On Mon, 25 Jul 2016, Wolfgang Denk wrote:
Dear Robert,
In message alpine.LFD.2.20.1607251355090.3253@localhost.localdomain you wrote:
i'm sure i'm asking the obvious, but if every boot to user space is successful, bootcount will have a value of zero each time, yes? so if user space code checks it and it's zero, then, you're done, no need to write.
As Heiko already explained, the update of the boot counter (= read from env, increment, rewrite environment to persistent storage) is done in U-Boot, and without "upgrade_available" it would happen on each and every boot of the system.
The boot counter is implemented in U-Boot - only the resetting is done in user space (and requires another write).
whoops, i missed that bit, just trying to catch up now.
rday