Great! It sounds like you’re making good progress.
Do you need to load (or reload) the RBF after Linux is booted? The .periph and .core files are part of the “early io release” strategy which I believe is required for partial reconfiguration. You will only get one RBF if you do not have this enabled in Quartus. If you want to re-load the RBF after boot then I believe you must use the early io release strategy and partial reconfiguration. In order to do that with Linux you must use the Device Tree Overlays that Altera supplied and up-sourced in the 4.x kernel releases. You no longer can “dd” an RBF to the FPGA as was done in CV.
It been on my radar but I’ve not yet re-loaded an Arria10 from Linux using the device tree overlay method. So for that I will not be much help. Here are a couple links I previously saved to look at later when I got around to it.
They use the device tree overlay strategy in this workshop
Hints on reloading after boot
A quick presentation on “early io release”
Cheers!