When does mach-types get updated in a tree?

I am trying to get a branch ready that could be pulled from with my new
patches.

There is a new Xilinx entry when I look at the
http://www.arm.linux.org.uk/developer/machines/download.php.

But I don't see a Xilinx entry anywhere in any git trees.

Maybe I overlooked it, or don't really understand the process (more than
likely).

Thanks,
John

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