Tested "hpsahba" to see if I could get my P410i controller into "HBA"-mode, and it worked on a stock DL380 G7 at least.
To be able to use the drives in unraid, the hpsa module needs a little patch which would be nifty to have as standard on unraid. 🙂
Check https://github.com/im-0/hpsahba for the patch.