[meta-xilinx] Linux kernel differences between met-xilinx and kernel.org?

[Ralf Spiwoks]

Hello!

I am using Yocto and meta-xilinx to build the Linux kernel 4.9 for
a Zynq XC7Z030. Now, in my organization some people said that:

"Xilinx currently runs a custom Linux distribution which ... has patches
to the kernel by Xilink which are not accepted yet in the upstream Linux
kernel."

So, my question is:
What are the differences of the Xilinx Linux kernel w.r.t. to the Linux kernel
(from kernel.org)?

With my best regards,

Ralf Spiwoks, CERN