Patch Set 12:

I'm still curious why it needs to be one on some boards, even if the
HDA is disabled. For me it sounds like a bug that's triggered somehow.

I tried disabling HDA for my asrock board + I did not install VC1 (VC0 is installed by default in FSP):

--- a/src/mainboard/asrock/h110m/devicetree.cb
+++ b/src/mainboard/asrock/h110m/devicetree.cb
@@ -53,7 +53,7 @@ chip soc/intel/skylake
        register "Device4Enable" = "1"
        register "SaGv" = "SaGv_Enabled"
        register "PmTimerDisabled" = "0"
-       register "EnableAzalia" = "1"
+       register "EnableAzalia" = "0"

 
        register "pirqa_routing" = "PCH_IRQ11"
@@ -426,7 +426,7 @@ chip soc/intel/skylake
                end # LPC Interface
                device pci 1f.1 on  end # P2SB
                device pci 1f.2 on  end # Power Management Controller
-               device pci 1f.3 on  end # Intel HDA
+               device pci 1f.3 off end # Intel HDA
                device pci 1f.4 on  end # SMBus

        params->CdClock = 3;
-       /* Enable Virtual Channel 1 */
-       params->PchHdaVcType = 0x1;

The OS is loading, but there is no sound

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