Only one of the gantry joints move

I was under the impression that kinstype=both only changes the behavior before homing. I will, however, try that later today.

Alright, I figured it out!

Thanks for your time Aciera, RodW, tommylight and PCW, your efforts might not have immediately helped me and instantly solved my problem, but they kept me trying. And in the end solving it.

the solution was to edit a line in the hal file.
I changed "loadrt trivkins" to "loadrt trivkins coordinates=xyzy kinstype=b". I have not previously seen coordinates=xyzy added to the hal in any mentions. I found it looking up where I had to add kinstype=b, since I initially added it in the ini and it didn't change anything.
Maybe this should have been obvious, but to me at least it wasn't.

Thanks again for your time and efforts, I really appreciate it!

As an alternative This would then grab the 'KINEMATICS' entry from the KINS section in your ini file.

Okay, that's good to know. I just assumed that the hal didn't care at all about the kinematics. From what I gathered, the hal was mostly responsible for pin mapping and signal routing.

Had I known that I had to add anything about that into the hal, I'd have been much less frustrated.

Well, as per usual, one's always smarter afterwards. (This doesn't translate as well as I hoped it would)

Thanks again.