take uboot off

			sudo dd of=tftpboot/u-boot.bin if=$(SD_CARD) seek=1 skip=1 bs=512 count=600

put uboot back on:

			sudo dd if=tftpboot/u-boot.bin of=$(SD_CARD) seek=1 skip=1 bs=512


ip=$(ipaddr):$(serverip):$(gatewayip)