[PATCH 2/2] env: add CONFIG_ENV_SECT_SIZE_AUTO

[Rasmus Villemoes]

On 24/09/2020 12.54, Wolfgang Denk wrote:
> Dear Rasmus,
> 
> In message <125344f4-2b69-1c7a-0f5a-6d27ab312487 at prevas.dk> you wrote:
>>>
>>> On our newer boards with the 4K erase size, saving the environment now
>>> takes 0.080 seconds instead of 0.53 seconds, which directly translates
>>> to that much faster boot time since our logic always causes the
>>> environment to be written during boot.
> 
> Is this your way of implementing scheduled obsolescence? 

I'll ignore that.

> Automatically writing the environment on every boot is always a
> really bad idea. Never ever do that.

Well, there's really no other place on this piece of hardware to
implement a boot counter/slot selection. Sure, we could use another part
of the spi flash and define our own storage format etc., but then we
might as well use the u-boot environment, which allows us to use
existing tools/APIs both on the U-Boot and linux side.

And yes, the number of erase cycles compared to how often this device is
booted was taken into account when this was decided.

Rasmus