Hello,
If you wish to leave the rest of LoLo's setup intact, you should be able to disable interrupts when you jump to your application and then over write LoLo's interrupt handler with your own.

After you load your application, you can turn the cache off to make sure that when you copy the interrupts over the top of LoLo's, the instruction cache does not use the stored instructions.

I would reccomend that you disable all interrupt sources in the VIC, and then start from scratch when you enable your handlers so that you do not inadvertantly leave any interrupts enabled that you did not intend to. From the info cpu command you can see that the interrupt vectors are at the base of sdram.

If you want to keep LoLo's memory map and avoid writing any mmu code, you must use the jump command and not the exec command, or LoLo will turn off the mmu. See the LogicLoader manual for more information on load, info, jump, and exec.

Sharp must have mmu and cache enable/disable code in their BlueStreak library, which can be downloaded from http://www.sharpsma.com. You can find all you need to know about the arm 9 core in this document from arm http://www.arm.com/pdfs/DDI0184B_922T_TRM.pdf. Re-enabling the cache is very simple and is covered in the arm manual.

Good Luck,
Bruce