xref: /openbmc/u-boot/Kconfig (revision 7dd12830)
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 LOCALVERSION
18	string "Local version - append to U-Boot release"
19	help
20	  Append an extra string to the end of your U-Boot version.
21	  This will show up in your boot log, for example.
22	  The string you set here will be appended after the contents of
23	  any files with a filename matching localversion* in your
24	  object and source tree, in that order.  Your total string can
25	  be a maximum of 64 characters.
26
27config LOCALVERSION_AUTO
28	bool "Automatically append version information to the version string"
29	default y
30	help
31	  This will try to automatically determine if the current tree is a
32	  release tree by looking for Git tags that belong to the current
33	  top of tree revision.
34
35	  A string of the format -gxxxxxxxx will be added to the localversion
36	  if a Git-based tree is found.  The string generated by this will be
37	  appended after any matching localversion* files, and after the value
38	  set in CONFIG_LOCALVERSION.
39
40	  (The actual string used here is the first eight characters produced
41	  by running the command:
42
43	    $ git rev-parse --verify HEAD
44
45	  which is done within the script "scripts/setlocalversion".)
46
47config CC_OPTIMIZE_FOR_SIZE
48	bool "Optimize for size"
49	default y
50	help
51	  Enabling this option will pass "-Os" instead of "-O2" to gcc
52	  resulting in a smaller U-Boot image.
53
54	  This option is enabled by default for U-Boot.
55
56config SYS_MALLOC_F
57	bool "Enable malloc() pool before relocation"
58	default y if DM
59	help
60	  Before relocation, memory is very limited on many platforms. Still,
61	  we can provide a small malloc() pool if needed. Driver model in
62	  particular needs this to operate, so that it can allocate the
63	  initial serial device and any others that are needed.
64
65config SYS_MALLOC_F_LEN
66	hex "Size of malloc() pool before relocation"
67	depends on SYS_MALLOC_F
68	default 0x400
69	help
70	  Before relocation, memory is very limited on many platforms. Still,
71	  we can provide a small malloc() pool if needed. Driver model in
72	  particular needs this to operate, so that it can allocate the
73	  initial serial device and any others that are needed.
74
75menuconfig EXPERT
76	bool "Configure standard U-Boot features (expert users)"
77	default y
78	help
79	  This option allows certain base U-Boot options and settings
80	  to be disabled or tweaked. This is for specialized
81	  environments which can tolerate a "non-standard" U-Boot.
82	  Use this only if you really know what you are doing.
83
84if EXPERT
85	config SYS_MALLOC_CLEAR_ON_INIT
86	bool "Init with zeros the memory reserved for malloc (slow)"
87	default y
88	help
89	  This setting is enabled by default. The reserved malloc
90	  memory is initialized with zeros, so first malloc calls
91	  will return the pointer to the zeroed memory. But this
92	  slows the boot time.
93
94	  It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
95	  value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
96	  Then the boot time can be significantly reduced.
97	  Warning:
98	  When disabling this, please check if malloc calls, maybe
99	  should be replaced by calloc - if one expects zeroed memory.
100endif
101endmenu		# General setup
102
103menu "Boot images"
104
105config SUPPORT_SPL
106	bool
107
108config SUPPORT_TPL
109	bool
110
111config SPL
112	bool
113	depends on SUPPORT_SPL
114	prompt "Enable SPL"
115	help
116	  If you want to build SPL as well as the normal image, say Y.
117
118config SPL_SYS_MALLOC_SIMPLE
119	bool
120	depends on SPL
121	prompt "Only use malloc_simple functions in the SPL"
122	help
123	  Say Y here to only use the *_simple malloc functions from
124	  malloc_simple.c, rather then using the versions from dlmalloc.c;
125	  this will make the SPL binary smaller at the cost of more heap
126	  usage as the *_simple malloc functions do not re-use free-ed mem.
127
128config SPL_STACK_R
129	depends on SPL
130	bool "Enable SDRAM location for SPL stack"
131	help
132	  SPL starts off execution in SRAM and thus typically has only a small
133	  stack available. Since SPL sets up DRAM while in its board_init_f()
134	  function, it is possible for the stack to move there before
135	  board_init_r() is reached. This option enables a special SDRAM
136	  location for the SPL stack. U-Boot SPL switches to this after
137	  board_init_f() completes, and before board_init_r() starts.
138
139config SPL_STACK_R_ADDR
140	depends on SPL_STACK_R
141	hex "SDRAM location for SPL stack"
142	help
143	  Specify the address in SDRAM for the SPL stack. This will be set up
144	  before board_init_r() is called.
145
146config SPL_STACK_R_MALLOC_SIMPLE_LEN
147	depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
148	hex "Size of malloc_simple heap after switching to DRAM SPL stack"
149	default 0x100000
150	help
151	  Specify the amount of the stack to use as memory pool for
152	  malloc_simple after switching the stack to DRAM. This may be set
153	  to give board_init_r() a larger heap then the initial heap in
154	  SRAM which is limited to SYS_MALLOC_F_LEN bytes.
155
156config SPL_SEPARATE_BSS
157	depends on SPL
158	bool "BSS section is in a different memory region from text"
159	help
160	  Some platforms need a large BSS region in SPL and can provide this
161	  because RAM is already set up. In this case BSS can be moved to RAM.
