On Sunday 27 October 2019 07:08:30 Andy Pugh wrote: > > On 27 Oct 2019, at 05:39, Tim March <[email protected]> wrote: > > > > The revision # can be different depending on where it was > > manufactured. > > I will run it with my own Pi4 to get some numbers, but if you have > more?
This is interesting as I only have a sample of one. But for my use, driving a bigger lathe, the achievable step rates are too low. So My interface is by an spi driven mesa 7i90HD buffered by a trio of 7i43TA's. ATM, because the armhf version of linuxcnc buildbot was shut down in Sept of 2018 have been building my own right on the pi3, now the pi4 and buster 10.1, and working great. Axis only as gmoccapy was lost when some linux python stuff disappeared from buster. But right now, the pi4 version is running better that the intel versions you are shipping. I have had exactly one, latency excursion reportable to the terminal LinuxCNC was launched from. The intel versions are showing 8 or 10 per running hour. All in no base thread systems. One possible advantage to the rpi4 config is that I have setup a 100 hz thread for the slower stuff, and moved the hand interfaceing stuff to it. So my jog dials I drive it by hand with are only read at the slower rate, but apparently just as fast as you can only turn them so fast. I can set the size of the jog up to as high as .020", which is fast enough to hit the machines speed limits, but I rarely find myself using that big a jog. With the pi4 running this kernel: Linux rpi4 4.19.71-rt24-v7l+ #1 SMP PREEMPT RT Thu Oct 10 15:22:22 EDT 2019 armv7l GNU/Linux Add a git clone of master-rt and a patched hm2-rpspi.c, two python dependency's removed that no longer exist in buste, changing the hm2_rpspi.c's spiclk_rate_rd to 25000, and basicly useing John Thorten's recipe to make my own LinuxCNC I am more than happy with the way its running 2.9.0-pre0. All built right on the pi4 folks. I have that kernel in tgz format, and I can put the lcnc install debs on my web page for very slow access if theres any interest. Docs can be in fr or es formats. LCNC is in uspace, dpkg -i installable. But first I have to make sshfs work to the pi4. The /sshnet/rpi4 directory is screwed up and can't be deleted, nor will it link, claiming the endpoint is not connected for a normal "sshfs pi@rpi4:/ /sshnet/rpi4" attempt. An lsattr shows: gene@coyote:~$ sudo lsattr /shhnet [sudo] password for gene: lsattr: No such file or directory while trying to stat /shhnet Yet 3 other machine named subdirs are currently connected to /sshnet/GO704, /sshnet/lathe (TLM to you folks) and /sshnet/shop are all alive and normally accessible. And this has worked flawlessly until I installed stretch from our wiki's links on this machine to replace wheezy. I finally ran umount /sshnet/rpi4 enough times to get an error, rmdir'd it and mkdir'd it. But it still won't connect: gene@coyote:~$ sshfs pi@rpi4:/ /sshnet/rpi4 fusermount: user has no write access to mountpoint /sshnet/rpi4 But this is user 1000 on every machine regardless of whether its gene or pi. What changed with buster to screw up something thats just worked for a decade or more? Thanks all. > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
