From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: can't detect 16550A at port 0x010 on Vortex86dx board
Date: Fri, 6 Jul 2012 23:54:59 +0100
Message-ID: <20120706235459.5886e2ee@pyramind.ukuu.org.uk>
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To: Aras Vaichas <aras.vaichas@gmail.com>
Cc: linux-serial@vger.kernel.org

> Would Linux block my ability to manually probe these i/o ports?

Not beyond reserving the region which you've said you've covered.

What you may want to try is making sure Linux doesn't program the DMA
controller (in case its doing something which disables the port in poking
at it).

Beyond that I guess ask the manufacturer for info.

Alan