I'd say something is better than nothing so if we can produce a LiveDVD
with Debian 9 and preempt-rt and LinuxCNC Uspace we should.
I had some partial success creating a live cd this morning with no
desktop but with the rt kernel and LinuxCNC but it did boot so I'll
attempt again tomorrow to add a desktop then I'd need to add the installer.
Recently I've built Lubuntu 18.04 with rt-preempt and LinuxCNC with
surprisingly low latency. I still need to test my Debian 9 latency to
get a 1 to 1 comparison on the same pc.
JT
On 5/22/2019 7:31 AM, andy pugh wrote:
We have a problem...
We need a 2.7 LiveCD that works.
We will need a 2.8 LiveCD that works.
Currently there is a 2.7 LiveCD running preempt-rt waiting in the wings.
That is based on Stretch and so will be usable until June 2020. (ie, one
more year)
LinuxCNC has historically used RTAI, and this has tended to give better
results for software stepping with the parallel port.
We have a LiveCD based on Wheezy and RTAI but that is currently somewhat
broken (the apt sources list points at files that are no longer there now
that Wheezy is a long way past EOL)
I have tried to respin that ISO using the archive repositiories. So far
that isn't going all that well.
Do we switch to the (working) preempt-rt Stretch ISO and abandon RTAI?
Has anyone made RTAI work with a Linux version that is currently current? I
have tried compiling for kernel 4.9 with Stretch and whilst it compiled and
ran, and LinuxCNC compiled against it, nothing useful happened when I tried
to run LinuxCNC.
What I hoped we could do (urgently) is switch to the preempt-rt stretch
image with an alternate download link to a (fixed ) Wheezy RTAI ISO with a
disclaimer that we know it to be ancient.
I guess we could link to it with a note that "This is so ancient that you
will need to edit the apt sources before anything will work"
Thinking further ahead: What OS and realtime system should we plan to
release 2.8 on?
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