xref: /openbmc/u-boot/Kconfig (revision 68c27601)
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 DISTRO_DEFAULTS
57	bool "Select defaults suitable for booting general purpose Linux distributions"
58	default y if ARCH_SUNXI
59	default n
60	select CMD_BOOTZ
61	select CMD_DHCP
62	select CMD_EXT2
63	select CMD_EXT4
64	select CMD_FAT
65	select CMD_FS_GENERIC
66	select CMD_MII
67	select CMD_PING
68	select HUSH_PARSER
69	help
70	  Select this to enable various options and commands which are suitable
71	  for building u-boot for booting general purpose Linux distributions.
72
73config SYS_MALLOC_F
74	bool "Enable malloc() pool before relocation"
75	default y if DM
76	help
77	  Before relocation, memory is very limited on many platforms. Still,
78	  we can provide a small malloc() pool if needed. Driver model in
79	  particular needs this to operate, so that it can allocate the
80	  initial serial device and any others that are needed.
81
82config SYS_MALLOC_F_LEN
83	hex "Size of malloc() pool before relocation"
84	depends on SYS_MALLOC_F
85	default 0x400
86	help
87	  Before relocation, memory is very limited on many platforms. Still,
88	  we can provide a small malloc() pool if needed. Driver model in
89	  particular needs this to operate, so that it can allocate the
90	  initial serial device and any others that are needed.
91
92menuconfig EXPERT
93	bool "Configure standard U-Boot features (expert users)"
94	default y
95	help
96	  This option allows certain base U-Boot options and settings
97	  to be disabled or tweaked. This is for specialized
98	  environments which can tolerate a "non-standard" U-Boot.
99	  Use this only if you really know what you are doing.
100
101if EXPERT
102	config SYS_MALLOC_CLEAR_ON_INIT
103	bool "Init with zeros the memory reserved for malloc (slow)"
104	default y
105	help
106	  This setting is enabled by default. The reserved malloc
107	  memory is initialized with zeros, so first malloc calls
108	  will return the pointer to the zeroed memory. But this
109	  slows the boot time.
110
111	  It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
112	  value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
113	  Then the boot time can be significantly reduced.
114	  Warning:
115	  When disabling this, please check if malloc calls, maybe
116	  should be replaced by calloc - if one expects zeroed memory.
117endif
118endmenu		# General setup
119
120menu "Boot images"
121
122config SUPPORT_SPL
123	bool
124
125config SUPPORT_TPL
126	bool
127
128config SPL
129	bool
130	depends on SUPPORT_SPL
131	prompt "Enable SPL"
132	help
133	  If you want to build SPL as well as the normal image, say Y.
134
135config SPL_SYS_MALLOC_SIMPLE
136	bool
137	depends on SPL
138	prompt "Only use malloc_simple functions in the SPL"
139	help
140	  Say Y here to only use the *_simple malloc functions from
141	  malloc_simple.c, rather then using the versions from dlmalloc.c;
142	  this will make the SPL binary smaller at the cost of more heap
143	  usage as the *_simple malloc functions do not re-use free-ed mem.
144
145config SPL_STACK_R
146	depends on SPL
147	bool "Enable SDRAM location for SPL stack"
148	help
149	  SPL starts off execution in SRAM and thus typically has only a small
150	  stack available. Since SPL sets up DRAM while in its board_init_f()
151	  function, it is possible for the stack to move there before
152	  board_init_r() is reached. This option enables a special SDRAM
153	  location for the SPL stack. U-Boot SPL switches to this after
154	  board_init_f() completes, and before board_init_r() starts.
155
156config SPL_STACK_R_ADDR
157	depends on SPL_STACK_R
158	hex "SDRAM location for SPL stack"
159	help
160	  Specify the address in SDRAM for the SPL stack. This will be set up
161	  before board_init_r() is called.
162
163config SPL_STACK_R_MALLOC_SIMPLE_LEN
164	depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
165	hex "Size of malloc_simple heap after switching to DRAM SPL stack"
166	default 0x100000
167	help
168	  Specify the amount of the stack to use as memory pool for
169	  malloc_simple after switching the stack to DRAM. This may be set
170	  to give board_init_r() a larger heap then the initial heap in
171	  SRAM which is limited to SYS_MALLOC_F_LEN bytes.
172
173config SPL_SEPARATE_BSS
174	depends on SPL
175	bool "BSS section is in a different memory region from text"
176	help
177	  Some platforms need a large BSS region in SPL and can provide this
178	  because RAM is already set up. In this case BSS can be moved to RAM.
179	  This option should then be enabled so that the correct device tree
180	  location is used. Normally we put the device tree at the end of BSS
181	  but with this option enabled, it goes at _image_binary_end.
182
183config TPL
184	bool
185	depends on SPL && SUPPORT_TPL
186	prompt "Enable TPL"
187	help
188	  If you want to build TPL as well as the normal image and SPL, say Y.
189
190config FIT
191	bool "Support Flattened Image Tree"
192	help
193	  This option allows to boot the new uImage structrure,
194	  Flattened Image Tree.  FIT is formally a FDT, which can include
195	  images of various types (kernel, FDT blob, ramdisk, etc.)
