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FSF.org: A Novel Approach to Real-time Free Software

Jun 04, 2002, 01:00 (2 Talkback[s])

"Real-time Free Software solutions are moving forward with the first release of ADEOS[1], a hardware abstraction layer allowing a real-time kernel and a general purpose kernel to co-exist. RTAI[2] will eventually use ADEOS services, thus offering a real-time kernel based on a principle clearly different from the 5,995,745 US Patent[3].

"ADEOS implements a combination of principles[4] published in the early nineties. A core idea was described in the SPACE 1991[5] proposal and consists of a tiny layer that dispatches the hardware resources between multiple concurrent operating systems. ADEOS is a nanokernel that can service a real-time kernel with the highest priority and a general purpose kernel with the lowest priority. Some Free Software real-time solutions favored a different approach where the real-time kernel runs the general purpose operating system, as described in claims 1 and 7 of the 5,995,745 US Patent (1996).

"Philippe Gerum implemented ADEOS and released it under the GNU GPL in June 3, 2002[1]. "My primary motivation was to be able to keep contributing Free Software using a patent free technology. My work was directly inspired by Karim Yaghmour's[6] paper published in February 2001[4]. It grounded the implementation onto an original and solid theoretical background" says Philippe Gerum..."

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