i want Disassemble an vxworks system,vxworks system have a elf image file,,and i use IDA Pro Disassemble it ,but have a problem.

http://www.routerclub.com/attachments/Snap1a_NP0RpFNROu4B.gif

this system is a bas system, it use network card mac address to register it.
underside is the system file.

ftp://61.161.79.48/router/vxwork.rar