GentooPreemtrt - rmu75/linuxcnc-wiki GitHub Wiki

https://github.com/NTULINUX/ntu_overlay/tree/main/sci-electronics/linuxcnc

1. TODO:
2. Fix documentation install directory (upstream bug?)
3. Add CNC category to graphical menu drop-down
4. Implement USE flags
5. Check for PREEMPT_RT
6. Maybe RTAI at some point
   

As the performance differences between preemptrt, rtai and xenomai are small and the preemptrt kernel is easy to build I used this way.

toc

you can skip this and the following step if you just want to simulate machining on your Gentoo system

 emerge -av sys-kernel/rt-sources

cd to the directory where the rt-sources got installed /usr/src/linux-[versionnumber]-rt[revision], e.g.

 cd /usr/src/linux-4.13.13-rt5

copy .config of a working kernel to this directory

 cp ../linux/.config .

then

 make oldconfig

answer the stuff and enable all the things needed for realtime make sure your .config contains

CONFIG_PREEMPT=y
CONFIG_PREEMPT_RT_BASE=y
CONFIG_PREEMPT_RT_FULL=y
CONFIG_HIGH_RES_TIMERS=y

build the kernel

 make all

install the modules

 make modules_install

copy the bzImage to /boot and make grub or whatever you use find it

reboot the new kernel and make sure it works

update the link to the kernel source where linux-4.13.13-rt5 has to be set according to the Version you use e.g. cd /usr/src && rm linux && ln -s linux-4.13.13-rt5 linux

Download upload:linuxcnc-ebuilds-2.7.11.tar.xz

cd to /usr/local and untar the Download there

 cd /usr/local && tar Jxvf /PATH/TO/THE/DOWNLOAD/linuxcnc-ebuilds-2.7.11.tar.xz

make sure your make.conf contains a line like

 PORTDIR_OVERLAY="/usr/local/portage"

if you need modbus (If you don't know what it is, you don't need it.) for your machine add the useflag to linuxcnc e.g. add the following line to /usr/portage/package.use or a file in /usr/portage/package.use/ sci-misc/linuxcnc modbus

add the following line to your /etc/portage/make.conf You should remove this line when you are done. Anyways I couldn't find a way to get the ebuild preventing portage from bzip2ing the minimal sample files and this is a problem as the linuxcncgui is making heavy use of them and can't read them when they are zipped.

PORTAGE_COMPRESS=""

unmask sci-misc/linuxcnc and depencies and emerge emerge -av sci-misc/linuxcnc

if you forgot to unmask something the latter command will ask you to do this automatic. You can let it do that. It will not write the changes to the real files yet. You can use etc-update interactive to make those changes real. Be carefull, with this tool. Be patient and don't mix commands with - with numbers e.g. -1 is not the same as 1 !

read the messages I've put in the ebuild.

when you're done remember the make.conf line

good luck

get rid of the make.conf line change useflag for installing the whole documentation

I knew the stuff when I wrote this manual here and the ebuilds. It's mostly obsolete for use but maybe helpfull for improve the ebuild. EmcOnGentoo https://sourceforge.net/projects/gentoocnc/ http://gpo.zugaina.org/Overlays/booboo/sci-electronics/linuxcnc https://dallasmakerspace.org/wiki/User:Peter242/Gentoo_for_LinuxCNC The zugaina link gave me preview to linuxcnc 2.8_pre I don't remember what it was but somehow it didn't work on my machine when I tried it, but looks interesting.

If you have any suggestions, questions or improvements you can reach me via my mail form: http://reiseradgabel.de/english/mail (This gives me less spam as putting my email address here.) Please keep in mind that generic LinuxCNC questions are better addressed somewhere else.