How can develop a small realtime linux

[niushetuan]

Hello linux colleagues:       I want to develop a small rtos based on linux, the first step in the project, i wish to develop a small rtos, it include a realtime kernal(only implement basic rtos function, no file system), a tcp-ip protocol module, and Debug agent base on tcp-ip, just like as Vxworks, i hope total memory size for kernal + tcp-ip + Debug Agent only about 200k to 300k. On the host, I hope to can using GUN tools as development platform, so that we can develop realtime applications like as VxWorks. i feel this configration can meet about 80% of realtime application. I wish this platform can substitute as VxWorks ,pSOS, VRTX.       Can you give me some information how can to do this, where can i get some materials in these area?       Tanks you very much.          niushetuan        99/07/12