5F40h – Config ID Hook

This function is known as “Boot Panel Type Hook” in the Desktop and Mobile Video BIOS. It allows the system BIOS to supply a configuration ID that will eventually be passed to the driver. This configuration ID is unused by the Video BIOS; however, it alters the behavior of the driver as described in Generating the Video Firmware.

Calling Registers:

AX = 5F40h, Config ID Hook

Return Registers:

AX = Return Status (function not supported if AL != 5Fh):

= 005Fh, Function supported and successful

= 015Fh, Function supported but failed

CL = Configuration ID