Chaning Bootdelay and rebuilding u-boot

Hi all

I changed the Bootdelay in the am335x_evm_defconfig to 0. I can see also the zero value in the .config file.
The problem is that always when I flash the U-Boot to the SD Card and put it in the BeagleBone Black i havee bootdelay=1 (print bootdelay) in the u-boot environment.

Where does this come from?

Thanks a lot