Only PREEMPT_RT allows access to the full Linux functionality. Xenomai uses a dual kernel concept which is very limited. All custom device drivers need be design to fit into the Xenomai concept which makes things even worse. The performance gain of Xenomai compared to that of PREEMPt_RT is negligible in most cases.
Am Freitag, 21. Februar 2014 12:27:01 UTC+1 schrieb Giuseppe Iellamo: > > Or just try Xenomai... > > https://github.com/cdsteinkuehler/linux-dev/tree/3.8.13-bone39-xenomai > > > Il giorno venerdì 21 febbraio 2014 11:03:24 UTC+1, David Goodenough ha > scritto: >> >> On Friday 21 February 2014 00:20:39 quik...@gmail.com wrote: >> > I am trying to figure out how to create a kernel for the BBB that >> supports >> > PREEMPT_RT. It's kind of strange that the BBB's default kernel does not >> > even have PREEMPT activated. Such a board doesn't fit to many embedded >> > applications where we need at least some kind of determinism. It is >> even >> > worse, that nobody seems to care about this problem. Contrary to that, >> the >> > Raspberry PI's standard kernel has PREEMPT activacted from the very >> > beginning. >> > >> > I have tested Robert Nelsons kernel 3.8.13-r9 >> > (https://github.com/beagleboard/kernel/tree/3.8-rt). It does not have >> > PREEMPT_RT activated by default. When doing so, it does not boot. But >> > activating PREEMPT does work. However, development of this branch has >> > stopped several months ago. The official source for RT Linux (3.8.13) >> has >> > evolved since then. Meanwhile there's an rt17 patch set >> > (https://www.kernel.org/pub/linux/kernel/projects/rt/3.8/). Did >> anybody >> > give this a try? Does it work with the BBB? >> Surely the point of the Beaglebone, or rather its processor, is that you >> do not need to put the time critical bits on the main processor, you put >> them in the PRUSS processors. >> >> David >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
