RCM3900/RCM3910 memory map

We are designing a board based on the RCM3910 module and have a  question regarding memory configuration. Any help with this would be greatly appreciated.

As we understand the RCM3900/RCM3910 can be run at high speed (44MHz) with program code copied from flash to a fast SRAM chip at boot time or without the clock doubler and execute code directly out of flash. When operating in high speed mode it looks like the bios sets up memory quadrants with only 256k of the normal RAM (which is 512k in total) accessible. It looks like it would require us to alter the bios ourselves if we wanted to make ALL the 'normal' RAM available whilst executing at 44MHz ie. No flash mapped in- 2 quadrants mapped to program code in 'fast' SRAM and the other 2 mapped to normal RAM.

Can anyone confirm this? Has anyone had any experience in making this modification or customising the rabbit bios libs in general?

Cheers,

Ian

Ian Lovatt
Embedded Software Engineer
t-mac Technologies


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