Installing uboot_mkimage

fetch and extract http://my.ddteam.net/files/u-boot.new.tar.gz into /usr/ports/devel/

cd /usr/ports/devel/
fetch http://my.ddteam.net/files/u-boot.new.tar.gz
tar xvzf u-boot.new.tar.gz
cd u-boot.new
make

then find location of mkimage utility in subdirs, and copy it:

find . -name mkimage
cp mkimage /usr/local/bin/uboot_mkimage