It is above 0x100 (PCI-Express extended register space), so if mmconf
is not enable, we can't access it.

[ hpa: changed the bound from 0x200 to 0x120, which is the tight
  bound. ]
Reported-by: NJens Axboe <jens.axboe@oracle.com>
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
LKML-Reference: <1261525263-13763-3-git-send-email-yinghai@kernel.org>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

For intel systems with multi IOH, we should read peer root resources
directly from PCI config space, and don't trust _CRS.
Signed-off-by: NYinghai Lu <yinghai.lu@sun.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>