Hi Pantelis,
On Fr, 2015-02-27 at 20:55 +0200, Pantelis Antoniou wrote:
> +3.b) The Device Tree fragments must be compiled with the same option but they
> +must also have a tag (/plugin/) that allows undefined references to labels
> +that are not present at compilation time to be recorded so that the runtime
> +loader can fix them.
> +
> +So the bar peripheral's DTS format would be of the form:
> +
> +/plugin/; /* allow undefined label references and record them */
> +/ {
> + .... /* various properties for loader use; i.e. part id etc. */
> + fragment@0 {
> + target = <&ocp>;
> + __overlay__ {
> + /* bar peripheral */
> + bar {
> + compatible = "corp,bar";
> + ... /* various properties and child nodes */
> + }
> + };
> + };
> +};
> +
> +Note that there's a target property that specifies the location where the
> +contents of the overlay node will be placed, and it references the label
> +in the foo.dts file.
The kernel overlay code also supports using 'target-path="/path";'
instead of 'target=<phandle>;' to work with base DTBs which have no
__symbols__ node. Shouldn't this be mentioned here as well?
Thanks,
Jan
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