I have a new install of DSS7 that is hanging at the "SYSLINUX EBIOS" screen.
The installation itself (from a CD iso burned to a USB thumb drive) boots, detects all hardware and installs to the boot drive ok.

Specs:
Supermicro X8DTU motherboard (dual CPU) 48GB RAM
Boot disk: Intel ProSSD 240GB on onboard SATA controller
LSI 9280 RAID controller + 24 SSD drives (RAID unconfigured at this time)

I've tried AHCI ("native" and "intel" modes) & IDE mode on the SATA controller without success.