This is simple guide to how to use this binaries to update uboot for Cubietruck Plus.
Step:
./sdcard-fwbuild.sh
./sdcard-bless.sh /dev/sdx (/dev/sdx is your target device )
The bin/raw binaries generated from u-boot code located in the Cubietruck_Plus-u-boot repository.
Refer: https://github.com/cubieboard/Cubietruck_Plus-u-boot/blob/master/README.md