[PATCH] booting-without-of: add Xilinx uart 16550.

[Stephen Neuendorffer]

> +       - reg-shift : registers offset shift (standard uart_port
field).
> +         Property is optional if regshift is zero.

I was hoping to get an idea of what is required here, or when I might
use it?

It looks like the ARCH=ppc code instantiates this with a reg-shift of
2...  Is this the expected value?  When would it be not zero? or not
two?

Steve