[U-Boot] U-boot with BDI

Hi all, I wish to configure my BDI3000 to boot from NAND flash on the mx31 platform. I do not want the BDI to do the low level init including processor/clock/SDRAM setup etc. Instead, i want my U-boot do it when "reset halt/run" is executed. What do i need to put in the BDI config in order to do that. Motivation is being able to debug NAND boot. Thanks all in advance, Stephanie.