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| author | Patrick Georgi <pgeorgi@google.com> | 2021-03-16 21:45:25 +0100 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2021-03-17 23:07:07 +0000 |
| commit | a763e8f92b9faeb70f63304f974551479ac3859b (patch) | |
| tree | 116b9cff55c750f53e76e7a7f5c89b2885defc30 /Documentation/tutorial | |
| parent | a9b44f4c79078210fe9966daf2412cc222c2d0a9 (diff) | |
| download | coreboot-a763e8f92b9faeb70f63304f974551479ac3859b.tar.gz coreboot-a763e8f92b9faeb70f63304f974551479ac3859b.tar.bz2 coreboot-a763e8f92b9faeb70f63304f974551479ac3859b.zip | |
Documentation: Describe the site-local hook in our config/build system
Change-Id: Ia682b784540fa82e1f216f76d87d59a4f0b94486
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51546
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'Documentation/tutorial')
| -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 b8fb82737d8b..8b3d88aaba45 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 000000000000..6ca5971164ad --- /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. |