[U-Boot-Users] question : difference between booting 2.4 and 2.6 kernel

Hi all,

I would like to modify the uboot so that it could boot up 2.4 and 2.6 kernel without downloading the u boot again . what i know the difference is : 2.6 kernel know how to copy itself to memory but 2.4 do not and need bootloader to do it. Am i right ? How can i do this inorder to make it more convinent ?

Regards, TOM