sudo aptitude install uboot-mkimage
git clone git://git.openmoko.org/git/qi
cd qi
make CPU=s3c2442 CROSS_COMPILE=arm-linux-gnueabi- COMPILER_LIB_PATH_PRE=/usr/lib/gcc/arm-linux-gnueabi 
dfu-util -a u-boot -R -U backup.udfu
dfu-util -a u-boot -R -D image/qi-s3c2442-master_36bb5c03756268ff.udfu