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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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@ -496,6 +496,13 @@ The following options need to be configured:
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exists, unlike the similar options in the Linux kernel. Do not
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set these options unless they apply!
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- CPU timer options:
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CONFIG_SYS_HZ
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The frequency of the timer returned by get_timer().
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get_timer() must operate in milliseconds and this CONFIG
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option must be set to 1000.
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- Linux Kernel Interface:
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CONFIG_CLOCKS_IN_MHZ
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