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What does
uname -a
In a terminal return?

I remember seeing Scott's post about the max velocity, I forgot to bump it up, now it's set to 2x the max gui velocity, thanks.

Increasing the base frequency did not result in any mesurable improvement, still fails at about 38KHz.
I've tried 60KHz 80KHz and 100KHz, updating each time with the command sudo halcompile –install remora-eth-3.0.c

Do you get latency warnings when running LinuxCNC?
If not, do not change anything.
If yes, download the Wheezy ISO and boot from USB, start your config by right clicking on the .ini file, open with, type linuxcnc and press enter.

Hello,
I have the same issue with my 7i96S card. It works for 2 years without problem, and once it has a communication error.
On the startup, linuxcnc shows the message you can see in the attached photo.
The fpga boots properly (led flashes, and turns off). The 5VDC power supply is ok, the ethernet cable is tested.
System is Debian 10 with LinuxCNC 2.8.4. In linux on the taskbar, the network connection shows the network is connected.
The IP jumpers are set to EEPROM (10.10.10.10).Attached photo shows the ping 10.10.10.10. results. 
The IPv4 settings are attached.I see you mentioned testing a card with ip: 192.168.1.121.

Can you help me to configure the ethernet connection for this IP?

Result of the "ip a" command is attached.On the Rj45 connector just the green led lights/blinks, the yellow never (nieter during ping).

What can be with a card, can you help me to solve it?

Hi
Before installing linuxcnc I need to have a real-time kernel for my orange-pi 4 lts.
I could'nt fine any ready .deb file to install on my board so I've tried to compile one for myself.
But so far I failed over and over again.
I dont know what should I do. Can anyone please help me how can I get through this?
The procedure that I went through:

I've downloaded a 5.10.41 kernel from:
mirrors.edge.kernel.org/pub/linux/kernel/v5.x/

Then I've downloaded the rt patch (5.10.41-rt42) from:
cdn.kernel.org/pub/linux/kernel/projects/rt/5.10/older/

Then I patched it to the kernel, and then used a cross-compiler to compile it:
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- xconfig
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j8 deb-pkg

Then I copied the result created .deb files into my board and then install. but nothing happens and it doesn't switch to new kernel after reboot.
I even manually configure the u-boot settings in order to find and recognize my new kernel files but after doing this the board doesn't boot up at all and just stuck in boot.
what can I do??