[U-Boot] Is there any full story about how to take advantage FDT function ?

And how to configure the kernel to minimize the code modification ?

I am porting U-Boot and Linux to a new board with a MPC875 processor and two serial chips, and U-Boot runs well now. I hear that the FDT function can tell the kernel devices information more flexibly and reduce the code modification indirectly.

But I didn't find enough materials to make my head clear, so any tip is greatly appreciated.

Thanks.