1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
|
menu "Boot timing"
config BOOTSTAGE
bool "Boot timing and reporting"
help
Enable recording of boot time while booting. To use it, insert
calls to bootstage_mark() with a suitable BOOTSTAGE_ID from
bootstage.h. Only a single entry is recorded for each ID. You can
give the entry a name with bootstage_mark_name(). You can also
record elapsed time in a particular stage using bootstage_start()
before starting and bootstage_accum() when finished. Bootstage will
add up all the accumulated time and report it.
Normally, IDs are defined in bootstage.h but a small number of
additional 'user' IDs can be used by passing BOOTSTAGE_ID_ALLOC
as the ID.
Calls to show_boot_progress() will also result in log entries but
these will not have names.
config BOOTSTAGE_REPORT
bool "Display a detailed boot timing report before booting the OS"
depends on BOOTSTAGE
help
Enable output of a boot time report just before the OS is booted.
This shows how long it took U-Boot to go through each stage of the
boot process. The report looks something like this:
Timer summary in microseconds:
Mark Elapsed Stage
0 0 reset
3,575,678 3,575,678 board_init_f start
3,575,695 17 arch_cpu_init A9
3,575,777 82 arch_cpu_init done
3,659,598 83,821 board_init_r start
3,910,375 250,777 main_loop
29,916,167 26,005,792 bootm_start
30,361,327 445,160 start_kernel
config BOOTSTAGE_USER_COUNT
hex "Number of boot ID numbers available for user use"
default 20
help
This is the number of available user bootstage records.
Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
a new ID will be allocated from this stash. If you exceed
the limit, recording will stop.
config BOOTSTAGE_FDT
bool "Store boot timing information in the OS device tree"
depends on BOOTSTAGE
help
Stash the bootstage information in the FDT. A root 'bootstage'
node is created with each bootstage id as a child. Each child
has a 'name' property and either 'mark' containing the
mark time in microseconds, or 'accum' containing the
accumulated time for that bootstage id in microseconds.
For example:
bootstage {
154 {
name = "board_init_f";
mark = <3575678>;
};
170 {
name = "lcd";
accum = <33482>;
};
};
Code in the Linux kernel can find this in /proc/devicetree.
config BOOTSTAGE_STASH
bool "Stash the boot timing information in memory before booting OS"
depends on BOOTSTAGE
help
Some OSes do not support device tree. Bootstage can instead write
the boot timing information in a binary format at a given address.
This happens through a call to bootstage_stash(), typically in
the CPU's cleanup_before_linux() function. You can use the
'bootstage stash' and 'bootstage unstash' commands to do this on
the command line.
config BOOTSTAGE_STASH_ADDR
hex "Address to stash boot timing information"
default 0
help
Provide an address which will not be overwritten by the OS when it
starts, so that it can read this information when ready.
config BOOTSTAGE_STASH_SIZE
hex "Size of boot timing stash region"
default 4096
help
This should be large enough to hold the bootstage stash. A value of
4096 (4KiB) is normally plenty.
endmenu
menu "Boot media"
config NOR_BOOT
bool "Support for booting from NOR flash"
depends on NOR
help
Enabling this will make a U-Boot binary that is capable of being
booted via NOR. In this case we will enable certain pinmux early
as the ROM only partially sets up pinmux. We also default to using
NOR for environment.
config NAND_BOOT
bool "Support for booting from NAND flash"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via NAND flash. This is not a must, some SoCs need this,
some not.
config ONENAND_BOOT
bool "Support for booting from ONENAND"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via ONENAND. This is not a must, some SoCs need this,
some not.
config QSPI_BOOT
bool "Support for booting from QSPI flash"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via QSPI flash. This is not a must, some SoCs need this,
some not.
config SATA_BOOT
bool "Support for booting from SATA"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via SATA. This is not a must, some SoCs need this,
some not.
config SD_BOOT
bool "Support for booting from SD/EMMC"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via SD/EMMC. This is not a must, some SoCs need this,
some not.
config SPI_BOOT
bool "Support for booting from SPI flash"
default n
help
Enabling this will make a U-Boot binary that is capable of being
booted via SPI flash. This is not a must, some SoCs need this,
some not.
endmenu
menu "Environment"
if ARCH_SUNXI
choice
prompt "Environment Device"
default ENV_IS_IN_MMC if ARCH_SUNXI
config ENV_IS_IN_MMC
bool "Environment in an MMC device"
depends on CMD_MMC
help
Define this if you have an MMC device which you want to use for the
environment.
config ENV_IS_IN_NAND
bool "Environment in a NAND device"
depends on CMD_NAND
help
Define this if you have a NAND device which you want to use for the
environment.
