question about xilinx micro kernel

in its edk (embedded system development kit), xilinx provide a micro kernel for the microblaze/ppc405 core in some types of its fpgas. based on xilinx's doc, this micro kernel is like an rto, provide a services (such as preemptive scheduler, posix interface, etc) to the application. i am thinking about using this micro kernel to develope my application. i have a couple of general questions here:

  1. anybody has experence with this micro kernel? how is it?
  2. there are a doze of (very expensive) rtos developed for microblaze/ppc405, such as mv linux and vxworks, if xilinx micro kernel can do the same thing, why should i pay for these rtos?

any inputs are highly appreciated.


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