Schooner and Robert, OK, here is what I see when I run those tests. Rather than grep the results of uname -r, I just printed out uname -r.
machinekit@beaglebone:~$ cat /sys/kernel/realtime cat: /sys/kernel/realtime: No such file or directory machinekit@beaglebone:~$ cat /boot/config-4.19.23-bone-rt-r22 | grep CONFIG_PREEMPT_RT_FULL=yes machinekit@beaglebone:~$ machinekit@beaglebone:~$ uname -a Linux beaglebone 4.19.23-bone-rt-r22 #1stretch Sat Feb 16 22:07:49 UTC 2019 armv7l GNU/Linux Actually looking at /boot/config-4.19.23-bone-rt-r22 here is what I found with respect to CONFIG_PREEMPT_* CONFIG_HAVE_PREEMPT_LAZY=y CONFIG_PREEMPT_NONE=y # CONFIG_PREEMPT_VOLUNTARY is not set # CONFIG_PREEMPT__LL is not set # CONFIG_PREEMPT_RTB is not set # CONFIG_PREEMPT_RT_FULL is not set Even though machinekit “runs” i.e., starts up, it is clear that rt-preempt is not configured correctly to run machinekit in realtime. I can’t run my linux pc at the moment to look at how that config should be set, but I believe that at the very least these changes should be made # CONFIG_HAVE_PREEMPT_LAZY # CONFIG_PREEMPT_NONE # CONFIG_PREEMPT_VOLUNTARY is not set # CONFIG_PREEMPT__LL is not set # CONFIG_PREEMPT_RTB is not set CONFIG_PREEMPT_RT_FULL=y Thanks, Alan > On Feb 19, 2019, at 1:42 AM, [email protected] wrote: > > That is one way to deal with it. > rtapi_compat.c first checks the env var FLAVOR, before trying to determine > other ways > > Run these tests from a terminal and let us know what result you get > > cat /sys/kernel/realtime (should return 1) > cat /boot/config-<kernel-version> | grep CONFIG_PREEMPT_RT_FULL=yes ( > should return CONFIG_PREEMPT_RT_FULL=yes) > uname -a | grep 'PREEMPT RT' ( should return PREEMPT RT - but we already > know it won't) > > There is something screwy about the 4.19 kernel and rt. I stopped using the > Debian rt-amd64 version and reverted to 4.18 because of problems > > > On 19/02/19 04:44, mugginsac wrote: >> Robert just furnished a new test image. It definitely has an rt-preempt >> kernel, when I exported FLAVOR=rt-preempt, it ran machinekit. >> However, before I exported FLAVOR=rt-preempt, machinekit tried to run the >> posix realtime stuff (term of art). >> >> So, the question is how does machinekit try to determine the nature of the >> kernel that it is running on? >> >> Robert asked if we should just set FLAVOR=rt-preempt in the environment when >> we create the uSD. Is that acceptable? >> >> >> -- >> website: http://www.machinekit.io <http://www.machinekit.io/> blog: >> http://blog.machinekit.io <http://blog.machinekit.io/> github: >> https://github.com/machinekit <https://github.com/machinekit> >> --- >> You received this message because you are subscribed to the Google Groups >> "Machinekit" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] >> <mailto:[email protected]>. >> Visit this group at https://groups.google.com/group/machinekit >> <https://groups.google.com/group/machinekit>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > -- > website: http://www.machinekit.io <http://www.machinekit.io/> blog: > http://blog.machinekit.io <http://blog.machinekit.io/> github: > https://github.com/machinekit <https://github.com/machinekit> > --- > You received this message because you are subscribed to a topic in the Google > Groups "Machinekit" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/machinekit/J9A7m9c8k74/unsubscribe > <https://groups.google.com/d/topic/machinekit/J9A7m9c8k74/unsubscribe>. > To unsubscribe from this group and all its topics, send an email to > [email protected] > <mailto:[email protected]>. > Visit this group at https://groups.google.com/group/machinekit > <https://groups.google.com/group/machinekit>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout.
