'Sane' compilers will generate smaller code if
CONFIG_PRE_CON_BUF_SZ is a power of 2
-- Boot Delay: CONFIG_BOOTDELAY - in seconds
- Delay before automatically booting the default image;
- set to -1 to disable autoboot.
- set to -2 to autoboot with no delay and not check for abort
- (even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
-
- See doc/README.autoboot for these options that
- work with CONFIG_BOOTDELAY. None are required.
- CONFIG_BOOT_RETRY_TIME
- CONFIG_BOOT_RETRY_MIN
- CONFIG_AUTOBOOT_KEYED
- CONFIG_AUTOBOOT_PROMPT
- CONFIG_AUTOBOOT_DELAY_STR
- CONFIG_AUTOBOOT_STOP_STR
- CONFIG_ZERO_BOOTDELAY_CHECK
- CONFIG_RESET_TO_RETRY
-
- Autoboot Command:
CONFIG_BOOTCOMMAND
Only needed when CONFIG_BOOTDELAY is enabled;
CONFIG_CMD_ECHO echo arguments
CONFIG_CMD_EDITENV edit env variable
CONFIG_CMD_EEPROM * EEPROM read/write support
+ CONFIG_CMD_EEPROM_LAYOUT* EEPROM layout aware commands
CONFIG_CMD_ELF * bootelf, bootvx
CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
CONFIG_CMD_ENV_FLAGS * display details about env flags
CONFIG_CMD_RUN run command in env variable
CONFIG_CMD_SANDBOX * sb command to access sandbox features
CONFIG_CMD_SAVES * save S record dump
- CONFIG_CMD_SCSI * SCSI Support
+ CONFIG_SCSI * SCSI Support
CONFIG_CMD_SDRAM * print SDRAM configuration information
(requires CONFIG_CMD_I2C)
CONFIG_CMD_SETGETDCR Support for DCR Register access
XXX - this list needs to get updated!
+- Removal of commands
+ If no commands are needed to boot, you can disable
+ CONFIG_CMDLINE to remove them. In this case, the command line
+ will not be available, and when U-Boot wants to execute the
+ boot command (on start-up) it will call board_run_command()
+ instead. This can reduce image size significantly for very
+ simple boot procedures.
+
- Regular expression support:
CONFIG_REGEX
If this variable is defined, U-Boot is linked against
CONFIG_MTD_PARTITIONS Memory Technology Device partition table.
If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
- CONFIG_CMD_SCSI) you must configure support for at
+ CONFIG_SCSI) you must configure support for at
least one non-MTD partition type as well.
- IDE Reset method:
The DIU driver will look for the 'video-mode' environment
variable, and if defined, enable the DIU as a console during
- boot. See the documentation file README.video for a
+ boot. See the documentation file doc/README.video for a
description of this variable.
- LCD Support: CONFIG_LCD
If this option is set, then U-Boot will prevent the environment
variable "splashimage" from being set to a problematic address
- (see README.displaying-bmps).
+ (see doc/README.displaying-bmps).
This option is useful for targets where, due to alignment
restrictions, an improperly aligned BMP image will cause a data
abort. If you think you will not have problems with unaligned
will set it back to normal. This command currently
supports i.MX53 and i.MX6.
-- Signing support:
- CONFIG_RSA
-
- This enables the RSA algorithm used for FIT image verification
- in U-Boot. See doc/uImage.FIT/signature.txt for more information.
-
- The Modular Exponentiation algorithm in RSA is implemented using
- driver model. So CONFIG_DM needs to be enabled by default for this
- library to function.
-
- The signing part is build into mkimage regardless of this
- option. The software based modular exponentiation is built into
- mkimage irrespective of this option.
-
- bootcount support:
CONFIG_BOOTCOUNT_LIMIT
enabled per default for backward compatibility.
- FIT image support:
- CONFIG_FIT
- Enable support for the FIT uImage format.
-
- CONFIG_FIT_BEST_MATCH
- When no configuration is explicitly selected, default to the
- one whose fdt's compatibility field best matches that of
- U-Boot itself. A match is considered "best" if it matches the
- most specific compatibility entry of U-Boot's fdt's root node.
- The order of entries in the configuration's fdt is ignored.
-
- CONFIG_FIT_SIGNATURE
- This option enables signature verification of FIT uImages,
- using a hash signed and verified using RSA. If
- CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
- hashing is available using hardware, RSA library will use it.
- See doc/uImage.FIT/signature.txt for more details.
-
- WARNING: When relying on signed FIT images with required
- signature check the legacy image format is default
- disabled. If a board need legacy image format support
- enable this through CONFIG_IMAGE_FORMAT_LEGACY
-
CONFIG_FIT_DISABLE_SHA256
Supporting SHA256 hashes has quite an impact on binary size.
For constrained systems sha256 hash support can be disabled
with this option.
+ TODO(sjg@chromium.org): Adjust this option to be positive,
+ and move it to Kconfig
+
- Standalone program support:
CONFIG_STANDALONE_LOAD_ADDR
consider that a completely unreadable NAND block is bad,
and thus should be skipped silently.
+ CONFIG_SPL_ABORT_ON_RAW_IMAGE
+ When defined, SPL will proceed to another boot method
+ if the image it has loaded does not have a signature.
+
CONFIG_SPL_RELOC_STACK
Adress of the start of the stack SPL will use after
relocation. If unspecified, this is equal to
If defined, don't allow the -f switch to env set override variable
access flags.
-- CONFIG_SYS_GENERIC_BOARD
- This selects the architecture-generic board system instead of the
- architecture-specific board files. It is intended to move boards
- to this new framework over time. Defining this will disable the
- arch/foo/lib/board.c file and use common/board_f.c and
- common/board_r.c instead. To use this option your architecture
- must support it (i.e. must select HAVE_GENERIC_BOARD in arch/Kconfig).
- If you find problems enabling this option on your board please report
- the problem and send patches!
-
- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
This is set by OMAP boards for the max time that reset should
be asserted. See doc/README.omap-reset-time for details on how
other boot loader or by a debugger which performs
these initializations itself.
+- CONFIG_SKIP_LOWLEVEL_INIT_ONLY
+ [ARM926EJ-S only] This allows just the call to lowlevel_init()
+ to be skipped. The normal CPU15 init (such as enabling the
+ instruction cache) is still performed.
+
- CONFIG_SPL_BUILD
Modifies the behaviour of start.S when compiling a loader
that is executed before the actual U-Boot. E.g. when
Ethernet is encapsulated/received over 802.1q
VLAN tagged frames.
+ bootpretryperiod - Period during which BOOTP/DHCP sends retries.
+ Unsigned value, in milliseconds. If not set, the period will
+ be either the default (28000), or a value based on
+ CONFIG_NET_RETRY_COUNT, if defined. This value has
+ precedence over the valu based on CONFIG_NET_RETRY_COUNT.
+
The following image location variables contain the location of images
used in booting. The "Image" column gives the role of the image and is
not an environment variable name. The other columns are environment
projects / people / ms / u-boot.git / blobdiff