To summarize:
The easy way is to use 2G.
The preferred way would be to mimic mrc behaviour and reboot after
finding the correct size.
I'm not sure it's "easy vs. preferred" so much as
- simple that has no known failure cases (yet).
- best that requires that we have another variable we have to store in flash
At least to me, it's not as cut and dried as easy vs. preferred. The preferred way adds a lot of moving runtime parts, and we'll need to cover for the case that the stored variable gets damaged somehow. The easy way is a runtime constant, which I kind of like.
If the "easy" way always works, i.e. we never find a case where it causes a problem, then it seems superior to me.
ron