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

[Wolfgang Denk]

Dear Tom,

I wrote:

> Agreed.  Let me rephrase the warning, then: it is always a good idea
> to minimize the number of writes to the environment, especially when
> done automagically.  One should at least avoid to re-write it on every
> boot, especially when storage is some (flash based) storage device
> with a limited number of erase/write cycles.  And even on other stoage
> each write access includes the risk of errors.

And of course access to the environment in inherently much slower than
a register write. This may not matter in many cases, but when
optimizing boot time it may be important, too.

Best regards,

Wolfgang Denk

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