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- // -*- mode:doc; -*-
- // vim: set syntax=asciidoc:
- [[customize-store-buildroot-config]]
- === Storing the Buildroot configuration
- The Buildroot configuration can be stored using the command
- +make savedefconfig+.
- This strips the Buildroot configuration down by removing configuration
- options that are at their default value. The result is stored in a file
- called +defconfig+. If you want to save it in another place, change the
- +BR2_DEFCONFIG+ option in the Buildroot configuration itself, or call
- make with +make savedefconfig BR2_DEFCONFIG=<path-to-defconfig>+.
- The recommended place to store this defconfig is
- +configs/<boardname>_defconfig+. If you follow this recommendation, the
- configuration will be listed in +make help+ and can be set again by
- running +make <boardname>_defconfig+.
- Alternatively, you can copy the file to any other place and rebuild with
- +make defconfig BR2_DEFCONFIG=<path-to-defconfig-file>+.
- [[customize-store-package-config]]
- === Storing the configuration of other components
- The configuration files for BusyBox, the Linux kernel, Barebox, U-Boot
- and uClibc should be stored as well if changed. For each of these
- components, a Buildroot configuration option exists to point to an input
- configuration file, e.g. +BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE+. To store
- their configuration, set these configuration options to a path where you
- want to save the configuration files, and then use the helper targets
- described below to actually store the configuration.
- As explained in xref:customize-dir-structure[], the recommended path to
- store these configuration files is
- +board/<company>/<boardname>/foo.config+.
- Make sure that you create a configuration file 'before' changing
- the +BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE+ etc. options. Otherwise,
- Buildroot will try to access this config file, which doesn't exist
- yet, and will fail. You can create the configuration file by running
- +make linux-menuconfig+ etc.
- Buildroot provides a few helper targets to make the saving of
- configuration files easier.
- * +make linux-update-defconfig+ saves the linux configuration to the
- path specified by +BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE+. It
- simplifies the config file by removing default values. However,
- this only works with kernels starting from 2.6.33. For earlier
- kernels, use +make linux-update-config+.
- * +make busybox-update-config+ saves the busybox configuration to the
- path specified by +BR2_PACKAGE_BUSYBOX_CONFIG+.
- * +make uclibc-update-config+ saves the uClibc configuration to the
- path specified by +BR2_UCLIBC_CONFIG+.
- * +make barebox-update-defconfig+ saves the barebox configuration to the
- path specified by +BR2_TARGET_BAREBOX_CUSTOM_CONFIG_FILE+.
- * +make uboot-update-defconfig+ saves the U-Boot configuration to the
- path specified by +BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE+.
- * For at91bootstrap3, no helper exists so you have to copy the config
- file manually to +BR2_TARGET_AT91BOOTSTRAP3_CUSTOM_CONFIG_FILE+.
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