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Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/tutorial/index.md | 1 | ||||
| -rw-r--r-- | Documentation/tutorial/managing_local_additions.md | 43 |
2 files changed, 44 insertions, 0 deletions
diff --git a/Documentation/tutorial/index.md b/Documentation/tutorial/index.md index b8fb82737d..8b3d88aaba 100644 --- a/Documentation/tutorial/index.md +++ b/Documentation/tutorial/index.md @@ -3,3 +3,4 @@ * [Part 1: Starting from scratch](part1.md) * [Part 2: Submitting a patch to coreboot.org](part2.md) * [Part 3: Writing unit tests](part3.md) +* [Managing local additions](managing_local_additions.md) diff --git a/Documentation/tutorial/managing_local_additions.md b/Documentation/tutorial/managing_local_additions.md new file mode 100644 index 0000000000..6ca5971164 --- /dev/null +++ b/Documentation/tutorial/managing_local_additions.md @@ -0,0 +1,43 @@ +Managing local additions +======================== + +This section describes the site-local mechanism, what it is good for and +how it can be used. + +What is site-local? +------------------- +site-local is the name of a directory that won't ever appear in the +upstream coreboot repository but is referred to in several key places of its +configuration and build system. The intent is provide a single location to +store local modifications. + +By keeping local additions to builds in this place, it can be versioned +independently from upstream (e.g. controlled by git in another repository) +and any changes made there won't ever conflict with upstream changes. + +This optional directory is searched for in the top-level of the coreboot +repo and is called `site-local`. + +Integration into the configuration system +----------------------------------------- +Kconfig includes `site-local/Kconfig` relatively early, so it can be used +to pre-define some configuration before coreboot's regular ruleset sets +up defaults. + +Integration into the build system +--------------------------------- +The build system includes, if present, `site-local/Makefile.inc`. The main +purpose so far has been to add additional files to a CBFS image. A single +Makefile.inc can serve multiple boards, for example: + + cbfs-files-$(CONFIG_BOARD_INTEL_D945GCLF) += pci8086,2772.rom + pci8086,2772.rom-file := intel_d945gclf/pci8086,2772.rom + pci8086,2772.rom-type := optionrom + + cbfs-files-$(CONFIG_BOARD_KONTRON_986LCD_M) += pci8086,27a2.rom + pci8086,27a2.rom-file := kontron_986lcd-m/pci8086,27a2.rom + pci8086,27a2.rom-type := optionrom + +This adds the correct Option ROM binary (which are non-redistributable and +therefore can't become part of the coreboot.org repos) to coreboot.rom when +built for intel/d945gclf or kontron/986lcd-m. |