[PATCH 6/6] fdtdec: apply DT overlays from bloblist

[Michal Simek]

Hi Raymond,

>>>> Isn't it also worth to check if existing CONTROL_FDT has enough space inside
>>>> that new overlay can fit there before resizing it?
>>> By default each entry only contains the actual size since bloblist
>>> (aka transfer list) is designed as a compact data structure and there
>>> should not be a waiver for CONTROL_FDT to carry additional spare
>>> spaces.
>>
>> Right but you can build dtb via dtc -S/-p to add additional padding. It means
>> dtb will be bigger which goes to TL and should be possible to fit overlay there.
>>
> Yes, a developer knows exactly how big the merged DT should be...but
> it is only DT specific and not a common case for applying other blob
> data.
> Maybe I can add a DT Kconfig for skipping resizing for the use case
> you mentioned if all reviewers agree.

What I am saying is free space calculation should start with looking at free 
space in base DTB. If it is enough (with pad) do nothing. If there is not enough 
space then call your code.

Thanks,
Michal