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README: document the requirements for CONFIG_SYS_HZ 

CONFIG_SYS_HZ must be 1000, and get_timer() must therefore return ms.
Document this.

README text provided by Tom Rini.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
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Stephen Warren 2013-03-27 17:06:41 +00:00 committed by Tom Rini
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@ -496,6 +496,13 @@ The following options need to be configured:
exists, unlike the similar options in the Linux kernel. Do not
set these options unless they apply!
- CPU timer options:
CONFIG_SYS_HZ
The frequency of the timer returned by get_timer().
get_timer() must operate in milliseconds and this CONFIG
option must be set to 1000.
- Linux Kernel Interface:
CONFIG_CLOCKS_IN_MHZ