* 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
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