x86 FDT and bootloader

Hi list,

I am very new to device trees and have some questions. I am working on an
embedded x86 device, which has some extra chips connected to an i2c bus.
As it is not possible to probe for these devices - no ID register etc
- I am looking
into DT/FDT.
How is it possible to pass the FDT to the linux kernel via grub? How far is FDT
support for x86?

Thanks
--
Christian Gmeiner, MSc