RE: [Xen-devel] more bizarre rtc behaviour...

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> > I have now noticed that with the rtc module loaded it
> > exhibits the behaviour I described, but if I unload the rtc
> > module, it all works fine. The underlying hardware clock
> > appears to be fine.
> 
> The rtc module isn't particularly useful in a xen environment. Any
idea
> what in user space is using /dec/rtc ?
> 

Nothing is loading it automatically, I just tried loading it as dom0 is
SMP, and the linux config recommends using rtc.ko in an SMP environment.
I thought maybe that could be explaining my rtc kernel errors.

It just occurred to me that the counting sequence appeared to be a
mismatched BCD HEX problem.... something about rtc is forcing an
interpretation of a HEX value as BCD (or maybe my bios is storing
something as HEX that should be BCD?), eg:

HEX | DEC | BCD
 00 |  00 |  00
 01 |  01 |  01
...............
 08 |  08 |  08 
 09 |  09 |  09
 0a |  10 |  00
 0b |  11 |  11
 0c |  12 |  12
 0d |  13 |  13
 0e |  14 |  14
 0f |  15 |  15
 10 |  16 |  10
 11 |  17 |  11
...............
 3a |  58 |  40
 3b |  59 |  41
 00 |  00 |  00

Could Xen be responsible for that in any way?

Thanks

James

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