On 02/09/2014 06:27 AM, Sandro Mani wrote: > > On 09.02.2014 09:16, John Morris wrote: >> My goal for the forthcoming LinuxCNC release is readiness for inclusion >> in both Fedora and Debian. >> > Wow exciting, thanks! How are you planning to deal with the realtime > kernel requirement, or is that beyond the scope of your work? The meat of the last year-plus effort was introducing support for the PREEMPT_RT and Xenomai RT kernels, and teaching it to build run-time-selectable modules for all supported thread flavors in one "./configure && make" run. Since PREEMPT_RT has no special build requirements, those RT modules are built and packaged by default, so I hope to 'sneak' them into Fedora, despite lack of in-distro support. You may then "bring your own" RT kernel from e.g. MRG or Planet CCRMA to get hard RT behavior; otherwise, the POSIX "simulator" threads work with no special kernel requirements (but all bets off as far as latency requirements). For those requiring even tighter latency than PREEMPT_RT for e.g. software stepper motor drivers, a 3rd-party repo can supply the Xenomai kernel, run-time libs, and matching LinuxCNC RT modules. RTAI kernel support could be offered in the same way, but for a number of reasons, many (but not all) of us think of RTAI support as deprecated. For more info, here's a short paper presented at last year's OSADL Real Time Linux Workshop: http://static.mah.priv.at/public/paper.pdf Sadly, Debian has beat out the Fedora project by getting an RT kernel into the main repo, just the latest reason I continue finding myself alone running Red Hat-derivative distros among CAD/CAM/CNC/Maker/3D printer circles. I'm considering launching a campaign in the Fedora community to raise attention these issues, but don't yet know where to begin. I heard previous inquiries were shut down hard, but maybe the context has changed since the last time. John -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
