| Device Tree Dynamic Resolver Notes |
| ---------------------------------- |
| |
| This document describes the implementation of the in-kernel |
| Device Tree resolver, residing in drivers/of/resolver.c |
| |
| How the resolver works |
| ---------------------- |
| |
| The resolver is given as an input an arbitrary tree compiled with the |
| proper dtc option and having a /plugin/ tag. This generates the |
| appropriate __fixups__ & __local_fixups__ nodes. |
| |
| In sequence the resolver works by the following steps: |
| |
| 1. Get the maximum device tree phandle value from the live tree + 1. |
| 2. Adjust all the local phandles of the tree to resolve by that amount. |
| 3. Using the __local__fixups__ node information adjust all local references |
| by the same amount. |
| 4. For each property in the __fixups__ node locate the node it references |
| in the live tree. This is the label used to tag the node. |
| 5. Retrieve the phandle of the target of the fixup. |
| 6. For each fixup in the property locate the node:property:offset location |
| and replace it with the phandle value. |