From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: Problems when using latest git tree to boot xen on
	OMAP5
Date: Wed, 9 Oct 2013 12:19:19 +0100
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To: Julien Grall <julien.grall@linaro.org>
Cc: Chen Baozi <baozich@gmail.com>, List Xen Developer <xen-devel@lists.xen.org>
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On Wed, 2013-10-09 at 12:15 +0100, Julien Grall wrote:
> On 10/09/2013 09:11 AM, Ian Campbell wrote:
> > Rather than whitelisting and mapping disabled devices through perhaps we
> > should implement them as read 0xf (or 0x0) and write ignore?
> 
> We can't assume that these values (0x0 or 0xf) won't affect dom0 behaviour.

0xff is what you would typically get back if there was no actual
hardware present.

> What about a new quirk to map all disabled device in dom0
> (PLATFORM_QUIRK_DOM0_MAP_DISABLED_DEVICE)?

Why is this not the default behaviour?