xref: /openbmc/u-boot/Kconfig (revision 21845825)
1#
2# For a description of the syntax of this configuration file,
3# see Documentation/kbuild/kconfig-language.txt.
4#
5mainmenu "U-Boot $UBOOTVERSION Configuration"
6
7config UBOOTVERSION
8	string
9	option env="UBOOTVERSION"
10
11# Allow defaults in arch-specific code to override any given here
12source "arch/Kconfig"
13
14menu "General setup"
15
16config LOCALVERSION
17	string "Local version - append to U-Boot release"
18	help
19	  Append an extra string to the end of your U-Boot version.
20	  This will show up on your boot log, for example.
21	  The string you set here will be appended after the contents of
22	  any files with a filename matching localversion* in your
23	  object and source tree, in that order.  Your total string can
24	  be a maximum of 64 characters.
25
26config LOCALVERSION_AUTO
27	bool "Automatically append version information to the version string"
28	default y
29	help
30	  This will try to automatically determine if the current tree is a
31	  release tree by looking for git tags that belong to the current
32	  top of tree revision.
33
34	  A string of the format -gxxxxxxxx will be added to the localversion
35	  if a git-based tree is found.  The string generated by this will be
36	  appended after any matching localversion* files, and after the value
37	  set in CONFIG_LOCALVERSION.
38
39	  (The actual string used here is the first eight characters produced
40	  by running the command:
41
42	    $ git rev-parse --verify HEAD
43
44	  which is done within the script "scripts/setlocalversion".)
45
46config CC_OPTIMIZE_FOR_SIZE
47	bool "Optimize for size"
48	default y
49	help
50	  Enabling this option will pass "-Os" instead of "-O2" to gcc
51	  resulting in a smaller U-Boot image.
52
53	  This option is enabled by default for U-Boot.
54
55config SYS_MALLOC_F
56	bool "Enable malloc() pool before relocation"
57	default y if DM
58	help
59	  Before relocation memory is very limited on many platforms. Still,
60	  we can provide a small malloc() pool if needed. Driver model in
61	  particular needs this to operate, so that it can allocate the
62	  initial serial device and any others that are needed.
63
64config SYS_MALLOC_F_LEN
65	hex "Size of malloc() pool before relocation"
66	depends on SYS_MALLOC_F
67	default 0x400
68	help
69	  Before relocation memory is very limited on many platforms. Still,
70	  we can provide a small malloc() pool if needed. Driver model in
71	  particular needs this to operate, so that it can allocate the
72	  initial serial device and any others that are needed.
73
74menuconfig EXPERT
75	bool "Configure standard U-Boot features (expert users)"
76	default y
77	help
78	  This option allows certain base U-Boot options and settings
79	  to be disabled or tweaked. This is for specialized
80	  environments which can tolerate a "non-standard" U-Boot.
81	  Only use this if you really know what you are doing.
82
83if EXPERT
84	config SYS_MALLOC_CLEAR_ON_INIT
85	bool "Init with zeros the memory reserved for malloc (slow)"
86	default y
87	help
88	  This setting is enabled by default. The reserved malloc
89	  memory is initialized with zeros, so first malloc calls
90	  will return the pointer to the zeroed memory. But this
91	  slows the boot time.
92
93	  It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
94	  value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
95	  Then the boot time can be significantly reduced.
96	  Warning:
97	  When disabling this, please check if malloc calls, maybe
98	  should be replaced by calloc - if expects zeroed memory.
99endif
100endmenu		# General setup
101
102menu "Boot images"
103
104config SUPPORT_SPL
105	bool
106
107config SUPPORT_TPL
108	bool
109
110config SPL
111	bool
112	depends on SUPPORT_SPL
113	prompt "Enable SPL"
114	help
115	  If you want to build SPL as well as the normal image, say Y.
116
117config SPL_SYS_MALLOC_SIMPLE
118	bool
119	depends on SPL
120	prompt "Only use malloc_simple functions in the spl"
121	help
122	  Say Y here to only use the *_simple malloc functions from
123	  malloc_simple.c, rather then using the versions from dlmalloc.c
124	  this will make the SPL binary smaller at the cost of more heap
125	  usage as the *_simple malloc functions do not re-use free-ed mem.
126
127config SPL_STACK_R
128	depends on SPL
129	bool "Enable SDRAM location for SPL stack"
130	help
131	  SPL starts off execution in SRAM and thus typically has only a small
132	  stack available. Since SPL sets up DRAM while in its board_init_f()
133	  function, it is possible for the stack to move there before
134	  board_init_r() is reached. This option enables a special SDRAM
135	  location for the SPL stack. U-Boot SPL switches to this after
136	  board_init_f() completes, and before board_init_r() starts.
137
138config SPL_STACK_R_ADDR
139	depends on SPL_STACK_R
140	hex "SDRAM location for SPL stack"
141	help
142	  Specify the address in SDRAM for the SPL stack. This will be set up
143	  before board_init_r() is called.
144
145config SPL_STACK_R_MALLOC_SIMPLE_LEN
146	depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
147	hex "Size of malloc_simple heap after switching to DRAM SPL stack"
148	default 0x100000
149	help
150	  Specify the amount of the stack to use as memory pool for
151	  malloc_simple after switching the stack to DRAM. This may be set
152	  to give board_init_r() a larger heap then the initial heap in
153	  SRAM which is limited to SYS_MALLOC_F_LEN bytes.
154
155config SPL_SEPARATE_BSS
156	depends on SPL
157	bool "BSS section is in a different memory region from text"
158	help
159	  Some platforms need a large BSS region in SPL and can provide this
160	  because RAM is already set up. In this case BSS can be moved to RAM.
