Re: [iPAQ] real-time clock accuracy

On Mon, 11 Jun 2001, Alan Cox wrote:

> > According to the SA1110 manual, there is a "trim" register that allows you
> > to adjust, or compensate, for unprecise cristal clocking the RTC. However
> > the correction is said to be at most +/-5 seconds per month.
>
> Linux supports adjtimex() so it can compensate smoothly for a fair bit more

Correction on what I said: the correction can be up to +/- 5 seconds per
month. The problem with adjtimex() occurs when you want to put your iPAQ to
sleep.

Now it might be a good idea to use an existing interface from user space
tools for such adjustment if there is one already.

Nicolas
Received on Mon Jun 11 11:10:39 2001