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.. _versioning:
Version Scheme
==============
Each firmware component has its own versioning scheme, and `op-build` brings
all of these components together in one image with one global version
number.
Firmware versions are exposed to the user through both the device tree
(:ref:`skiboot:device-tree/ibm,firmware-versions`) and the VERSION firmware
partition. As such, firmware versioning numbers **MUST** follow the
requirements in order for some functionality to be correct.
skiboot
:ref:`skiboot:versioning`
Hostboot
Currently just uses the git SHA1 of the commit
OCC
Currently just uses the git SHA1 of the commit
Petitboot
Uses a X.Y.Z versioning scheme.
Linux
We use the upstream Linux kernel version, and always append ``-openpowerN``
where N is a number starting at 1 that increases for each change we make
to any additional patches carried in `op-build` for that specific kernel
version.
We follow the stable tree and have an "upstream *first*" policy in place.
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