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-The directories here are managed with 'git subtree'.  The syntax for this is
-non-intuitive, so it is documented below.
-
-The yocto-poky tree should always be based on a real tag, like 'yocto-2.2'.
-The other trees should be the latest commit of the branch named after the
-corresponding yocto tree.  Ex. yocto-2.2 == "morty", so "origin/morty".
-
-We always require developers to submit changes in these trees upstream first
-and only once they have been merged upstream do we backport them.  When
-updating a tree, it is possible that some of the backported commits are not
-yet in the sub-tree.  For instance, if we are on yocto-2.1 and upgrading to
-yocto-2.2, a developer might have backported a commit from what-will-become
-yocto-2.3 and we need to preserve this commit.  Thus, you'll need to take
-an inventory of these commits to re-cherry-pick at the end of the sub-tree
-update process.
-
-```
-# Use git-log to keep track of the current commit.
-git log -n1 --oneline
-
-# Run 'subtree split --rejoin' so git will re-calculate how the current
-# subtree differs from the original external repository.
-git subtree split --prefix=import-layers/meta-openembedded --rejoin
-
-# Run 'subtree pull' to update the subtree.
-git subtree pull --prefix=import-layers/meta-openembedded --squash \
-        ../imports/meta-openembedded origin/morty
-
-# Use git-log to find the 'squash' commit created by 'subtree pull'.
-# Keep record of the 2nd commit titled "Squashed ...".
-git log -n2 --oneline
-
-# Return to your original tree state.
-git checkout <original>
-
-# Cherry-pick the 'subtree pull' 'squash' commit.
-git cherry-pick --strategy=subtree <saved>
-
-# re-apply (cherry-pick) unmerged backports and rebase --interactive to
-# 'fixup' them into the subtree  cherry-pick.
-git cherry-pick <reapply>
-...
-git rebase --interactive <original>
-```