Re: [Emc-users] Custom EMC installation?

[Peter C. W. <pc...@me...>]

On Sat, 28 Mar 2015, Neil wrote:

> Date: Sat, 28 Mar 2015 18:01:31 -0400
> From: Neil <emc...@na...>
> To: "Enhanced Machine Controller (EMC)" <emc...@li...>
> Subject: [Emc-users] Custom EMC installation?
> 
> Hi all,
>
> I've been out of touch with linux for a decade now, so wondering if it
> would be relatively easy (ie: fairy well documented and fairly bug free)
> to install EMC on my own distro.  Perhaps on Ubuntu 14.04.  Essentially
> I want to get 2 things installed on the same OS... EMC and openPnP.  If
> you want to gory details, read on:
>
> Installing openPnP was simple, and includes the required openCV, but
> that version (apparently 2.4.9) requires GLIBC 2.15.  The Debian
> distribution of EMC I have has EGLIBC 2.13  Apparently if I try to
> install a later version of GLIBC/EGLIBC, I'll break several other
> things.  OpenPnP is supposed to check and use my openCV first, so I
> (painfully) managed to install openCV over the course of a week or so,
> fixing various odd bugs/issues with openCV, cmake, and java. But openPnP
> does not seem to recognize it.  I tried openCV 2.4.10 and 2.4.9.
>
> So my alternate plan is to install EMC2 on ubuntu 14.04 (which I lean
> towards only because I already have it installed on a different
> partition and which runs openPnP fine).  But EMC2 requires real-time
> kernel extensions, which I'm worried would be painful to install
> (haunting memories of kermel compiles from years ago ;).
>
> Again, I point out that I'm not fluent with linux anymore.  What path do
> you think I should go with this?
>
> Thanks.
>

I have linuxcnc running on ubuntu 14.04 using a preemt-rt kernel
this may or may not have good enough latency for a software stepgen system
depending on your PC hardware and performance requirements

https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO

has instructions for building a preemt-rt kernel (and heres a script)

cd ~
mkdir rtlinux
cd rtlinux
wget ftp://ftp.kernel.org/pub/linux/kernel/v3.x/linux-3.18.9.tar.xz
wget 
https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/patch-3.18.9-rt5.patch.gz
tar -xpf linux-3.18.9.tar.xz
gunzip patch-3.18.9-rt5.patch.gz
cp patch-3.18.9-rt5.patch linux-3.18.9
cd linux-3.18.9
cat patch-3.18.9-rt5.patch | patch -p1
make xconfig
make
sudo make modules_install
sudo make install

I have a working .config here if you dont want to mess with all the kernel 
options settable with xconfig

freeby.mesanet.com/rtconfig
(move to linux source directory and rename to .config)
Note that this enables about every hardware driver you can imagine so takes a 
while to compile

and something close to this will build the uspace version of 
linuxcnc (for the preemt-rt real time kernel) from source

cd ~
sudo apt-get install git-core gitk git-gui
sudo apt-get build-dep linuxcnc
sudo apt-get install libudev-dev
git clone git://git.linuxcnc.org/git/linuxcnc.git linuxcnc-dev
cd linuxcnc-dev
git checkout 2.7
git pull
cd src
./autogen.sh
./configure --with-realtime=uspace
make
sudo make setuid
cd ..
. scripts/rip-environment





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Peter Wallace
Mesa Electronics

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