From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Maciej W. Rozycki" <macro-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>
Subject: Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit
 and 32-bit ports
Date: Fri, 6 Jun 2014 10:02:42 +0100 (BST)
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To: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Cc: Josh Triplett <josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>, Jann Horn <jann-XZ1E9jl8jIdeoWH0uzbU5w@public.gmane.org>, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>, Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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On Wed, 4 Jun 2014, H. Peter Anvin wrote:

> > Also IIRC PCI-PCI bridges only forward port I/O space accesses 
> > within the low 64kB.
> 
> Not true.

 It must have been an implementation-specific constraint then (e.g. 
DECchip 21050), it's been a while since I looked into it.  Thanks for 
straightening me out.

  Maciej