[U-Boot] [PATCH] README: document the requirements for CONFIG_SYS_HZ

[Wolfgang Denk]

Dear Stephen Warren,

In message <514CCAAE.6020909 at wwwdotorg.org> you wrote:
>
> >> +		The frequency of the timer returned by get_timer(). This value
> >> +		MUST be 1000.
> > 
> > This is misleading, or even incorrect.  If I read this, I would expect
> > that get_timer() returns 1000. Obviously, this is incorrect.  Instead,
> > get_timer() returns timestamp information in millisecond resolution.
> 
> That is not what that sentence means.

Yes, I know.  But it can be easily misinterpreted.

Best regards,

Wolfgang Denk

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