This DIY tutorial may be of interest. <https://howicode.com/blog/2018/07/raspberry-pi-preempt-rt-patching-tutorial-for-kernel-4-14-y <https://howicode.com/blog/2018/07/raspberry-pi-preempt-rt-patching-tutorial-for-kernel-4-14-y>>
Cheers, Phill. > On 6 Mar 2019, at 12:50 pm, Gene Heskett <ghesk...@shentel.net> wrote: > > Greetings all; > > About 90 days back there were some new kernels and libraries made > available that I've heard sped up the video on the pi's quite a bit. > > But I have the stuff wrapped around the realtime kernel its running > pinned so as not to lose the ability to run my lathe. That file is > here: > pi@picnc:/etc/apt/preferences.d $ cat kernel.pref > Package:linux-kernel > pin: version 4.4.4-rt9-v7+ > Pin-Priority: 1001 > > Package: linux-headers > Pin: version 4.4.4-rt9-v7+ > Pin-Priority: 1001 > > Package: raspberrypi-bootloader > Pin: version 1.20170427-1 > Pin-Priority: 1001 > > Package: raspberrypi-kernel > Pin: version 1.20170427-1 > Pin-Priority: 1001 > > But while they been pinned, apparently the video has been updated and the > older signal paths between the keyboard/mouse, and feedback to the video > have been destroyed to the extent that my sheldon is now no longer > usable. There is now at least a 1 second delay for any keyboard or mouse > event to get to linuxcnc from my fingers, and at least a 1 second delay > between lcnc's movements of the machine, and any update making it back > to the backplot. An because the machine isn't under the usual tight > control I've now destroyed 2 of the very expensive, smallest 3 cornered > threading chips for making external threads. > > So I need a freshly built and installable realtime kernel that is > compatible with the latest libraspberripi.bin and friends, or I'm going > to have to find a D-525-MW mobo and reconvert it to a 7i90 with a > parport interface since theres no such thing as an spi driver for the > x86 boards. Given the rpi communities attitude vis-a-vis machine > controls, (we are being ignored on their many lists and forums, the rare > exception being the linux-arm list) it looks like going back to an intel > driven system is the only choice I really have if I want a useable lathe > again. My biggest problem is where the heck am I going to put a D-525-MW > mobo in the hacked up mess hanging on the riser pole on the back of the > machine now. > > I have several later rt kernels built, right there on the pi, but so far, > despite repeated pleas for instructions on how to install them, nothing > has been offered, and I'm now convinced after 2 years, that the pi folks > would just as soon I took the blue pill and went away. I wish there were > a thousand of me beating on the drums for support, but one voice is > swept away in the multimedia wind. > > So is there a chance of a new kernel, realtime enough to work with > linuxcnc AND take advantage of the new video modes made available in the > last 5 or 6 months which might materialize by the 1st of May, or do I > put a intel mobo on it and install from the wheezy install iso? Does > that involve the wholesale replacement of $200+ worth of 7i90HD+ 3x > 7i42TA's with something else? That, once the noise was whupped, has > Just Worked. I think the question then is, is the intel parport fast > enough to service the 7i90HD over that interface? > > I know that manpower to support one user of this architecture is not > efficient use of your time so if I have to rebuild, I won't be hugely > upset as this is the real world, but while it worked, it worked quite > well. > > So what say you folks? > > Like Douglas Adams, Thanks for the fish. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
