[U-Boot-Users] NFS TFTP problem

I have enabled nfs booting on ppc based embedded board. I had placed my kernel and rootfs in tftp directory, and had set the u-boot enivironment varialbes as: setenv bootfile /image/kernel setenv root_path /tftpboot/image

The board was booting with this configuration...

Now I have placed the kernel image and rootfs in /exports directory and have set the uboot variables as: setenv bootfile /exports/image/kernel setenv root_path /exports/image

I am not able to boot the board with the above directory. I am getting the error

Loading: T TFTP error: 'File not found' (1) Starting again.

TFTP by default looks for /tftpboot directory.. How can we make the server to fetch files apart from the default one??