On Thu, Nov 07, 2024 at 10:35:58PM +1100, Michael Ellerman wrote: > "Rob Herring (Arm)" <robh@xxxxxxxxxx> writes: > > While OpenFirmware originally allowed walking parent nodes and default > > root values for #address-cells and #size-cells, FDT has long required > > explicit values. It's been a warning in dtc for the root node since the > > beginning (2005) and for any parent node since 2007. Of course, not all > > FDT uses dtc, but that should be the majority by far. The various > > extracted OF devicetrees I have dating back to the 1990s (various > > PowerMac, OLPC, PASemi Nemo) all have explicit root node properties. > > I have various old device trees that have been given to me over the > years, and as far as I can tell they all have these properties (some of > them are partial trees so it's hard to be 100% sure). Many SUN systems won't have such superfluous properties. But does anyone use such systems at all anymore, and do people use dtc with those :-) Segher
