[U-Boot] Booting from Nand based on i.MX51

Hi,

I am using mx51 base board, I want to make u-boot booting from nand flash. Does anyone knows how to modify the u-boot source?

Does add some code to init the nand flash controller in flash_header.S's dcd section?

Does anyone have u-boot booting from NAND on mx51? Any repository, or a patch that might be available?

Best Regards, Shulin