[coreboot] Intel Firmware Descriptor

[Andy Pont]

Hello,

I’m working on porting Coreboot to a laptop that uses Intel Comet Lake.  
When the build completes it spits out the following warning:

** WARNING **
coreboot has been built without an Intel Firmware Descriptor.
Never write a complete coreboot.rom without an IFD to your
board's flash chip! You can use flashrom's IFD or layout
parameters to flash only to the BIOS region.

What is an IFD and how do I create one?

-Andy.