RTC drift in PPC

[pjmaiya]

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
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