438b463a8f
* Add more subdirectories and index.mds. * Move "getting started" and "lessons" into sub-directories. * Move "NativeRaminit" into northbridge/intel/sandybridge folder. * Move "MultiProcessorInit" into soc/intel/icelake folder. * Reference new files Change-Id: I78c3ec0e8bcc342686277ae141a88d0486680978 Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org> Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/26262 Reviewed-by: Patrick Georgi <pgeorgi@google.com> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
Use of git submodules in coreboot
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=================================
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coreboot uses git submodules to keep certain parts of the tree separate,
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with two major use cases:
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First, we use a vendor tool by NVIDIA for systems based on their SoC
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and since they publish it through git, we can just import it into our
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tree using submodules.
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Second, lots of boards these days require binaries and we want to keep
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them separate from coreboot proper to clearly delineate shiny Open Source
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from ugly blobs.
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Since we don't want to impose blobs on users who really don't need them,
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that repository is only downloaded and checked out on explicit request.
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Handling submodules
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-------------------
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For the most part, submodules should be automatically checked out on the
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first execution of the coreboot Makefile.
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To manually fetch all repositories (eg. when you want to prepare the tree
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for archiving, or to use it without network access), run
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$ git submodule update --init --checkout
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This also checks out the binaries below `3rdparty/`
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Mirroring coreboot
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------------------
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When running a coreboot mirror to checkout from, for full operation, you
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should also mirror the blobs and nvidia-cbootimage repository, and place
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them in the same directory as the coreboot repository mirror.
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That is, when residing in coreboot's repository, `cd ../blobs.git`
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should move you to the blobs repository.
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With that, no matter what the URL of your coreboot repository is, the
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git client (of a sufficiently new version) is able to pick up the other
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repositories transparently.
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Minimum requirements
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--------------------
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git needs to be able to handle relative paths to submodule repositories,
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and it needs to know about non-automatic submodules.
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For these features, we require git version 1.7.6.1 or newer.
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