Device-tree overlay feature allows for runtime modification
summary
Covers the device-tree overlay mechanism for modifying a flattened device tree at runtime, explaining how overlay blobs are merged into a base blob after resolving local and external phandle references. Describes extending the feature so one overlay blob can be applied on top of another—allowing unresolved external references to be resolved by later overlays—to support separate device-tree sources in multiple repositories and merge their binaries during build.
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