[U-Boot] [RFC] command/cache: Add flush_cache command

[Wolfgang Denk]

Dear Scott Wood,

In message <1363889275.31522.12 at snotra> you wrote:
>
> > There is no need to change any syntax.
> 
> Then how would we know what range to flush?

Use a IH_TYPE_STANDALONE U-Boot image, and bootm?

Best regards,

Wolfgang Denk

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