space.
305
306config FIT_ENABLE_RSASSA_PSS_SUPPORT
307	bool "Support rsassa-pss signature scheme of FIT image contents"
308	depends on FIT_SIGNATURE
309	default n
310	help
311	  Enable this to support the pss padding algorithm as described
312	  in the rfc8017 (https://tools.ietf.org/html/rfc8017).
313
314config FIT_VERBOSE
315	bool "Show verbose messages when FIT images fail"
316	help
317	  Generally a system will have valid FIT images so debug messages
318	  are a waste of code space. If you are debugging your images then
319	  you can enable this option to get more verbose information about
320	  failures.
321
322config FIT_BEST_MATCH
323	bool "Select the best match for the kernel device tree"
324	help
325	  When no configuration is explicitly selected, default to the
326	  one whose fdt's compatibility field best matches that of
327	  U-Boot itself. A match is considered "best" if it matches the
328	  most specific compatibility entry of U-Boot's fdt's root node.
329	  The order of entries in the configuration's fdt is ignored.
330
331config FIT_IMAGE_POST_PROCESS
332	bool "Enable post-processing of FIT artifacts after loading by U-Boot"
333	depends on TI_SECURE_DEVICE
334	help
335	  Allows doing any sort of manipulation to blobs after they got extracted
336	  from FIT images like stripping off headers or modifying the size of the
337	  blob, verification, authentication, decryption etc. in a platform or
338	  board specific way. In order to use this feature a platform or board-
339	  specific implementation of board_fit_image_post_process() must be
340	  provided. Also, anything done during this post-processing step would
341	  need to be comprehended in how the images were prepared before being
342	  injected into the FIT creation (i.e. the blobs would have been pre-
343	  processed before being added to the FIT image).
344
345if SPL
346
347config SPL_FIT
348	bool "Support Flattened Image Tree within SPL"
349	depends on SPL
350	select SPL_OF_LIBFDT
351
352config SPL_FIT_PRINT
353	bool "Support FIT printing within SPL"
354	depends on SPL_FIT
355	help
356	  Support printing the content of the fitImage in a verbose manner in SPL.
357
358config SPL_FIT_SIGNATURE
359	bool "Enable signature verification of FIT firmware within SPL"
360	depends on SPL_DM
361	select SPL_FIT
362	select SPL_RSA
363
364config SPL_LOAD_FIT
365	bool "Enable SPL loading U-Boot as a FIT"
366	select SPL_FIT
367	help
368	  Normally with the SPL framework a legacy image is generated as part
369	  of the build. This contains U-Boot along with information as to
370	  where it should be loaded. This option instead enables generation
371	  of a FIT (Flat Image Tree) which provides more flexibility. In
372	  particular it can handle selecting from multiple device tree
373	  and passing the correct one to U-Boot.
374
375config SPL_LOAD_FIT_FULL
376	bool "Enable SPL loading U-Boot as a FIT"
377	select SPL_FIT
378	help
379	  Normally with the SPL framework a legacy image is generated as part
380	  of the build. This contains U-Boot along with information as to
381	  where it should be loaded. This option instead enables generation
382	  of a FIT (Flat Image Tree) which provides more flexibility. In
383	  particular it can handle selecting from multiple device tree
384	  and passing the correct one to U-Boot.
385
386config SPL_FIT_IMAGE_POST_PROCESS
387	bool "Enable post-processing of FIT artifacts after loading by the SPL"
388	depends on SPL_LOAD_FIT
389	help
390	  Allows doing any sort of manipulation to blobs after they got extracted
391	  from the U-Boot FIT image like stripping off headers or modifying the
392	  size of the blob, verification, authentication, decryption etc. in a
393	  platform or board specific way. In order to use this feature a platform
394	  or board-specific implementation of board_fit_image_post_process() must
395	  be provided. Also, anything done during this post-processing step would
396	  need to be comprehended in how the images were prepared before being
397	  injected into the FIT creation (i.e. the blobs would have been pre-
398	  processed before being added to the FIT image).
