Hi wstearns, I now use the UML to do my jobs. However, it is my first time to use the system, and met a problem in building my own root_fs. I downloaded the scripts in http://www.stearns.org/mkrootfs/ and run the commands # ./mkrootfs It run not very well but finially finished and got a file 'root_fs'. I booted the UML using the file. # linux ubd0=root_fs It was so pity that it didn't work and said: Kernel panic - not syncing: No init found. Try passing init= option to kernel. How to do next? Could you give me some advices? Thanks a lot~ ------------- Qin An 2007-01-17 Research Center for Grid and Service Computing Institute of Computing Technology, Chinese Academy of Sciences P.O.Box 2704, 100080, Beijing, China Tel: 86-10-62600974 Email: qinan@software.ict.ac.cn