[U-Boot] a few questions about saving bootcount in the environment

[Robert P. J. Day]

On Mon, 25 Jul 2016, Wolfgang Denk wrote:

> Dear Robert,
>
> In message <alpine.LFD.2.20.1607251355090.3253 at 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

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

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