[U-Boot] How to start U-Boot for i.MX31 NAND out of RedBoot (out of RAM)

Hello,

I have a board with a i.MX31, NAND-Flash and RAM. On the Board a RedBoot is preinstalled and runs properly. I want to replace the RedBoot with my U-Boot port.

How can I test U-Boot out of RedBoot when I load the u-boot image in the RAM? What do I have to configure in my u-boot if i want to test it from ram before burning it into the nand flash?

Thanks a lot for your help. Ulrich Gerster