Using realtime clock?

Wolfgang Denk wd at
Thu Jan 11 03:22:58 EST 2001

In message < at> you wrote:
> The astronomy people, among others, are really fanatical about accurate
> time and have some very elaborate programs to synchronize clocks to the
> nanosecond (microsecond?) level.  These involve NTP daemons.  Note that
> the NTP daemons can synchronize to a radio clock that provides a
> 1/second tick: your simplest solution would probably be to set up your
> accurate RTC to do a 1/second interrupt and then tie it into a NTP
> daemon to keep your kernel clock accurate.

Seems a bit of overhead (especially for embedded systems with limited
resources) to add a NTP daemon just to make one part  of  the  kernel
timekeeping toal to the other...

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at
"It's when they say 2 + 2 = 5 that I begin to argue."    - Eric Pepke

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