sunxi: Fix boot of Cubietruk and al.

Quoted 37 lines

Hi,

Quoted 34 lines · Maxime Ripard

Quoted 24 lines · Andre Przywara

Hi,

Quoted 11 lines · Maxime Ripard

Hi,

Most featureful boards, such as the Cubietruck, have been broken since
the release 2017.09.

This is due to a size increase of the binary that will trip us across
the size we've been using in the u-boot-sunxi-with-spl.bin file.

Quoted 9 lines

We would have two ways to work around it. The first one would be to
just increase the offset of the environment. However, since it would
break all the environments of our users and possibly the custom
partition scheme that they would have created, it doesn't really seem
like a smart move.

Quoted 4 lines

Is that really such a problem? How many people rely on having their
custom environment preserved over an update? (That's an honest question)

All of them, I guess. In your U-boot upgrade script, do you do a 'env
default -a; saveenv' all the time ?

Quoted 8 lines

Quoted 1 line

I know I don't.

Well, I never use the saved environment and always expected some user or
board specific environment to come from some file (boot.scr or something
loaded via TFTP). But that's just my personal use, hence I was asking.

Well, even if you want to boot to tftp, you'll need to have some setup
to do, even just to use a different server IP, and that will be in the
environment.