hwclock is not working correctly on compaq 6510b, compaq presario c700

Hi,
I am not able to set clock on compaq 6510b and compaq presario c700 model laptops.

$ sudo hwclock
select() to /dev/rtc to wait for clock tick timed out The same error shows while booting up.

Fedora core 8 with 2.6.23 kernel was able to setup this correctly on 6510b.

Regards
Praveen

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