How to use MMU?

Hi, I'm using AT91SAM9260 in a printer design. I'm using RL-RTX operating system.Since AT91SAM9 contains I & D caches and MMU built-in I'd like to use it.But, all the examples provided by Keil for AT91SAM9 had enabled only I-cache. How can I use both the I and D caches and MMU? Can I use MMU with RL-RTX?

Please help me.