On 21-01-21, 17:34, David Gibson wrote:

No, this is the wrong way around.  The expected operation here is that
you apply overlay (1) to the base tree, giving you, say, output1.dtb.
output1.dtb is (effectively) a base tree itself, to which you can then
apply overlay-(2).

Thanks for the confirmation about this.

Merging overlays is
something that could make sense, but fdtoverlay will not do it at
present.

FWIW, I think it works fine right now even if it not intentional. I
did inspect the output dtb (made by merging two overlays) using
fdtdump and it looked okay. But yeah, I understand that we shouldn't
do it.

-- 
viresh