[U-Boot-Users] how to reprogram mac add

Hi

I am using at91sam9260ek board. I am burning the binaries in production boards. I need to change the ip add, mac add and hostnames in each of the boards. The u-boot doesn't allow me to change mac add using u-boot prompt. I have to erase the env vars area and write all info there. Is there any better way than this? Please suggest.

Thanks Avinash