4 bool "Environment is not stored"
5 default y if !ENV_IS_IN_EEPROM && !ENV_IS_IN_EXT4 && \
6 !ENV_IS_IN_FAT && !ENV_IS_IN_FLASH && \
7 !ENV_IS_IN_MMC && !ENV_IS_IN_NAND && \
8 !ENV_IS_IN_NVRAM && !ENV_IS_IN_ONENAND && \
9 !ENV_IS_IN_REMOTE && !ENV_IS_IN_SPI_FLASH && \
12 Define this if you don't want to or can't have an environment stored
13 on a storage medium. In this case the environment will still exist
14 while U-Boot is running, but once U-Boot exits it will not be
15 stored. U-Boot will therefore always start up with a default
18 config ENV_IS_IN_EEPROM
19 bool "Environment in EEPROM"
20 depends on !CHAIN_OF_TRUST
22 Use this if you have an EEPROM or similar serial access
23 device and a driver for it.
28 These two #defines specify the offset and size of the
29 environment area within the total memory of your EEPROM.
31 Note that we consider the length of the address field to
32 still be one byte because the extra address bits are hidden
35 - CONFIG_ENV_EEPROM_IS_ON_I2C
36 define this, if you have I2C and SPI activated, and your
37 EEPROM, which holds the environment, is on the I2C bus.
39 - CONFIG_I2C_ENV_EEPROM_BUS
40 if you have an Environment on an EEPROM reached over
41 I2C muxes, you can define here, how to reach this
44 #define CONFIG_I2C_ENV_EEPROM_BUS 1
46 EEPROM which holds the environment, is reached over
47 a pca9547 i2c mux with address 0x70, channel 3.
50 bool "Environment is in a FAT filesystem"
51 depends on !CHAIN_OF_TRUST
52 default y if ARCH_BCM283X
53 default y if ARCH_SUNXI && MMC
54 default y if MMC_OMAP_HS && TI_COMMON_CMD_OPTIONS
58 Define this if you want to use the FAT file system for the environment.
61 bool "Environment is in a EXT4 filesystem"
62 depends on !CHAIN_OF_TRUST
65 Define this if you want to use the EXT4 file system for the environment.
67 config ENV_IS_IN_FLASH
68 bool "Environment in flash memory"
69 depends on !CHAIN_OF_TRUST
70 default y if ARCH_CINTEGRATOR
71 default y if ARCH_INTEGRATOR_CP
72 default y if M548x || M547x || M5282 || MCF547x_8x
73 default y if MCF532x || MCF52x2
74 default y if MPC86xx || MPC83xx
75 default y if ARCH_MPC8572 || ARCH_MPC8548 || ARCH_MPC8641
76 default y if SH && !CPU_SH4
78 Define this if you have a flash device which you want to use for the
81 a) The environment occupies one whole flash sector, which is
82 "embedded" in the text segment with the U-Boot code. This
83 happens usually with "bottom boot sector" or "top boot
84 sector" type flash chips, which have several smaller
85 sectors at the start or the end. For instance, such a
86 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
87 such a case you would place the environment in one of the
88 4 kB sectors - with U-Boot code before and after it. With
89 "top boot sector" type flash chips, you would put the
90 environment in one of the last sectors, leaving a gap
91 between U-Boot and the environment.
95 Offset of environment data (variable area) to the
96 beginning of flash memory; for instance, with bottom boot
97 type flash chips the second sector can be used: the offset
98 for this sector is given here.
100 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
104 This is just another way to specify the start address of
105 the flash sector containing the environment (instead of
108 CONFIG_ENV_SECT_SIZE:
110 Size of the sector containing the environment.
113 b) Sometimes flash chips have few, equal sized, BIG sectors.
114 In such a case you don't want to spend a whole sector for
119 If you use this in combination with CONFIG_ENV_IS_IN_FLASH
120 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
121 of this flash sector for the environment. This saves
122 memory for the RAM copy of the environment.
