[U-Boot] How to reduce size of U-Boot image (i.MX31, NAND-Flash)

Hello,

I'm trying to optimize the u-boot image I get after compiling. It's size is 13XkB depending on the features I define. I'm using a i.MX31 processor and only NAND-Flash. I think it should be possible to get a smaller Image.

Are there some common tricks, or do you have some suggestions how to reduce the size of u-boot?

Thanks in advance. Best Regards Ulrich Gerster