196	  in a single blob.  To boot this new uImage structure,
197	  pass the address of the blob to the "bootm" command.
198	  FIT is very flexible, supporting compression, multiple images,
199	  multiple configurations, verification through hashing and also
200	  verified boot (secure boot using RSA). This option enables that
201	  feature.
202
203config SPL_FIT
204	bool "Support Flattened Image Tree within SPL"
205	depends on FIT
206	depends on SPL
207
208config FIT_VERBOSE
209	bool "Display verbose messages on FIT boot"
210	depends on FIT
211
212config FIT_SIGNATURE
213	bool "Enable signature verification of FIT uImages"
214	depends on FIT
215	depends on DM
216	select RSA
217	help
218	  This option enables signature verification of FIT uImages,
219	  using a hash signed and verified using RSA. If
220	  CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
221	  hashing is available using hardware, then then RSA library will use
222	  it. See doc/uImage.FIT/signature.txt for more details.
223
224	  WARNING: When relying on signed FIT images with a required signature
225	  check the legacy image format is disabled by default, so that
226	  unsigned images cannot be loaded. If a board needs the legacy image
227	  format support in this case, enable it using
228	  CONFIG_IMAGE_FORMAT_LEGACY.
229
230config SPL_FIT_SIGNATURE
231	bool "Enable signature verification of FIT firmware within SPL"
232	depends on SPL_FIT
233	depends on SPL_DM
234	select SPL_RSA
235
236config FIT_BEST_MATCH
237	bool "Select the best match for the kernel device tree"
238	depends on FIT
239	help
240	  When no configuration is explicitly selected, default to the
241	  one whose fdt's compatibility field best matches that of
242	  U-Boot itself. A match is considered "best" if it matches the
243	  most specific compatibility entry of U-Boot's fdt's root node.
244	  The order of entries in the configuration's fdt is ignored.
245
246config FIT_VERBOSE
247	bool "Show verbose messages when FIT images fails"
248	depends on FIT
249	help
250	  Generally a system will have valid FIT images so debug messages
251	  are a waste of code space. If you are debugging your images then
252	  you can enable this option to get more verbose information about
253	  failures.
254
255config OF_BOARD_SETUP
256	bool "Set up board-specific details in device tree before boot"
257	depends on OF_LIBFDT
258	help
259	  This causes U-Boot to call ft_board_setup() before booting into
260	  the Operating System. This function can set up various
261	  board-specific information in the device tree for use by the OS.
262	  The device tree is then passed to the OS.
263
264config OF_SYSTEM_SETUP
265	bool "Set up system-specific details in device tree before boot"
266	depends on OF_LIBFDT
267	help
268	  This causes U-Boot to call ft_system_setup() before booting into
269	  the Operating System. This function can set up various
270	  system-specific information in the device tree for use by the OS.
271	  The device tree is then passed to the OS.
272
273config OF_STDOUT_VIA_ALIAS
274	bool "Update the device-tree stdout alias from U-Boot"
275	depends on OF_LIBFDT
276	help
277	  This uses U-Boot's serial alias from the aliases node to update
278	  the device tree passed to the OS. The "linux,stdout-path" property
279	  in the chosen node is set to point to the correct serial node.
280	  This option currently references CONFIG_CONS_INDEX, which is
281	  incorrect when used with device tree as this option does not
282	  exist / should not be used.
283
284config SYS_EXTRA_OPTIONS
285	string "Extra Options (DEPRECATED)"
286	help
287	  The old configuration infrastructure (= mkconfig + boards.cfg)
288	  provided the extra options field. If you have something like
289	  "HAS_BAR,BAZ=64", the optional options
290	    #define CONFIG_HAS
291	    #define CONFIG_BAZ	64
292	  will be defined in include/config.h.
293	  This option was prepared for the smooth migration from the old
294	  configuration to Kconfig. Since this option will be removed sometime,
295	  new boards should not use this option.
296
297config SYS_TEXT_BASE
298	depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
299		(M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
300	depends on !EFI_APP
301	hex "Text Base"
302	help
303	  TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
304
305config SPL_LOAD_FIT
306	bool "Enable SPL loading U-Boot as a FIT"
307	depends on FIT
308	help
309	  Normally with the SPL framework a legacy image is generated as part
310	  of the build. This contains U-Boot along with information as to
311	  where it should be loaded. This option instead enables generation
312	  of a FIT (Flat Image Tree) which provides more flexibility. In
313	  particular it can handle selecting from multiple device tree
314	  and passing the correct one to U-Boot.
315
316config SYS_CLK_FREQ
317	depends on ARC || ARCH_SUNXI
318	int "CPU clock frequency"
319	help
320	  TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
321
322endmenu		# Boot images
323
324source "common/Kconfig"
325
326source "cmd/Kconfig"
327
328source "dts/Kconfig"
329
330source "net/Kconfig"
331
332source "drivers/Kconfig"
333
334source "fs/Kconfig"
335
336source "lib/Kconfig"
337
338source "test/Kconfig"
339