124 It may also save flash memory if you decide to use this
125 when your environment is "embedded" within U-Boot code,
126 since then the remainder of the flash sector could be used
127 for U-Boot code. It should be pointed out that this is
128 STRONGLY DISCOURAGED from a robustness point of view:
129 updating the environment in flash makes it always
130 necessary to erase the WHOLE sector. If something goes
131 wrong before the contents has been restored from a copy in
132 RAM, your target system will be dead.
134 CONFIG_ENV_ADDR_REDUND
136 These settings describe a second storage area used to hold
137 a redundant copy of the environment data, so that there is
138 a valid backup copy in case there is a power failure during
139 a "saveenv" operation.
141 BE CAREFUL! Any changes to the flash layout, and some changes to the
142 source code will make it necessary to adapt <board>/u-boot.lds*
146 bool "Environment in an MMC device"
147 depends on !CHAIN_OF_TRUST
149 default y if ARCH_EXYNOS4
150 default y if MX6SX || MX7D
151 default y if TEGRA30 || TEGRA124
152 default y if TEGRA_ARMV8_COMMON
154 Define this if you have an MMC device which you want to use for the
157 CONFIG_SYS_MMC_ENV_DEV:
159 Specifies which MMC device the environment is stored in.
161 CONFIG_SYS_MMC_ENV_PART (optional):
163 Specifies which MMC partition the environment is stored in. If not
164 set, defaults to partition 0, the user area. Common values might be
165 1 (first MMC boot partition), 2 (second MMC boot partition).
170 These two #defines specify the offset and size of the environment
171 area within the specified MMC device.
173 If offset is positive (the usual case), it is treated as relative to
174 the start of the MMC partition. If offset is negative, it is treated
175 as relative to the end of the MMC partition. This can be useful if
176 your board may be fitted with different MMC devices, which have
177 different sizes for the MMC partitions, and you always want the
178 environment placed at the very end of the partition, to leave the
179 maximum possible space before it, to store other data.
181 These two values are in units of bytes, but must be aligned to an
184 CONFIG_ENV_OFFSET_REDUND (optional):
186 Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
187 hold a redundant copy of the environment data. This provides a
188 valid backup copy in case the other copy is corrupted, e.g. due
189 to a power failure during a "saveenv" operation.
191 This value may also be positive or negative; this is handled in the
192 same way as CONFIG_ENV_OFFSET.
194 This value is also in units of bytes, but must also be aligned to
195 an MMC sector boundary.
197 config ENV_IS_IN_NAND
198 bool "Environment in a NAND device"
199 depends on !CHAIN_OF_TRUST
201 Define this if you have a NAND device which you want to use for the
207 These two #defines specify the offset and size of the environment
208 area within the first NAND device. CONFIG_ENV_OFFSET must be
209 aligned to an erase block boundary.
211 - CONFIG_ENV_OFFSET_REDUND (optional):
213 This setting describes a second storage area of CONFIG_ENV_SIZE
214 size used to hold a redundant copy of the environment data, so
215 that there is a valid backup copy in case there is a power failure
216 during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be
217 aligned to an erase block boundary.
219 - CONFIG_ENV_RANGE (optional):
221 Specifies the length of the region in which the environment
222 can be written. This should be a multiple of the NAND device's
223 block size. Specifying a range with more erase blocks than
224 are needed to hold CONFIG_ENV_SIZE allows bad blocks within
225 the range to be avoided.
227 - CONFIG_ENV_OFFSET_OOB (optional):
229 Enables support for dynamically retrieving the offset of the
230 environment from block zero's out-of-band data. The
231 "nand env.oob" command can be used to record this offset.
232 Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
233 using CONFIG_ENV_OFFSET_OOB.
