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Date: Sat, 14 Apr 2001 01:16:02 +0200
From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Friedrich Steven E CONT CNIN <friedrich_s@crane.navy.mil>
Cc: linux-kernel@vger.kernel.org
Subject: Re: device driver questions
Message-ID: <20010414011602.E2290@pcep-jamie.cern.ch>
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In-Reply-To: <AF6E1CA59D6AD1119C3A00A0C9893C9A04F57121@cninexchsrv01.crane.navy.mil>; from friedrich_s@crane.navy.mil on Fri, Apr 13, 2001 at 03:10:48PM -0500
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Friedrich Steven E CONT CNIN wrote:
> 	If you want to mmap the device then you really want to put the
> device in its own 4K aligned 4K sized PCI window, otherwise adjacent
> devices will become accessible too and that might not be desirable.

If you can, reprogram the device's PCI configuration to have a 4k or
more sized window.  (You said you were willing to move functionality
into the hardware, so I assume you can do this).  That guarantees it
will be page aligned, and without other devices overlapping in
userspace.

-- Jamie
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