On Tuesday 05 March 2019 21:11:19 Phillip Carter wrote: > This DIY tutorial may be of interest. > > <https://howicode.com/blog/2018/07/raspberry-pi-preempt-rt-patching-tu >torial-for-kernel-4-14-y > <https://howicode.com/blog/2018/07/raspberry-pi-preempt-rt-patching-tu >torial-for-kernel-4-14-y>> > > Cheers, Phill. > Thats nice Phill, but its about 2 years out of date, and needs a new rebuild to accept the newer video libraries now available. AIUI, the video will be sped up considerably. Something the pi is badly in need of anyway.
I do not see a working contact for this gentleman, so I've no way to contact him to request an update to a 4.19 kernel which should include the majority of these new patches. It also seems to imply its a stretch install, and this one is running jessie. I can backup all the /home/pi/linuxcnc stuffs to an attached ssd so thats not lost and is only a session of mc to restore. If possible, I'd like to jump to buster to image a fresh u-sd card, then install the rt-kernel to it once everything else is running, starting with networking. Is such an image already spun and downloadable from someplace? Thanks. > > 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 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