config ENV_IS_IN_UBI
bool "Environment in a UBI volume"
depends on CMD_UBI
depends on CMD_MTDPARTS
help
Define this if you have a UBI volume which you want to use for the
environment.
config ENV_IS_NOWHERE
bool "Environment is not stored"
help
Define this if you don't want to or can't have an environment stored
on a storage medium
endchoice
config ENV_OFFSET
hex "Environment Offset"
depends on !ENV_IS_IN_UBI
depends on !ENV_IS_NOWHERE
default 0x88000 if ARCH_SUNXI
help
Offset from the start of the device (or partition)
config ENV_SIZE
hex "Environment Size"
depends on !ENV_IS_NOWHERE
default 0x20000 if ARCH_SUNXI
help
Size of the environment storage area
config ENV_UBI_PART
string "UBI partition name"
depends on ENV_IS_IN_UBI
help
MTD partition containing the UBI device
config ENV_UBI_VOLUME
string "UBI volume name"
depends on ENV_IS_IN_UBI
help
Name of the volume that you want to store the environment in.
endif
endmenu
config BOOTDELAY
int "delay in seconds before automatically booting"
default 2
depends on AUTOBOOT
help
Delay before automatically running bootcmd;
set to 0 to autoboot with no delay, but you can stop it by key input.
set to -1 to disable autoboot.
set to -2 to autoboot with no delay and not check for abort
See doc/README.autoboot for details.
menu "Console"
config MENU
bool
help
This is the library functionality to provide a text-based menu of
choices for the user to make choices with.
config CONSOLE_RECORD
bool "Console recording"
help
This provides a way to record console output (and provide console
input) through circular buffers. This is mostly useful for testing.
Console output is recorded even when the console is silent.
To enable console recording, call console_record_reset_enable()
from your code.
config CONSOLE_RECORD_OUT_SIZE
hex "Output buffer size"
depends on CONSOLE_RECORD
default 0x400 if CONSOLE_RECORD
help
Set the size of the console output buffer. When this fills up, no
more data will be recorded until some is removed. The buffer is
allocated immediately after the malloc() region is ready.
config CONSOLE_RECORD_IN_SIZE
hex "Input buffer size"
depends on CONSOLE_RECORD
default 0x100 if CONSOLE_RECORD
help
Set the size of the console input buffer. When this contains data,
tstc() and getc() will use this in preference to real device input.
The buffer is allocated immediately after the malloc() region is
ready.
config IDENT_STRING
string "Board specific string to be added to uboot version string"
help
This options adds the board specific name to u-boot version.
config SILENT_CONSOLE
bool "Support a silent console"
help
This option allows the console to be silenced, meaning that no
output will appear on the console devices. This is controlled by
setting the environment vaariable 'silent' to a non-empty value.
Note this also silences the console when booting Linux.
When the console is set up, the variable is checked, and the
GD_FLG_SILENT flag is set. Changing the environment variable later
will update the flag.
config SILENT_U_BOOT_ONLY
bool "Only silence the U-Boot console"
depends on SILENT_CONSOLE
help
Normally when the U-Boot console is silenced, Linux's console is
also silenced (assuming the board boots into Linux). This option
allows the linux console to operate normally, even if U-Boot's
is silenced.
config SILENT_CONSOLE_UPDATE_ON_SET
bool "Changes to the 'silent' environment variable update immediately"
depends on SILENT_CONSOLE
default y if SILENT_CONSOLE
help
When the 'silent' environment variable is changed, update the
console silence flag immediately. This allows 'setenv' to be used
to silence or un-silence the console.
The effect is that any change to the variable will affect the
GD_FLG_SILENT flag.
config SILENT_CONSOLE_UPDATE_ON_RELOC
bool "Allow flags to take effect on relocation"
depends on SILENT_CONSOLE
help
In some cases the environment is not available until relocation
(e.g. NAND). This option makes the value of the 'silent'
environment variable take effect at relocation.
config PRE_CONSOLE_BUFFER
bool "Buffer characters before the console is available"
help
Prior to the console being initialised (i.e. serial UART
initialised etc) all console output is silently discarded.
Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
buffer any console messages prior to the console being
initialised to a buffer. The buffer is a circular buffer, so
if it overflows, earlier output is discarded.
Note that this is not currently supported in SPL. It would be
useful to be able to share the pre-console buffer with SPL.
config PRE_CON_BUF_SZ
int "Sets the size of the pre-console buffer"
depends on PRE_CONSOLE_BUFFER
default 4096
help
The size of the pre-console buffer affects how much console output
can be held before it overflows and starts discarding earlier
output. Normally there is very little output at this early stage,
unless debugging is enabled, so allow enough for ~10 lines of
text.
