This project is based on http://gitorious.org/rockchip-android/tools

build required: git， gcc， libssl-dev（for md5 checksum）  
apt-get install  git gcc libssl-dev

Get source code & build
git clone git:/jhonxie/rk2918_tools.git  
cd rk2918_tools
make

Several executable bins are built:
img_unpack  固件新格式转旧格式   
img_maker	固件旧格式打包成新格式  
afptool		旧格式固件打包解包工具  
mkkrnlimg  pack kernel or ramdisk to add KRNL head and CRC checksum

PS: the rkflash tool not implemented in this project, you can find it here: http://forum.xda-developers.com/showthread.php?t=1286305