On 20-01-21, 23:14, Frank Rowand wrote: > It is a convenient FDT to use because it provides the frame that the overlays > require to be applied. It is fortunate that fdtoverlay does not reject the use > of an FDT with overlay metadata as the base blob. > This is probably a good idea instead of depending on the leniency of fdtoverlay. I believe fdtoverlay allows that intentionally, that would be required for the cases where we have a hierarchy of extension boards or overlays. A platform can have a base dtb (with /plugin/;), then we can have an overlay (1) for an extension board (with /plugin/;) and then an overlay (2) for an extension board for the previous extension board. In such a case overlay-(2) can't be applied directly to the base dtb as it may not find all the nodes it is trying to update. And so overlay-(2) needs to be applied to overlay-(1) and then the output of this can be applied to the base dtb. This is very similar to what I tried with the intermediate.dtb earlier. -- viresh