161	  This option should then be enabled so that the correct device tree
162	  location is used. Normally we put the device tree at the end of BSS
163	  but with this option enabled, it goes at _image_binary_end.
164
165config TPL
166	bool
167	depends on SPL && SUPPORT_TPL
168	prompt "Enable TPL"
169	help
170	  If you want to build TPL as well as the normal image and SPL, say Y.
171
172config FIT
173	bool "Support Flattened Image Tree"
174	help
175	  This option allows to boot the new uImage structrure,
176	  Flattened Image Tree.  FIT is formally a FDT, which can include
177	  images of various types (kernel, FDT blob, ramdisk, etc.)
178	  in a single blob.  To boot this new uImage structure,
179	  pass the address of the blob to the "bootm" command.
180	  FIT is very flexible, supporting compression, multiple images,
181	  multiple configurations, verification through hashing and also
182	  verified boot (secure boot using RSA). This option enables that
183	  feature.
184
185config FIT_VERBOSE
186	bool "Display verbose messages on FIT boot"
187	depends on FIT
188
189config FIT_SIGNATURE
190	bool "Enable signature verification of FIT uImages"
191	depends on FIT
192	depends on DM
193	select RSA
194	help
195	  This option enables signature verification of FIT uImages,
196	  using a hash signed and verified using RSA. If
197	  CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
198	  hashing is available using hardware, then then RSA library will use
199	  it. See doc/uImage.FIT/signature.txt for more details.
200
201	  WARNING: When relying on signed FIT images with a required signature
202	  check the legacy image format is disabled by default, so that
203	  unsigned images cannot be loaded. If a board needs the legacy image
204	  format support in this case, enable it using
205	  CONFIG_IMAGE_FORMAT_LEGACY.
206
207config FIT_BEST_MATCH
208	bool "Select the best match for the kernel device tree"
209	depends on FIT
210	help
211	  When no configuration is explicitly selected, default to the
212	  one whose fdt's compatibility field best matches that of
213	  U-Boot itself. A match is considered "best" if it matches the
214	  most specific compatibility entry of U-Boot's fdt's root node.
215	  The order of entries in the configuration's fdt is ignored.
216
217config FIT_VERBOSE
218	bool "Show verbose messages when FIT images fails"
219	depends on FIT
220	help
221	  Generally a system will have valid FIT images so debug messages
222	  are a waste of code space. If you are debugging your images then
223	  you can enable this option to get more verbose information about
224	  failures.
225
226config OF_BOARD_SETUP
227	bool "Set up board-specific details in device tree before boot"
228	depends on OF_LIBFDT
229	help
230	  This causes U-Boot to call ft_board_setup() before booting into
231	  the Operating System. This function can set up various
232	  board-specific information in the device tree for use by the OS.
233	  The device tree is then passed to the OS.
234
235config OF_SYSTEM_SETUP
236	bool "Set up system-specific details in device tree before boot"
237	depends on OF_LIBFDT
238	help
239	  This causes U-Boot to call ft_system_setup() before booting into
240	  the Operating System. This function can set up various
241	  system-specific information in the device tree for use by the OS.
242	  The device tree is then passed to the OS.
243
244config OF_STDOUT_VIA_ALIAS
245	bool "Update the device-tree stdout alias from U-Boot"
246	depends on OF_LIBFDT
247	help
248	  This uses U-Boot's serial alias from the aliases node to update
249	  the device tree passed to the OS. The "linux,stdout-path" property
250	  in the chosen node is set to point to the correct serial node.
251	  This option currently references CONFIG_CONS_INDEX, which is
252	  incorrect when used with device tree as this option does not
253	  exist / should not be used.
254
255config SYS_EXTRA_OPTIONS
256	string "Extra Options (DEPRECATED)"
257	help
258	  The old configuration infrastructure (= mkconfig + boards.cfg)
259	  provided the extra options field. If you have something like
260	  "HAS_BAR,BAZ=64", the optional options
261	    #define CONFIG_HAS
262	    #define CONFIG_BAZ	64
263	  will be defined in include/config.h.
264	  This option was prepared for the smooth migration from the old
265	  configuration to Kconfig. Since this option will be removed sometime,
266	  new boards should not use this option.
267
268config SYS_TEXT_BASE
269	depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
270		(M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE
271	depends on !EFI_APP
272	hex "Text Base"
273	help
274	  TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
275
276config SPL_LOAD_FIT
277	bool "Enable SPL loading U-Boot as a FIT"
278	depends on FIT
279	help
280	  Normally with the SPL framework a legacy image is generated as part
281	  of the build. This contains U-Boot along with information as to
282	  where it should be loaded. This option instead enables generation
283	  of a FIT (Flat Image Tree) which provides more flexibility. In
284	  particular it can handle selecting from multiple device tree
285	  and passing the correct one to U-Boot.
286
287config SYS_CLK_FREQ
288	depends on ARC || ARCH_SUNXI
289	int "CPU clock frequency"
290	help
291	  TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
292
293endmenu		# Boot images
294
295source "common/Kconfig"
296
297source "cmd/Kconfig"
298
299source "dts/Kconfig"
300
301source "net/Kconfig"
302
303source "drivers/Kconfig"
304
305source "fs/Kconfig"
306
307source "lib/Kconfig"
308
309source "test/Kconfig"
310