I think low level programming that gets envolved with hardware is on topic here, but that particular question was overly broad, ambiguous, and it is not clear what is really being asked. If people are voting to close it, it is probably for those reasons. That was definitely my reason.
I remember seeing it initially and didn't know what you meant by a "real time core". I thought it had something to do with a FPGA, so I skipped it. I see now that you were apparently asking about a real time OS (RTOS) or kernel. That's very different. If you got downvotes, it may have been due to this confusion cause by unconventional use of words.
In any case, I think the problem is not the overall topic but your question in particular. I think the description for not a real question fits pretty well.