Adding custom drivers for Linux-Altera 3.7

Hi all,

I'm currently working on adding a custom FPGA peripherical in an Arrow SoCKIT dev board (Cyclone V), then use it within Linux.

My work is based on multiple tutorials and Workshop documentations:

- Arrow SoCKIT workshop

- Altera Wiki

- RocketBoard tutorial about Arrow and Yocto

- Yocto user manual

I have completed HW part as usual (quartus/qsys), and prepared a simple .sopcinfo based on Arrow recommendation with HPS, sysid, jtag debug IP and one custom IP. I have tested my IP with Qsys system tool, so far everything seems ok.

I'm not sure how to properly add a driver to Linux distribution.

From now I have tried multiple ways to do this:

- I have generated 2 uImage including my driver, one from Yocto the other from arm-eabi compiler as described in Altera-Wiki

- I have generated .dts from .sopcinfo with sopc2dts, wich is very different from SoCKIT prebuild dts.

- I have created a new dts based on original DTS from SoCKIT prebuild + my custom device.

- I have generated multiple DTB with Yocto and stand alone compiler from different DTS

I suspect my uImage are good, but everytime I add a new device on dts the resulting dtb seems to be wrong and Kernel does not start anymore.

Has anyone here already tried and succeeded on adding a custom FPGA IP and access it from Linux system?

Another question, is u-boot spl impacted by this kind of modification? I guess not but I am not 100% sure about that.