On 24/09/2020 12.54, Wolfgang Denk wrote:
Dear Rasmus,
In message 125344f4-2b69-1c7a-0f5a-6d27ab312487@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