235 config ENV_IS_IN_NVRAM
236 bool "Environment in a non-volatile RAM"
237 depends on !CHAIN_OF_TRUST
239 Define this if you have some non-volatile memory device
240 (NVRAM, battery buffered SRAM) which you want to use for the
246 These two #defines are used to determine the memory area you
247 want to use for environment. It is assumed that this memory
248 can just be read and written to, without any special
251 config ENV_IS_IN_ONENAND
252 bool "Environment is in OneNAND"
253 depends on !CHAIN_OF_TRUST
255 Define this if you want to put your local device's environment in
261 These two #defines are used to determine the device range you
262 want to use for environment. It is assumed that this memory
263 can just be read and written to, without any special
266 config ENV_IS_IN_REMOTE
267 bool "Environment is in remote memory space"
268 depends on !CHAIN_OF_TRUST
270 Define this if you have a remote memory space which you
271 want to use for the local device's environment.
276 These two #defines specify the address and size of the
277 environment area within the remote memory space. The
278 local device can get the environment from remote memory
279 space by SRIO or PCIE links.
281 config ENV_IS_IN_SPI_FLASH
282 bool "Environment is in SPI flash"
283 depends on !CHAIN_OF_TRUST && SPI
284 default y if ARMADA_XP
285 default y if INTEL_BAYTRAIL
286 default y if INTEL_BRASWELL
287 default y if INTEL_BROADWELL
288 default y if NORTHBRIDGE_INTEL_IVYBRIDGE
289 default y if INTEL_QUARK
290 default y if INTEL_QUEENSBAY
292 Define this if you have a SPI Flash memory device which you
293 want to use for the environment.
298 These two #defines specify the offset and size of the
299 environment area within the SPI Flash. CONFIG_ENV_OFFSET must be
300 aligned to an erase sector boundary.
302 - CONFIG_ENV_SECT_SIZE:
304 Define the SPI flash's sector size.
306 - CONFIG_ENV_OFFSET_REDUND (optional):
308 This setting describes a second storage area of CONFIG_ENV_SIZE
309 size used to hold a redundant copy of the environment data, so
310 that there is a valid backup copy in case there is a power failure
311 during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be
312 aligned to an erase sector boundary.
314 config USE_ENV_SPI_BUS
315 bool "SPI flash bus for environment"
316 depends on ENV_IS_IN_SPI_FLASH
318 Force the SPI bus for environment.
319 If not defined, use CONFIG_SF_DEFAULT_BUS.
322 int "Value of SPI flash bus for environment"
323 depends on USE_ENV_SPI_BUS
325 Value the SPI bus and chip select for environment.
327 config USE_ENV_SPI_CS
328 bool "SPI flash chip select for environment"
329 depends on ENV_IS_IN_SPI_FLASH
331 Force the SPI chip select for environment.
332 If not defined, use CONFIG_SF_DEFAULT_CS.
335 int "Value of SPI flash chip select for environment"
336 depends on USE_ENV_SPI_CS
338 Value of the SPI chip select for environment.
340 config USE_ENV_SPI_MAX_HZ
341 bool "SPI flash max frequency for environment"
342 depends on ENV_IS_IN_SPI_FLASH
344 Force the SPI max work clock for environment.
345 If not defined, use CONFIG_SF_DEFAULT_SPEED.
347 config ENV_SPI_MAX_HZ
348 int "Value of SPI flash max frequency for environment"
349 depends on USE_ENV_SPI_MAX_HZ
351 Value of the SPI max work clock for environment.
353 config USE_ENV_SPI_MODE
354 bool "SPI flash mode for environment"
355 depends on ENV_IS_IN_SPI_FLASH
357 Force the SPI work mode for environment.
360 hex "Value of SPI flash work mode for environment"
361 depends on USE_ENV_SPI_MODE
363 Value of the SPI work mode for environment.
364 See include/spi.h for value.
367 bool "Environment in a UBI volume"
368 depends on !CHAIN_OF_TRUST
370 Define this if you have an UBI volume that you want to use for the
371 environment. This has the benefit of wear-leveling the environment
372 accesses, which is important on NAND.
