Yes, i915 driver loads a few different kind of firmware files (DMC, GuC and HuC in addition to CSR, VBT and GVT-d stuff). Here the firmware in question is the second one, GuC, and I thought this should have been loaded / enabled automatically for CFL. Currently GuC for CFL is identical as for KBL. What shows /sys/module/i915/parameters/enable_guc if you don't pass the value -1? After loading the driver, it'll be set to either 0, 1 or 2.