399
400config SPL_FIT_SOURCE
401	string ".its source file for U-Boot FIT image"
402	depends on SPL_FIT
403	help
404	  Specifies a (platform specific) FIT source file to generate the
405	  U-Boot FIT image. This could specify further image to load and/or
406	  execute.
407
408config SPL_FIT_GENERATOR
409	string ".its file generator script for U-Boot FIT image"
410	depends on SPL_FIT
411	default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
412	help
413	  Specifies a (platform specific) script file to generate the FIT
414	  source file used to build the U-Boot FIT image file. This gets
415	  passed a list of supported device tree file stub names to
416	  include in the generated image.
417
418endif # SPL
419
420endif # FIT
421
422config IMAGE_FORMAT_LEGACY
423	bool "Enable support for the legacy image format"
424	default y if !FIT_SIGNATURE
425	help
426	  This option enables the legacy image format. It is enabled by
427	  default for backward compatibility, unless FIT_SIGNATURE is
428	  set where it is disabled so that unsigned images cannot be
429	  loaded. If a board needs the legacy image format support in this
430	  case, enable it here.
431
432config OF_BOARD_SETUP
433	bool "Set up board-specific details in device tree before boot"
434	depends on OF_LIBFDT
435	help
436	  This causes U-Boot to call ft_board_setup() before booting into
437	  the Operating System. This function can set up various
438	  board-specific information in the device tree for use by the OS.
439	  The device tree is then passed to the OS.
440
441config OF_SYSTEM_SETUP
442	bool "Set up system-specific details in device tree before boot"
443	depends on OF_LIBFDT
444	help
445	  This causes U-Boot to call ft_system_setup() before booting into
446	  the Operating System. This function can set up various
447	  system-specific information in the device tree for use by the OS.
448	  The device tree is then passed to the OS.
449
450config OF_STDOUT_VIA_ALIAS
451	bool "Update the device-tree stdout alias from U-Boot"
452	depends on OF_LIBFDT
453	help
454	  This uses U-Boot's serial alias from the aliases node to update
455	  the device tree passed to the OS. The "linux,stdout-path" property
456	  in the chosen node is set to point to the correct serial node.
457	  This option currently references CONFIG_CONS_INDEX, which is
458	  incorrect when used with device tree as this option does not
459	  exist / should not be used.
460
461config SYS_EXTRA_OPTIONS
462	string "Extra Options (DEPRECATED)"
463	help
464	  The old configuration infrastructure (= mkconfig + boards.cfg)
465	  provided the extra options field. If you have something like
466	  "HAS_BAR,BAZ=64", the optional options
467	    #define CONFIG_HAS
468	    #define CONFIG_BAZ	64
469	  will be defined in include/config.h.
470	  This option was prepared for the smooth migration from the old
471	  configuration to Kconfig. Since this option will be removed sometime,
472	  new boards should not use this option.
473
474config SYS_TEXT_BASE
475	depends on !NIOS2 && !XTENSA
476	depends on !EFI_APP
477	default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
478	default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
479	default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
480	default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
481	hex "Text Base"
482	help
483	  The address in memory that U-Boot will be running from, initially.
484
485
486
487config SYS_CLK_FREQ
488	depends on ARC || ARCH_SUNXI
489	int "CPU clock frequency"
490	help
491	  TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
492
493config ARCH_FIXUP_FDT_MEMORY
494	bool "Enable arch_fixup_memory_banks() call"
495	default y
496	help
497	  Enable FDT memory map syncup before OS boot. This feature can be
498	  used for booting OS with different memory setup where the part of
499	  the memory location should be used for different purpose.
500
501endmenu		# Boot images
502
503source "api/Kconfig"
504
505source "common/Kconfig"
506
507source "cmd/Kconfig"
508
509source "disk/Kconfig"
510
511source "dts/Kconfig"
512
513source "env/Kconfig"
514
515source "net/Kconfig"
516
517source "drivers/Kconfig"
518
519source "fs/Kconfig"
520
521source "lib/Kconfig"
522
523source "test/Kconfig"
524