374 - CONFIG_ENV_UBI_PART:
376 Define this to a string that is the mtd partition containing the UBI.
378 - CONFIG_ENV_UBI_VOLUME:
380 Define this to the name of the volume that you want to store the
383 - CONFIG_ENV_UBI_VOLUME_REDUND:
385 Define this to the name of another volume to store a second copy of
386 the environment in. This will enable redundant environments in UBI.
387 It is assumed that both volumes are in the same MTD partition.
389 config SYS_REDUNDAND_ENVIRONMENT
390 bool "Enable redundant environment support"
391 depends on ENV_IS_IN_EEPROM || ENV_IS_IN_FLASH || ENV_IS_IN_MMC || \
392 ENV_IS_IN_NAND || ENV_IS_IN_SPI_FLASH || ENV_IS_IN_UBI
394 Normally, the environemt is stored in a single location. By
395 selecting this option, you can then define where to hold a redundant
396 copy of the environment data, so that there is a valid backup copy in
397 case there is a power failure during a "saveenv" operation.
399 config ENV_FAT_INTERFACE
400 string "Name of the block device for the environment"
401 depends on ENV_IS_IN_FAT
402 default "mmc" if ARCH_SUNXI
403 default "mmc" if TI_COMMON_CMD_OPTIONS || ARCH_ZYNQMP || ARCH_AT91
405 Define this to a string that is the name of the block device.
407 config ENV_FAT_DEVICE_AND_PART
408 string "Device and partition for where to store the environemt in FAT"
409 depends on ENV_IS_IN_FAT
410 default "0:1" if TI_COMMON_CMD_OPTIONS
411 default "0:auto" if ARCH_ZYNQMP
412 default "0:auto" if ARCH_SUNXI && MMC_SUNXI_SLOT_EXTRA = -1
413 default "1:auto" if ARCH_SUNXI && MMC_SUNXI_SLOT_EXTRA != -1
414 default "0" if ARCH_AT91
416 Define this to a string to specify the partition of the device. It can
419 "D:P", "D:0", "D", "D:" or "D:auto" (D, P are integers. And P >= 1)
420 - "D:P": device D partition P. Error occurs if device D has no
423 - "D" or "D:": device D partition 1 if device D has partition
424 table, or the whole device D if has no partition
426 - "D:auto": first partition in device D with bootable flag set.
427 If none, first valid partition in device D. If no
428 partition table then means device D.
431 string "Name of the FAT file to use for the environment"
432 depends on ENV_IS_IN_FAT
435 It's a string of the FAT file name. This file use to store the
438 config ENV_EXT4_INTERFACE
439 string "Name of the block device for the environment"
440 depends on ENV_IS_IN_EXT4
442 Define this to a string that is the name of the block device.
444 config ENV_EXT4_DEVICE_AND_PART
445 string "Device and partition for where to store the environemt in EXT4"
446 depends on ENV_IS_IN_EXT4
448 Define this to a string to specify the partition of the device. It can
451 "D:P", "D:0", "D", "D:" or "D:auto" (D, P are integers. And P >= 1)
452 - "D:P": device D partition P. Error occurs if device D has no
455 - "D" or "D:": device D partition 1 if device D has partition
456 table, or the whole device D if has no partition
458 - "D:auto": first partition in device D with bootable flag set.
459 If none, first valid partition in device D. If no
460 partition table then means device D.
463 string "Name of the EXT4 file to use for the environment"
464 depends on ENV_IS_IN_EXT4
467 It's a string of the EXT4 file name. This file use to store the
468 environment (explicit path to the file)
471 hex "Environment address"
472 depends on ENV_IS_IN_FLASH || ENV_IS_IN_NVRAM || ENV_IS_IN_ONENAND || \
473 ENV_IS_IN_REMOTE || ENV_IS_IN_SPI_FLASH
474 default 0x0 if ENV_IS_IN_SPI_FLASH
476 Offset from the start of the device (or partition)
478 config ENV_ADDR_REDUND
479 hex "Redundant environment address"
480 depends on ENV_IS_IN_FLASH && SYS_REDUNDAND_ENVIRONMENT
482 Offset from the start of the device (or partition) of the redundant
483 environment location.
