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After using a USB-blaster and a ft2232 board, Ive found the ft2232 board to be the more reliable.
After messing around with the colorlight boards I found they needed quite a bit of rework for use.
So I went with a Spartan 6 dev board and some custom boards and I was able to use Mesa 7c81 firmware built to suit.

I just ordered this board and am gathering information. Has anyone tried flashing it with the USB-Altera-Blaster STM-32?

No gigabit is not required, the mesa boards do not support this speed.
As no based thread is required jitter is not a major issue, under 100000ns will work.

Stop overthinking.
With mesa hardware you don't need a base thread, only a servo thread is required. With that, latency isn't such a huge issue either. Trying to get an extra bit here and there does nothing.
The pre made image Rodw recently linked to is perfectly fine to run a machine, the only exception would be if you are using the RPi 5 spi interface to talk to a 7c81 or 7c80 as this requires a driver that isn't included in Rods image , this is not required for ethernet.
Invest more into learning the ins and outs of hal . This is more important that fussing over software as the images provide what is required, remember the only task these images are meant for is running a CNC machine.
If one reads the online docs one will fine some simple exercises that do not require a CNC machine.

Dear jjdege.
How can you solve the error when you install the ethercat package by command "sudo apt install -y linux-headers-(uname -r) ethercat-master linuxcnc-ethercat?

I think we would have to add the motion color into the plot point.
(qt_mismach.py line 287 ish)

Dear jjdege.
How can you solve the error when you install the ethercat package by command "sudo apt install -y linux-headers-(uname -r) ethercat-master linuxcnc-ethercat?

Good day! Tell me, is a gigabit port absolutely necessary or is 100Mb enough? How important are the jitter readings in the test?

I read your post and it took a while to sink in how well running the native RaspianOS with the 6.12 kernel for what I want to accomplish.  I'm guessing that 6.12+ might be a real game changer across the board but I remember discussions about certain run-time flags being used to determine if PREEMPT_RT was part of the build and people commented that some don't match up yet.

Do you think that might be a hurdle in the short / mid  term?

Do you think someone familiar with the run-time testing code might already be working on a fix to any of those problems?

Ok, I decided to complete a complete re-installation and work from clean. However getting the following:

abcabc@192-168-1-???:~$ apt --fix-broken install
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
I definitely did not put a root password in. So ideas?

Ok, sorted ran sudo apt --fix-broken install

That's awesome - as always!

I've already starting to dig through it.

Interesting, I will check carefully all the encoder connections to see if anything looks suspicious. If I find nothing I will try to swap two motors to see if the error follows the motor.
Thanks for the idea!

OK, then encoder failure, most probably.
Check the encoder connectors, they tend to cause issues on those drives, some even come with wrong encoder wiring sometimes as i read several times here on the forum.
It can also be from interference, but that would also affect other drives/motors.

I think that there is actually a warning about this in the docs.
(Actually it warns of something slightly different, linuxcnc.org/docs/stable/html/gcode/g-code.html#gcode:g76 )

At the beginning of the pass the Z axis is stationary. It sees the index pulse, and then has to "chase" the spindle-synch point.
If the axis acceleration is limited, then I can see that it might have trouble catching up.

What is your Z accel limit? Given that, what distance does the spondle need to catch up to a 100rpm spindle? (v^2 = 2as )

I am running linuxcnc 2.9.3 on a relatively recent pc that i added a diyeeni PCIe parallel port. I am using a nema34 closed loop stepper motor with an HBS860H drive on the Y axis. The breakout board and cable came from amazon nothing crazy there. If you need other more specific information let me know and thanks for the reply.