Been learning RTLinux and RTAI these days. Linux OS is not preemptible kernel,but a user-oriented operating system.In particular, the kernel is non-preemptible and the scheduling/prioritization schema is fairness-based.
I think the why I couldnot use the real-time kernel..
RT-Linux is the original hard real time Linux variant.It patches the kernel to trap promiscuous disabling interrupts and replaces them with software macros under the direction of a real time executive.
There are many successful cases using RTLinux ,such as DAQ,Industry Control etc. I am sure that it should be a better choice for embedded system to meet the requirements of system.
but RTLinux have a great bug that realtime task couldnot call the services provided by the linux ,such as TCP/IP service.
So in order to have these functions,we can port the LWIP TCP/IP stack in it,which is a restrict protocol stack for embedded system mainly.
I am planing to porting RTLinux +linux to s3c2410,and use the lwIP protocol stack. RTLinux have two versions,pro and free. the free version could not support arm9 now.but the pro does,it need linux 2.6 kernel firstly.
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