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
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