[U-Boot] [v3] command/cache: Add flush command

[Wolfgang Denk <wd@denx.de>]

Dear sun york-R58495,

In message <C707E9F4D8007146BF8DC1424B113AC70B3A6A83@039-SN2MPN1-012.039d.mgd.msft.net> you wrote:
> 
> I think it is best to keep this patch as it and stick with the
> original flush_cache name. It uses the existing function
> flush_cache() which is available for most (if not all) architectures.
> Splitting the dcache and icache not only adds more code, but
> architecture-dependent code.

As mentioned before: reusing existing code is fine, but we already
have commands for cache handling, and adding arbitrary new ones to
implement combinations of functions makes does not scale.  Assume
tomorrow someone needs to add more ganular handling for example
regarding L2 caches, etc.  Would you suggest to add another set of new
commands, then?  This makes no sense.

Please implement IC related operations as subcommands to the "icache"
command, and DC releated ones as subcommands to "dcache".

[In the example of L2 cache above, it would be for example sufficient
to add a "-L2" option to the "icache" / "dcache" commands.]

Best regards,

Wolfgang Denk

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