Arria 10 aocl diagnose failed

You might be onto something but the driver seems to be loading anyway, or else the "Kernel modules" field from lspci should be empty. I did some searching, it seems to avoid that issue, you either have to recompile your OS kernel with driver signature verification disabled, or get Terasic to sign that driver for you. Take a look here (http://stackoverflow.com/questions/24975377/kvm-module-verification-failed-signature-and-or-required-key-missing-taintin) for more info. As a last resort, you can try CentOS 6.x, I am pretty sure there is no signature verification on CentOS 6.