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a6479d6058
external.desc must be present when using a br2-external tree. The documentation notes this later in the text, but the file is missing from the initial overview of files. Fixes bug #11481. Signed-off-by: Philipp Wagner <mail@philipp-wagner.com> Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
112 lines
3.6 KiB
Plaintext
112 lines
3.6 KiB
Plaintext
// -*- mode:doc; -*-
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// vim: set syntax=asciidoc:
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[[customize-dir-structure]]
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=== Recommended directory structure
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When customizing Buildroot for your project, you will be creating one or
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more project-specific files that need to be stored somewhere. While most
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of these files could be placed in _any_ location as their path is to be
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specified in the Buildroot configuration, the Buildroot developers
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recommend a specific directory structure which is described in this
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section.
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Orthogonal to this directory structure, you can choose _where_ you place
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this structure itself: either inside the Buildroot tree, or outside of
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it using a br2-external tree. Both options are valid, the choice is up
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to you.
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-----
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+-- board/
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| +-- <company>/
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| +-- <boardname>/
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| +-- linux.config
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| +-- busybox.config
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| +-- <other configuration files>
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| +-- post_build.sh
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| +-- post_image.sh
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| +-- rootfs_overlay/
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| | +-- etc/
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| | +-- <some file>
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| +-- patches/
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| +-- foo/
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| | +-- <some patch>
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| +-- libbar/
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| +-- <some other patches>
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+-- configs/
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| +-- <boardname>_defconfig
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+-- package/
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| +-- <company>/
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| +-- Config.in (if not using a br2-external tree)
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| +-- <company>.mk (if not using a br2-external tree)
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| +-- package1/
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| | +-- Config.in
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| | +-- package1.mk
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| +-- package2/
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| +-- Config.in
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| +-- package2.mk
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+-- Config.in (if using a br2-external tree)
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+-- external.mk (if using a br2-external tree)
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+-- external.desc (if using a br2-external tree)
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------
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Details on the files shown above are given further in this chapter.
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Note: if you choose to place this structure outside of the Buildroot
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tree but in a br2-external tree, the <company> and possibly <boardname>
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components may be superfluous and can be left out.
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==== Implementing layered customizations
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It is quite common for a user to have several related projects that partly
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need the same customizations. Instead of duplicating these
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customizations for each project, it is recommended to use a layered
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customization approach, as explained in this section.
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Almost all of the customization methods available in Buildroot, like
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post-build scripts and root filesystem overlays, accept a
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space-separated list of items. The specified items are always treated in
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order, from left to right. By creating more than one such item, one for
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the common customizations and another one for the really
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project-specific customizations, you can avoid unnecessary duplication.
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Each layer is typically embodied by a separate directory inside
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+board/<company>/+. Depending on your projects, you could even introduce
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more than two layers.
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An example directory structure for where a user has two customization
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layers 'common' and 'fooboard' is:
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-----
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+-- board/
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+-- <company>/
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+-- common/
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| +-- post_build.sh
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| +-- rootfs_overlay/
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| | +-- ...
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| +-- patches/
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| +-- ...
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+-- fooboard/
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+-- linux.config
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+-- busybox.config
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+-- <other configuration files>
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+-- post_build.sh
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+-- rootfs_overlay/
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| +-- ...
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+-- patches/
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+-- ...
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-----
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For example, if the user has the +BR2_GLOBAL_PATCH_DIR+ configuration
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option set as:
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-----
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BR2_GLOBAL_PATCH_DIR="board/<company>/common/patches board/<company>/fooboard/patches"
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-----
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then first the patches from the 'common' layer would be applied,
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followed by the patches from the 'fooboard' layer.
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