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 <swar...@wwwdotorg.org>
---
v2: Reworded the README text.
---
 README |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/README b/README
index 7f2506a..efb8cc6 100644
--- a/README
+++ b/README
@@ -495,6 +495,13 @@ 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
 
-- 
1.7.10.4

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