The people using RTEMS have self-selected for building extremely reliable systems. They have preferentially maintained ports to targets that they can use for th

The people using RTEMS have self-selected for building extremely reliable systems. They have preferentially maintained ports to targets that they can use for that. A popular chip without a port hints that they have not found it a good choice for building their extremely reliable systems. Not everything has to be especially reliable. Cheap is a merit of its own, as is, often, newness. Targets with maintained ports are often slower, less capable, less kitted out than what catches your eye. But if it has been out for some time without a port, it is very possible it is because it was tried and rejected for reasons. You are not obliged to find their reasons persuasive, but it might be wise to find out what they are.