Advantech PCA-6186 User Manual

Select Yes if you are using a plug and play capable operating system.   
Select No if you need the BIOS to configure non-boot device

Default is Disable.  Select Enable to reset Extended System Configura-
tion Data (ESCD) if you have installed a new add-on and system econfig-
uration has caused such a conflict that OS cannot boot.

The commands here are “Auto” or “Manual.” Choosing “manual” 
requires you to choose resources from each following sub-menu. “Auto” 
automatically configures all of the boot and Plug and Play devices but 
you must be using Windows 95 or above.

This is left at “Disabled.”