486 hex "Environment offset"
487 depends on ENV_IS_IN_EEPROM || ENV_IS_IN_MMC || ENV_IS_IN_NAND || \
489 default 0x3f8000 if ARCH_ROCKCHIP
490 default 0x88000 if ARCH_SUNXI
491 default 0xE0000 if ARCH_ZYNQ
492 default 0x1E00000 if ARCH_ZYNQMP
493 default 0x7F40000 if ARCH_VERSAL
495 default 0x140000 if ARCH_AT91
496 default 0x260000 if ARCH_OMAP2PLUS
498 Offset from the start of the device (or partition)
500 config ENV_OFFSET_REDUND
501 hex "Redundant environment offset"
502 depends on (ENV_IS_IN_EEPROM || ENV_IS_IN_MMC || ENV_IS_IN_NAND || \
503 ENV_IS_IN_SPI_FLASH) && SYS_REDUNDAND_ENVIRONMENT
505 Offset from the start of the device (or partition) of the redundant
506 environment location.
509 hex "Environment Size"
510 default 0x40000 if ENV_IS_IN_SPI_FLASH && ARCH_ZYNQMP
511 default 0x20000 if ARCH_SUNXI || ARCH_ZYNQ || ARCH_OMAP2PLUS || ARCH_AT91
512 default 0x8000 if ARCH_ROCKCHIP || ARCH_ZYNQMP || ARCH_VERSAL
513 default 0x4000 if ARC
516 Size of the environment storage area
519 hex "Environment Sector-Size"
520 depends on ENV_IS_IN_FLASH || ENV_IS_IN_SPI_FLASH
521 default 0x40000 if ARCH_ZYNQMP || ARCH_VERSAL
522 default 0x20000 if ARCH_ZYNQ || ARCH_OMAP2PLUS || ARCH_AT91
524 Size of the sector containing the environment.
527 string "UBI partition name"
528 depends on ENV_IS_IN_UBI
530 MTD partition containing the UBI device
532 config ENV_UBI_VOLUME
533 string "UBI volume name"
534 depends on ENV_IS_IN_UBI
536 Name of the volume that you want to store the environment in.
538 config ENV_UBI_VOLUME_REDUND
539 string "UBI redundant volume name"
540 depends on ENV_IS_IN_UBI && SYS_REDUNDAND_ENVIRONMENT
542 Name of the redundant volume that you want to store the environment in.
544 config ENV_UBI_VID_OFFSET
545 int "ubi environment VID offset"
546 depends on ENV_IS_IN_UBI
549 UBI VID offset for environment. If 0, no custom VID offset is used.
551 config SYS_RELOC_GD_ENV_ADDR
552 bool "Relocate gd->en_addr"
554 Relocate the early env_addr pointer so we know it is not inside
555 the binary. Some systems need this and for the rest, it doesn't hurt.
557 config USE_DEFAULT_ENV_FILE
558 bool "Create default environment from file"
560 Normally, the default environment is automatically generated
561 based on the settings of various CONFIG_* options, as well
562 as the CONFIG_EXTRA_ENV_SETTINGS. By selecting this option,
563 you can instead define the entire default environment in an
566 config DEFAULT_ENV_FILE
567 string "Path to default environment file"
568 depends on USE_DEFAULT_ENV_FILE
570 The path containing the default environment. The format is
571 the same as accepted by the mkenvimage tool: lines
572 containing key=value pairs, blank lines and lines beginning
575 config ENV_VARS_UBOOT_RUNTIME_CONFIG
576 bool "Add run-time information to the environment"
578 Enable this in order to add variables describing certain
579 run-time determined information about the hardware to the
580 environment. These will be named board_name, board_rev.
