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Kernel 3.19 (re-)introduced Device Tree Overlays. I am on Linux kernel 3.19.4, via Fedora (3.19.4-200.fc21.armv7hl).
I have an overlay file overlay.dts as described in the documentation.
overlay.c contains functions to work with overlays, including to functions to load an overlay.
Does the kernel check any paths for overlays to load? If so, where? If not, how can I load my overlay?
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A device tree (DT) is a data structure of named nodes and properties that describe non-discoverable hardware. Operating systems, such as the Linux kernel used in Android, use DTs to support a wide range of hardware configurations used by Android-powered devices.
The Device Tree Blob (or binary) is a file containing information about the board and its hardware.
From my experience (3.8-3.14), DTB loading is actually the jurisdiction of the boot-loader, rather than the kernel itself. I've used u-boot for this - u-boot can load the compiled device-tree file (man dtc) from an EXT2-based filesystem to a known location in RAM, which is then specified in the kernel command line.
Which boot-loader are you using?
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