it isn't too hard to build a rt_preempt kernel.  I have done it a few 
times now with the help of peters instructions..

cd ~
sudo apt-get update
sudo apt-get install build-essential bin86 kernel-package libqt4-dev 
#libncurses5-dev pkg-config
mkdir rtlinux
cd rtlinux
wget ftp://ftp.kernel.org/pub/linux/kernel/v4.x/linux-4.4.7.tar.xz
wget 
https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patch-4.4.7-rt16.patch.gz
tar -xpf linux-4.4.7.tar.xz
gunzip patch-4.4.7-rt16.patch.gz
cp patch-4.4.7-rt16.patch linux-4.4.7
cd linux-4.4.7
cat patch-4.4.7-rt16.patch | patch -p1
make xconfig
make -j4
sudo make modules_install
sudo make install

This was 4.4.7 - I think I am running a bit newer now...  (change the links 
accordingly)

4.4.9-rt17 #1 SMP PREEMPT RT Sun May 15 20:22:00 CDT 2016 x86_64 GNU/Linux

Also - make sure when you run the make xconfig you select 'Fully Preemptable 
Kernel (RT)'

sam




On 06/17/2016 08:38 AM, Todd Zuercher wrote:
> Well that kind of sucks.  So the one kernel that does completely work with 
> Jessie isn't available.  Anyone have a link to a repo where it can be found, 
> or could someone who has it add it to linuxcnc.org/dist/ jessie base?  I've 
> been hunting for it for the last 2 days, thought it was something I was doing 
> wrong.  And I've been striking out trying to compile a current version of 
> Linuxcnc (JA14) from get using the RTAI kernel.
>
> ----- Original Message -----
> From: "Sebastian Kuzminsky" <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Sent: Thursday, June 16, 2016 4:45:27 PM
> Subject: Re: [Emc-users] RTAI Kernels?
>
> On 06/16/2016 02:22 PM, Todd                      Zuercher wrote:
>> On a different tack, where does one find a Preempt-RT patched kernel for 
>> Jessie?
> That one comes from debian.org, not linuxcnc.org.  The debian folks
> publish it only occasionally; when they do it's available in
> jessie-backports.  It's been a while since I've seen one there.
>
>

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