Just a short summary on my attempts of running xpenology on an HP Gen10.
I used the 918+ 1.04 loader and the latest DSM 6.2.2 image.
Install worked without any problems visible initially. Only later I noticed, that the system was only using 4GB of the 8GB of RAM installed (kernel log says due to faulty HP BIOS).
DSM operated just fine, network cards (2x 1GBE onboard, Broadcom) were supported out of the box, no addition of e1000e needed.
I don't own the system anymore though as I returned it due to the 4 vs. 8GB RAM issue and the fact that it wouldn't work with my PCIe DVB-Card (timing issues on the PCIe-Bus).