162	  This option should then be enabled so that the correct device tree
163	  location is used. Normally we put the device tree at the end of BSS
164	  but with this option enabled, it goes at _image_binary_end.
165
166config TPL
167	bool
168	depends on SPL && SUPPORT_TPL
169	prompt "Enable TPL"
170	help
171	  If you want to build TPL as well as the normal image and SPL, say Y.
172
173config FIT
174	bool "Support Flattened Image Tree"
175	help
176	  This option allows to boot the new uImage structrure,
177	  Flattened Image Tree.  FIT is formally a FDT, which can include
178	  images of various types (kernel, FDT blob, ramdisk, etc.)
179	  in a single blob.  To boot this new uImage structure,
180	  pass the address of the blob to the "bootm" command.
181	  FIT is very flexible, supporting compression, multiple images,
182	  multiple configurations, verification through hashing and also
183	  verified boot (secure boot using RSA). This option enables that
184	  feature.
185
186config FIT_VERBOSE
187	bool "Display verbose messages on FIT boot"
188	depends on FIT
189
190config FIT_SIGNATURE
191	bool "Enable signature verification of FIT uImages"
192	depends on FIT
193	depends on DM
194	select RSA
195	help
196	  This option enables signature verification of FIT uImages,
197	  using a hash signed and verified using RSA. If
198	  CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
199	  hashing is available using hardware, then then RSA library will use
200	  it. See doc/uImage.FIT/signature.txt for more details.
201
202	  WARNING: When relying on signed FIT images with a required signature
203	  check the legacy image format is disabled by default, so that
204	  unsigned images cannot be loaded. If a board needs the legacy image
205	  format support in this case, enable it using
206	  CONFIG_IMAGE_FORMAT_LEGACY.
207
208config FIT_BEST_MATCH
209	bool "Select the best match for the kernel device tree"
210	depends on FIT
211	help
212	  When no configuration is explicitly selected, default to the
213	  one whose fdt's compatibility field best matches that of
214	  U-Boot itself. A match is considered "best" if it matches the
215	  most specific compatibility entry of U-Boot's fdt's root node.
216	  The order of entries in the configuration's fdt is ignored.
217
218config FIT_VERBOSE
219	bool "Show verbose messages when FIT images fails"
220	depends on FIT
221	help
222	  Generally a system will have valid FIT images so debug messages
223	  are a waste of code space. If you are debugging your images then
224	  you can enable this option to get more verbose information about
225	  failures.
226
227config OF_BOARD_SETUP
228	bool "Set up board-specific details in device tree before boot"
229	depends on OF_LIBFDT
230	help
231	  This causes U-Boot to call ft_board_setup() before booting into
232	  the Operating System. This function can set up various
233	  board-specific information in the device tree for use by the OS.
234	  The device tree is then passed to the OS.
235
236config OF_SYSTEM_SETUP
237	bool "Set up system-specific details in device tree before boot"
238	depends on OF_LIBFDT
239	help
240	  This causes U-Boot to call ft_system_setup() before booting into
241	  the Operating System. This function can set up various
242	  system-specific information in the device tree for use by the OS.
243	  The device tree is then passed to the OS.
244
245config OF_STDOUT_VIA_ALIAS
246	bool "Update the device-tree stdout alias from U-Boot"
247	depends on OF_LIBFDT
248	help
249	  This uses U-Boot's serial alias from the aliases node to update
250	  the device tree passed to the OS. The "linux,stdout-path" property
251	  in the chosen node is set to point to the correct serial node.
252	  This option currently references CONFIG_CONS_INDEX, which is
253	  incorrect when used with device tree as this option does not
254	  exist / should not be used.
255
256config SYS_EXTRA_OPTIONS
257	string "Extra Options (DEPRECATED)"
258	help
259	  The old configuration infrastructure (= mkconfig + boards.cfg)
260	  provided the extra options field. If you have something like
261	  "HAS_BAR,BAZ=64", the optional options
262	    #define CONFIG_HAS
263	    #define CONFIG_BAZ	64
264	  will be defined in include/config.h.
265	  This option was prepared for the smooth migration from the old
266	  configuration to Kconfig. Since this option will be removed sometime,
267	  new boards should not use this option.
268
269config SYS_TEXT_BASE
270	depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
271		(M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
272	depends on !EFI_APP
273	hex "Text Base"
274	help
275	  TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
276
277config SPL_LOAD_FIT
278	bool "Enable SPL loading U-Boot as a FIT"
279	depends on FIT
280	help
281	  Normally with the SPL framework a legacy image is generated as part
282	  of the build. This contains U-Boot along with information as to
283	  where it should be loaded. This option instead enables generation
284	  of a FIT (Flat Image Tree) which provides more flexibility. In
285	  particular it can handle selecting from multiple device tree
286	  and passing the correct one to U-Boot.
287
288config SYS_CLK_FREQ
289	depends on ARC || ARCH_SUNXI
290	int "CPU clock frequency"
291	help
292	  TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
293
294endmenu		# Boot images
295
296source "common/Kconfig"
297
298source "cmd/Kconfig"
299
300source "dts/Kconfig"
301
302source "net/Kconfig"
303
304source "drivers/Kconfig"
305
306source "fs/Kconfig"
307
308source "lib/Kconfig"
309
310source "test/Kconfig"
311