On Sat, Jan 02, 2016 at 01:08:41PM +0100, Niemand Sonst wrote: > I took the first hurdle, the UEFI Bios and could install Debian 8.2 - > amd64 - MATE, but the second hurdle installing LinuxCNC from the ISO > could not be taken, because UEFI Bios only accept 64-bit operating > systems, even with security boot disabled!
I am sorry you purchased defective hardware. You should consider returning it for a refund if you still can. [...] > After sorting most of the stuff out, I added the linuxcnc repositories: > > deb http://buildbot.linuxcnc.org/ jessie 2.7-rtpreempt > deb-src http://buildbot.linuxcnc.org/ jessie 2.7-rtpreempt > > and installed LinuxCNC. > > OK Latency test shows 32035966 ns, that is the highest I ever got! Even a > virtual machine is better ;-) But i did no optimation till now. It is quite likely that after performing these steps *you are not operating with a realtime kernel*. uspace will run both on vanilla kernels (but without using realtime task priority) and on preempt-rt kernels (using realtime task priority). Only in the latter case (and if your computer has acceptable RT performance) will you get good latency. Unfortunately, a preempt-rt kernel is not currently available from Debian for 8.x -- there *was* one in jessie-backports, but they deleted it. Seb's RTAI kernel for 64-bit systems crashes, so I similarly can't recommend that. However, for developing user interface software, uspace non-realtime is typically adequate. For running attached hardware over ethernet, not so much. I woudln't recommend it even for testing. > After installing "gstreamer0.10-plugins-base" the start went OK. Jeff could > you please add that dependence? Yes. Done. > Neverthereless the code for both GUI must be adapted to avoid such an error, > only for not beeing present "sound". I will fix that as soon as my > new development system is running. > > I do connect the laptop with WLAN0 to the world and want to use eth0 to > connect to a MESA 7i76E to control my testing hardware. > But as far as I found out till now, that will not be possible, because ther > is no realtime kernel for Jessie 64 bit > and the info on buildbot is not correct. So, nobody has written the install instructions for Debian Jessie with preempt-rt. It should be possible using snapshot.debian.org, which still has an archive of the preempt-rt kernel from jessie-backports. (The kernel was withdrawn not because it was broken, but because Debian testing's development moved on to a kernel without a RT patch) http://snapshot.debian.org/package/linux/4.1.3-1/ .. but having just spent 15 minutes trying to do so I haven't yet been successful at getting apt to automatically download and install these packages. > - Does wheesy support 64 bit completly ? I used wheezy with preempt-rt kernel in the past. There is a preempt-rt kernel in main for wheezy. https://packages.debian.org/search?suite=wheezy&keywords=linux-image-rt-amd64 Jeff ------------------------------------------------------------------------------ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
