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=== Quick guide to storing your project-specific customizations

Earlier in this chapter, the different methods for making
project-specific customizations have been described. This section will
now summarize all this by providing step-by-step instructions to storing your
project-specific customizations. Clearly, the steps that are not relevant to
your project can be skipped.

1. +make menuconfig+ to configure toolchain, packages and kernel.
1. +make linux-menuconfig+ to update the kernel config, similar for
   other configuration like busybox, uclibc, ...
1. +mkdir -p board/<manufacturer>/<boardname>+
1. Set the following options to +board/<manufacturer>/<boardname>/<package>.config+
   (as far as they are relevant):
   * +BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE+
   * +BR2_PACKAGE_BUSYBOX_CONFIG+
   * +BR2_UCLIBC_CONFIG+
   * +BR2_TARGET_AT91BOOTSTRAP3_CUSTOM_CONFIG_FILE+
   * +BR2_TARGET_BAREBOX_CUSTOM_CONFIG_FILE+
   * +BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE+
1. Write the configuration files:
   * +make linux-update-defconfig+
   * +make busybox-update-config+
   * +make uclibc-update-config+
   * +cp <output>/build/at91bootstrap3-*/.config
     board/<manufacturer>/<boardname>/at91bootstrap3.config+
   * +make barebox-update-defconfig+
   * +make uboot-update-defconfig+
1. Create +board/<manufacturer>/<boardname>/rootfs-overlay/+ and fill it
   with additional files you need on your rootfs, e.g.
   +board/<manufacturer>/<boardname>/rootfs-overlay/etc/inittab+.
   Set +BR2_ROOTFS_OVERLAY+
   to +board/<manufacturer>/<boardname>/rootfs-overlay+.
1. Create a post-build script
   +board/<manufacturer>/<boardname>/post_build.sh+. Set
   +BR2_ROOTFS_POST_BUILD_SCRIPT+ to
   +board/<manufacturer>/<boardname>/post_build.sh+
1. If additional setuid permissions have to be set or device nodes have
   to be created, create +board/<manufacturer>/<boardname>/device_table.txt+
   and add that path to +BR2_ROOTFS_DEVICE_TABLE+.
1. If additional user accounts have to be created, create
   +board/<manufacturer>/<boardname>/users_table.txt+ and add that path
   to +BR2_ROOTFS_USERS_TABLES+.
1. To add custom patches to certain packages, set +BR2_GLOBAL_PATCH_DIR+
   to +board/<manufacturer>/<boardname>/patches/+ and add your patches
   for each package in a subdirectory named after the package. Each
   patch should be called +<packagename>-<num>-<description>.patch+.
1. Specifically for the Linux kernel, there also exists the option
   +BR2_LINUX_KERNEL_PATCH+ with as main advantage that it can also
   download patches from a URL. If you do not need this,
   +BR2_GLOBAL_PATCH_DIR+ is preferred. U-Boot, Barebox, at91bootstrap
   and at91bootstrap3 also have separate options, but these do not
   provide any advantage over +BR2_GLOBAL_PATCH_DIR+ and will likely be
   removed in the future.
1. If you need to add project-specific packages, create
   +package/<manufacturer>/+ and place your packages in that
   directory. Create an overall +<manufacturer>.mk+ file that
   includes the +.mk+ files of all your packages. Create an overall
   +Config.in+ file that sources the +Config.in+ files of all your
   packages. Include this +Config.in+ file from Buildroot's
   +package/Config.in+ file.
1. +make savedefconfig+ to save the buildroot configuration.
1. +cp defconfig configs/<boardname>_defconfig+