* RTC drift in PPC
@ 2007-05-10 11:16 pjmaiya
2007-05-10 14:45 ` John Reiser
0 siblings, 1 reply; 3+ messages in thread
From: pjmaiya @ 2007-05-10 11:16 UTC (permalink / raw)
To: linuxppc-embedded
[-- Attachment #1: Type: text/plain, Size: 299 bytes --]
hi,
We are running RTC on mpc860 board with external crystal. During boot we get date and time from h/w RTC chip and then it runs pn software tick, which is handled by kernel. We are getting 4 minutes drift for 21 hours. Can any one suggest, how to reduce the drift.
thnax in advance,
pjmaiya
[-- Attachment #2: Type: text/html, Size: 809 bytes --]
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: RTC drift in PPC
2007-05-10 11:16 RTC drift in PPC pjmaiya
@ 2007-05-10 14:45 ` John Reiser
2007-06-05 7:26 ` Theo Gjaltema
0 siblings, 1 reply; 3+ messages in thread
From: John Reiser @ 2007-05-10 14:45 UTC (permalink / raw)
To: pjmaiya; +Cc: linuxppc-embedded
> We are running RTC on mpc860 board with external crystal...
> We are getting 4 minutes drift for 21 hours.
A slowdown in the approx. range 1:300 to 1:350 is endemic to linux ppc:
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=157581
--
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: RTC drift in PPC
2007-05-10 14:45 ` John Reiser
@ 2007-06-05 7:26 ` Theo Gjaltema
0 siblings, 0 replies; 3+ messages in thread
From: Theo Gjaltema @ 2007-06-05 7:26 UTC (permalink / raw)
To: linuxppc-embedded
I 'v measured the clock on a mpc8280 board running the 2.4.25 kernel
obtained from ELDK3.1.1, no problem with the clock during a test period
of a few days.
Theo.
>> We are running RTC on mpc860 board with external crystal...
>> We are getting 4 minutes drift for 21 hours.
>>
>
> A slowdown in the approx. range 1:300 to 1:350 is endemic to linux ppc:
> http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=157581
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2007-06-05 7:44 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2007-05-10 11:16 RTC drift in PPC pjmaiya
2007-05-10 14:45 ` John Reiser
2007-06-05 7:26 ` Theo Gjaltema
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).