Ethercat drives not responding, mesa error finishing read

sudo ./pinirq_2025-10-07.sh enp5s0
returns
"Cores: 8
Old CPU Mask: ff
./pinirq_2025-10-07.sh: line 18: echo: write error: Value too large for defined data type
Set device enp5s0 IRQ 30 CPU mask to ff"

That's an odd error since the new mask should be 128=080H
and the existing mask is 255=0FFH
 

I've installed Debian 13 (kernel is 6.12.48) on a different computer, and attempted to build linuxcnc and ethercat from source as described at  forum.linuxcnc.org/ethercat/54712-etherc...ons-updated-for-2024 and the results are the same:
returned Failed to upload SDO: Input/output error 7 out of 12 tries.

Now I wonder if there is actually a problem with LinuxCNC and ethercat, or if the drives are doing something strange.

Try this small example config. That should make one axis work.
If it doesn't it is much easier to troubleshoot.
github.com/dbraun1981/hal-cia402/tree/main/example

 

I can try it, but since ethercat at the command line (linuxcnc isn't even running) shows ~50% lost uploads, what's the point?

I don't think this is a linuxcnc problem, but rather some networking or drive problem.

sudo apt install wireshark
monitor the network card to see what is going on, look for retransmissions