"The debate over how best to outfit Linux for real-time
embedded duties has shifted gears, with the recent decision by
Linux heavyweight Red Hat Inc. to use Finite State Machines Labs'
RTLinux technology as its standard approach to hard real-time
application requirements. FSM Labs (Socorro, N.M.) and Red Hat
(Durham, N.M.) have signed a memorandum of understanding covering
cross-promotion, resale and joint development.
The move heats up the debate over whether it's better to enhance
the real-time capabilities of the Linux kernel itself - the
approach of Red Hat rival Monta Vista Software Inc. - or to use a
separate real-time kernel, like RTLinux, in conjunction with Linux.
Unlike Linux itself, RTLinux is based on a patented technology and
is not open-source.
At the heart of the issue is the question of maintaining the
"purity" of the popular open-source Linux operating system."