583 config SPL_ENV_IS_NOWHERE
584 bool "SPL Environment is not stored"
585 default y if ENV_IS_NOWHERE
587 Similar to ENV_IS_NOWHERE, used for SPL environment.
589 config SPL_ENV_IS_IN_MMC
590 bool "SPL Environment in an MMC device"
591 depends on !SPL_ENV_IS_NOWHERE
592 depends on ENV_IS_IN_MMC
595 Similar to ENV_IS_IN_MMC, used for SPL environment.
597 config SPL_ENV_IS_IN_FAT
598 bool "SPL Environment is in a FAT filesystem"
599 depends on !SPL_ENV_IS_NOWHERE
600 depends on ENV_IS_IN_FAT
603 Similar to ENV_IS_IN_FAT, used for SPL environment.
605 config SPL_ENV_IS_IN_EXT4
606 bool "SPL Environment is in a EXT4 filesystem"
607 depends on !SPL_ENV_IS_NOWHERE
608 depends on ENV_IS_IN_EXT4
611 Similar to ENV_IS_IN_EXT4, used for SPL environment.
613 config SPL_ENV_IS_IN_NAND
614 bool "SPL Environment in a NAND device"
615 depends on !SPL_ENV_IS_NOWHERE
616 depends on ENV_IS_IN_NAND
619 Similar to ENV_IS_IN_NAND, used for SPL environment.
621 config SPL_ENV_IS_IN_SPI_FLASH
622 bool "SPL Environment is in SPI flash"
623 depends on !SPL_ENV_IS_NOWHERE
624 depends on ENV_IS_IN_SPI_FLASH
627 Similar to ENV_IS_IN_SPI_FLASH, used for SPL environment.
629 config SPL_ENV_IS_IN_FLASH
630 bool "SPL Environment in flash memory"
631 depends on !SPL_ENV_IS_NOWHERE
632 depends on ENV_IS_IN_FLASH
635 Similar to ENV_IS_IN_FLASH, used for SPL environment.
641 config TPL_ENV_IS_NOWHERE
642 bool "TPL Environment is not stored"
643 default y if ENV_IS_NOWHERE
645 Similar to ENV_IS_NOWHERE, used for TPL environment.
647 config TPL_ENV_IS_IN_MMC
648 bool "TPL Environment in an MMC device"
649 depends on !TPL_ENV_IS_NOWHERE
650 depends on ENV_IS_IN_MMC
653 Similar to ENV_IS_IN_MMC, used for TPL environment.
655 config TPL_ENV_IS_IN_FAT
656 bool "TPL Environment is in a FAT filesystem"
657 depends on !TPL_ENV_IS_NOWHERE
658 depends on ENV_IS_IN_FAT
661 Similar to ENV_IS_IN_FAT, used for TPL environment.
663 config TPL_ENV_IS_IN_EXT4
664 bool "TPL Environment is in a EXT4 filesystem"
665 depends on !TPL_ENV_IS_NOWHERE
666 depends on ENV_IS_IN_EXT4
669 Similar to ENV_IS_IN_EXT4, used for TPL environment.
671 config TPL_ENV_IS_IN_NAND
672 bool "TPL Environment in a NAND device"
673 depends on !TPL_ENV_IS_NOWHERE
674 depends on ENV_IS_IN_NAND
677 Similar to ENV_IS_IN_NAND, used for TPL environment.
679 config TPL_ENV_IS_IN_SPI_FLASH
680 bool "TPL Environment is in SPI flash"
681 depends on !TPL_ENV_IS_NOWHERE
682 depends on ENV_IS_IN_SPI_FLASH
685 Similar to ENV_IS_IN_SPI_FLASH, used for TPL environment.
687 config TPL_ENV_IS_IN_FLASH
688 bool "TPL Environment in flash memory"
689 depends on !TPL_ENV_IS_NOWHERE
690 depends on ENV_IS_IN_FLASH
693 Similar to ENV_IS_IN_FLASH, used for TPL environment.