Progress has been slow with the kernel stuff. I was able to build a non PREEMPT_RT image for the Odroid N2++ and get it to boot yesterday. Initially you need to boot from petitboot which sits on flash storage. Step 2, adding the PREEMPT_RT patches failed after that. It seems the armbian kernel 6.1 is a bit behind kernel.org so some of the patches from November failed.
Kernel 6.2 is released today. My plan is to move to Armbian Edge which already runs the 6.2 kernel before continuing. I need to get that sorted bere trying xenomai Gene, the Armbian build environment is run on an amd64 environment. I have to say playing with kernels has shown you need a PC with 8-10 cores to get it done in a reasonable time which is something my 10 year old i7 does not have! Rod Webster *1300 896 832* +61 435 765 611 Vehicle Modifications Network www.vehiclemods.net.au On Sun, 19 Feb 2023 at 03:15, gene heskett <ghesk...@shentel.net> wrote: > On 2/18/23 11:31, Small Shop Concepts wrote: > > That sounds awesome Rod! I am interested in your Xenomai 4 test results. > > > > On Fri, Feb 10, 2023 at 3:53 AM Rod Webster <r...@vmn.com.au> wrote: > >> > >> I was lucky enough to attend an Ethercat working group seminar today in > >> Brisbane, Australia where German based Martin Rostan, Executive > Director > >> from the EtherCAT Technology Group (ETG) was the main presenter. > >> > >> It was all very interesting and the detailed low level description of > >> ethercat packets and alternatives based on TCP makes Ethercat streets in > >> front of other alternatives because of the sheer efficiency of the > >> protocol. This let me understand the issues causing the error finishing > >> read error being experienced with hm2eth connected devices (ie mesa > >> ethernet cards) in later kernels (5.10 and above). > >> > >> I was also able to speak with Martin about the licensing issue > >> preventing us from including the Linuxcnc ethercat driver in our > >> distribution and have a greater understanding of the problem. Their > >> license requires users of an ethercat master (in this case the iGh > Etherlab > >> master we use) to become members of the ETG (which is free). Anybody > >> selling machines would need to adhere to this. So technically, we can't > put > >> that condition on to our terms because the existing GPL licence > >> from Linuxcnc propagates to the ethercat driver. He did go on to say > that > >> they would never take action against somebody promoting use of ethercat > >> masters. > >> > >> So back to the error finishing read problem (that can't be solved by > wide > >> scale adoption of ethercat), I recently purchased an Odroid N2+ Arm > based > >> PC which arrived today. I was hoping the different platform may improve > >> network latency. I have been able to compile an Armbian bookworm image > >> which booted OK. A user on the Armbian forum is willing to help me > with > >> building a PREEMPT_RT image following this prerequisite first step. but > his > >> main interest is in Xenomai 4 and he is keen to help me subsequently > build > >> Xenomai for the N2+. Xenomai seems to have a significant advantage over > >> PREEMPT_RT re latency. Given we already support Xenomai 3, I am hoping > it > >> will be a fairly simple matter to support xenomai 4 and build a test for > >> network latency to look at differences between xenomai and preempt_rt. > >> > >> So I am sure progress will be slow, but I am hopeful we will come up > with a > >> solution to error finishing read! > >> > >> I hope some of you are interested in this ChatGPT free update! > >> > >> Rod Webster > >> > I too would be interested in Xenomai 4 as applied to armhf/arm64 stuff. > The kernel I first built as preempt-rt for the pi's has been decent but > is getting long in the tooth and although the installation of it on > armhf stuff is dead simple, its not really well fitting into the apt > update scheme, apt in fact ignores it. And while it can & does install > new kernels, it does not disable mine. So its safe to sudo apt update etc. > > I am equipt to build kernels on my rpi4, or linuxcnc. And I keep > linuxcnc uptodate from github here. So I can supply another native build > environment for testing. Just ask. > > >> VMN® > >> > >> www.vmn.com.au > >> > >> Ph: 1300 896 832 > >> > >> Mob: +61 435 765 611 > >> > >> _______________________________________________ > >> 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, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/> > > > > _______________________________________________ > 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
