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+.. _stable-rules:
+
+=======================================
+op-build stable tree rules and releases
+=======================================
+
+Our stable tree process follows processes similar to other open source projects
+such as the Linux Kernel and Buildroot, as do several OpenPOWER Firmware
+components such as Skiboot and Petitboot.
+
+The purpose of a -stable tree is to give vendors a stable base to create
+firmware releases from and to incorporate into service packs. New stable
+releases contain critical fixes only.
+
+As a general rule, only the most recent op-build release gets a maintained
+-stable tree. If you wish to maintain an older tree, speak up! For example,
+with my IBMer hat on, we'll maintain branches that we ship in products.
+
+What patches are accepted?
+--------------------------
+
+* Patches must be obviously correct and tested
+
+  * A Tested-by signoff is *important*
+* A patch must fix a real bug
+* No trivial patches, such fixups belong in main branch
+* Not fix a purely theoretical problem unless you can prove how
+  it's exploitable
+* The patch, or an equivalent one, must already be in master
+
+  * Submitting to both at the same time is okay, but back-porting is better
+
+HOWTO submit to stable
+----------------------
+
+1. Make a pull request with "[stable op-build-N.N.y]" in subject (where N.N.y
+   is the stable branch to which you are targeting)
+
+   * This targets the patch *ONLY* to the stable branch.
+
+     * Such commits will *NOT* be merged into master.
+   * Use this when:
+
+     a. cherry-picking a fix from master
+     b. fixing something that is only broken in stable
+     c. fix in stable needs to be completely different than in master
+
+     If b or c: explain why.
+   * If cherry-picking, include the following at the top of your
+     commit message (or use the -x option to git-cherry-pick): ::
+
+       commit <sha1> upstream.
+   * If the patch has been modified, explain why in description.
+
+2. Add a comment on the PR indicating that a PR should also go to a stable
+   branch when making a Pull request to master
+
+   * This targets the patch to master and stable.
+   * You can target a patch to a specific stable tree by putting that in the
+     comment
+   * You can ask for prerequisites to be cherry-picked.
+
+Trees
+-----
+
+* https://github.com/open-power/op-build/ (or via ssh at ``git@github.com:open-power/op-build.git`` )
+
+  * (branches are op-build-X.Y.y - e.g. op-build-2.0.y)
+
+* Some stable versions may last longer than others
+
+  * So there may be op-build-2.0.y and op-build-2.4.y actively maintained
+    and op-build-2.0.y could possibly outlast op-build-2.4.y.