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Real Time Clock & Real Time Timer

Hi

I hope this is the right forum for me to post in.

I'm confused. What's the difference between RTC (Real Time Clock) and RTT (Real Time Timer).

And how can I enable access to the hardware clock (#hwclock returns the message that the hardware clock is not accessible) via a RTT ?.

Any suggestions to as how I can use an existing RTC driver to write up a RTT driver for that purpose ? (I'm using the AT91SAM9261)..The RTT in question is hardwired to a crystal oscillator. The AT91SAM9261 doesn't have a RTC, only a RTT.

I'm a kernel newbie and hope I can learn a lot and give back to the community.

Appreciate your guidance.
Jiramak

And, this is a RTC driver for the AT91SAM9200, how do we make this into a RTC driver ?

http://dev.laptop.org/git.do?p=users...5e4c3fad804ef8