You have to set the controller to SATA AHCI, you can't use the controller in RAID mode with Linux. This is stated on page 6 of the Quickspec https://h20195.www2.hpe.com/v2/getdocument.aspx?docname=a00053820enw
There is NOT an S100i Linux driver, if you want RAID you need to use the RAID features built into the OS