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Could we make this a sticky.

Fix for RPi-firmware errors see this post:
forum.linuxcnc.org/9-installing-linuxcnc...-64?start=110#290282

forum.linuxcnc.org/9-installing-linuxcnc...-64?start=110#290282

Has the fix.

On the 7I96S there are 4 MPG channels built in with any standard firmware
These use the isolated inputs 0..7 but do not interfere with normal input use.

The count pins on the isolated I/O are:

hm2_7i96s.0.inm.00.enc0-count
hm2_7i96s.0.inm.00.enc1-count
hm2_7i96s.0.inm.00.enc2-count
hm2_7i96s.0.inm.00.enc3-count

There is also 7I96S firmware that puts MPG encoders on P1:

7i96sd_mpgp1.bin

Its MPG encoder count pins on P1 are:

hm2_7i96s.0.inm.01.enc0-count
hm2_7i96s.0.inm.01.enc1-count
hm2_7i96s.0.inm.01.enc2-count
hm2_7i96s.0.inm.01.enc3-count

These are additional to the MPG inputs available on the isolated I/O

If you are using buttons/MPG on P1, the  7i96sd_mpgp1.bin
is probably the best as it also uses the INM module so has built-in
debounce on all inputs.

1. What Ethernet chip does the host PC have?

2. What is the result of running:

sudo chrt 99 ping -i .001 -q -c 60000 [fpga_card_ip_address]

[fpga_card_ip_address] = 10.10.10.10 or 192.168.1.121 depending on card setup

The command will run for 1 minute and print Ethernet timing statistics

I ask about the Ethernet chip type because more recent kernels have a Realtek driver
that has terrible real time performance and must typically be replaced by the DKMS
driver.