Hi,
Replying to one part of the mail only, since I agree with everything else.
On Thu, Mar 29, 2018 at 10:19:22AM +0100, Andre Przywara wrote:
What I'm trying to say is we should anyway sync to Linux bindings and dts files, but that could be like step-by-step based on the relevant driver support with proper testing this way we can monitor the "Size" instead of adding unneeded(for now) and untested once now struggling to think about size constraints later.
I hope we will never have to deal with hard size constraint for U-Boot proper anymore. I would like to judge any increase in size by its benefit. And booting random UEFI enabled OSes out of the box is a very good rationale for adding 10KB to the image size.
Keep in mind: Eventually you have to load this DT anyway, so effectively you will save on the image size, because you avoid duplication. Actually the OS does not need to carry all supported DTs, because the only one needed is provided by U-Boot.
I really don't have to deal with it ever again as well, and I really think we'll need to pay more attention to whatever we'll be merging that would enable any option.
Given the current craze that everyone thinks their new Kconfig option is so awesome that everyone must want it, that's probably going to be a bit hard to achieve, but if we have a patch coming our way that enables something that is already covered by an option we have, we must say no.
A pretty good example would be for example in our current case why do we have DFU and fastboot enabled, while both cover pretty much the same usecase. Or why do we have USB gadget mass storage support on by default, while most of the users probably will never use it.
Of course, those options are in, so we can't really remove them now, especially without any strong incentive. But we can prevent any uneeded option from creeping in in the future.
Maxime