ADLINK cPCI-6870 - Manual (Page 101)

BIOS Setup Utility 87
cPCI-6870
South Bridge Configuration
You can use this screen to select options for the South Bridge
Configuration. Use the up and down < Arrow > keys to select an
item. Use the < Plus > and < Minus > keys to change the value of
the selected option.
HDA Controller
Set this value to Enable/Disable the HDA Controller.