Program the FPGA from Linux version 4.1.22-ltsi

I use CycloneV Soc.

I would like to program the FPGA from Linux.
Linux version 3.10-ltsi was able to do by the method of the following page.

However, it can not be done in version 4.1.22-ltsi.
Because device file “/ dev / fpga” does not exist.
How do I program the FPGA from Linux in version 4.1.22-ltsi?

best regard,

You should have a look at this post here:

Thank you for the infomation.

I cannot understand the overlay.dtb file.
I’d like to know more detail for the file.

best regards,