UIP flag not cleared

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Hi list, 


I am having troubles porting my os to qemu/kvm environment. It's about the RTC (real-time clock) 

There is a flag (UIP flag) which is supposed to show when RTC can be read or not. 

We wait 10ms for that flag to be cleared, but sometimes it's not enough with qemu/kvm. 

Is it necessary to check this flag at all ? or can I always read the RTC regardless of the status of the flag ? If the latter is true, why then is this flag not always clear ? 

I'm using the virtualization stack of centos 6.2 

Thanks in advance 
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