This is a useful feature if you are using a video console and
want to see the full boot output on the console. Without this
option only the post-relocation output will be displayed.
config PRE_CON_BUF_ADDR
hex "Address of the pre-console buffer"
depends on PRE_CONSOLE_BUFFER
default 0x2f000000 if ARCH_SUNXI && MACH_SUN9I
default 0x4f000000 if ARCH_SUNXI && !MACH_SUN9I
help
This sets the start address of the pre-console buffer. This must
be in available memory and is accessed before relocation and
possibly before DRAM is set up. Therefore choose an address
carefully.
We should consider removing this option and allocating the memory
in board_init_f_init_reserve() instead.
config CONSOLE_MUX
bool "Enable console multiplexing"
default y if DM_VIDEO || VIDEO || LCD
help
This allows multiple devices to be used for each console 'file'.
For example, stdout can be set to go to serial and video.
Similarly, stdin can be set to come from serial and keyboard.
Input can be provided from either source. Console multiplexing
adds a small amount of size to U-Boot. Changes to the environment
variables stdout, stdin and stderr will take effect immediately.
config SYS_CONSOLE_IS_IN_ENV
bool "Select console devices from the environment"
default y if CONSOLE_MUX
help
This allows multiple input/output devices to be set at boot time.
For example, if stdout is set to "serial,video" then output will
be sent to both the serial and video devices on boot. The
environment variables can be updated after boot to change the
input/output devices.
config SYS_CONSOLE_OVERWRITE_ROUTINE
bool "Allow board control over console overwriting"
help
If this is enabled, and the board-specific function
overwrite_console() returns 1, the stdin, stderr and stdout are
switched to the serial port, else the settings in the environment
are used. If this is not enabled, the console will not be switched
to serial.
config SYS_CONSOLE_ENV_OVERWRITE
bool "Update environment variables during console init"
help
The console environment variables (stdout, stdin, stderr) can be
used to determine the correct console devices on start-up. This
option writes the console devices to these variables on console
start-up (after relocation). This causes the environment to be
updated to match the console devices actually chosen.
config SYS_CONSOLE_INFO_QUIET
bool "Don't display the console devices on boot"
help
Normally U-Boot displays the current settings for stdout, stdin
and stderr on boot when the post-relocation console is set up.
Enable this option to supress this output. It can be obtained by
calling stdio_print_current_devices() from board code.
config SYS_STDIO_DEREGISTER
bool "Allow deregistering stdio devices"
default y if USB_KEYBOARD
help
Generally there is no need to deregister stdio devices since they
are never deactivated. But if a stdio device is used which can be
removed (for example a USB keyboard) then this option can be
enabled to ensure this is handled correctly.
endmenu
config DEFAULT_FDT_FILE
string "Default fdt file"
help
This option is used to set the default fdt file to boot OS.
config VERSION_VARIABLE
bool "add U-Boot environment variable vers"
default n
help
If this variable is defined, an environment variable
named "ver" is created by U-Boot showing the U-Boot
version as printed by the "version" command.
Any change to this variable will be reverted at the
next reset.
config BOARD_LATE_INIT
bool
help
Sometimes board require some initialization code that might
require once the actual init done, example saving board specific env,
boot-modes etc. which eventually done at late.
So this config enable the late init code with the help of board_late_init
function which should defined on respective boards.
config DISPLAY_CPUINFO
bool "Display information about the CPU during start up"
default y if ARM || NIOS2 || X86 || XTENSA || MPC5xxx
help
Display information about the CPU that U-Boot is running on
when U-Boot starts up. The function print_cpuinfo() is called
to do this.
config DISPLAY_BOARDINFO
bool "Display information about the board during start up"
default y if ARM || M68K || MIPS || PPC || XTENSA
help
Display information about the board that U-Boot is running on
when U-Boot starts up. The board function checkboard() is called
to do this.
menu "Start-up hooks"
config ARCH_EARLY_INIT_R
bool "Call arch-specific init soon after relocation"
default y if X86
help
With this option U-Boot will call arch_early_init_r() soon after
relocation. Driver model is running by this point, and the cache
is on. Note that board_early_init_r() is called first, if
enabled. This can be used to set up architecture-specific devices.
config ARCH_MISC_INIT
bool "Call arch-specific init after relocation, when console is ready"
help
With this option U-Boot will call arch_misc_init() after
relocation to allow miscellaneous arch-dependent initialisation
to be performed. This function should be defined by the board
and will be called after the console is set up, after relocaiton.
config BOARD_EARLY_INIT_F
bool "Call board-specific init before relocation"
default y if X86
help
Some boards need to perform initialisation as soon as possible
after boot. With this option, U-Boot calls board_early_init_f()
after driver model is ready in the pre-relocation init sequence.
Note that the normal serial console is not yet set up, but the
debug UART will be available if enabled.
endmenu
source "common/spl/Kconfig"
|