From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1751477AbcGNPMS (ORCPT <rfc822;w@1wt.eu>);
	Thu, 14 Jul 2016 11:12:18 -0400
Received: from mout.kundenserver.de ([217.72.192.75]:53735 "EHLO
	mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751074AbcGNPMQ (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Thu, 14 Jul 2016 11:12:16 -0400
From: Arnd Bergmann <arnd@arndb.de>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        "Liviu.Dudau@arm.com" <Liviu.Dudau@arm.com>,
        nofooter <nofooter@xilinx.com>,
        "thomas.petazzoni@free-electrons.com" 
	<thomas.petazzoni@free-electrons.com>
Subject: Re: Purpose of pci_remap_iospace
Date: Thu, 14 Jul 2016 17:12:01 +0200
Message-ID: <5073702.5KYvV2f0PW@wuerfel>
User-Agent: KMail/5.1.3 (Linux/4.4.0-28-generic; KDE/5.18.0; x86_64; ; )
In-Reply-To: <20160714145624.GB30657@red-moon>
References: <8520D5D51A55D047800579B094147198258B85DC@XAP-PVEXMBX01.xlnx.xilinx.com> <8520D5D51A55D047800579B094147198258B8F73@XAP-PVEXMBX01.xlnx.xilinx.com> <20160714145624.GB30657@red-moon>
MIME-Version: 1.0
Content-Transfer-Encoding: 7Bit
Content-Type: text/plain; charset="us-ascii"
X-Provags-ID: V03:K0:eBfs9wNVLUKLf0jl93/quy2MUk8vGXfMoJNUdWW+CnuJbZdVc5G
 xBP0mzaDFCgYfVpMBvBivbSgrPAIGor8CtvuXwWBTIO4JdQMdgfT0zWTiNvSWZ20H6Vvatr
 26PptH6GDjNulsyko/oo+dHPbrfkE5IXa8Uc0iBpp3BGW7q9MNAdb/j4M8YuircvaFx8Cn1
 qcdjThk8OYgk/FYOfyXsA==
X-UI-Out-Filterresults: notjunk:1;V01:K0:1Q40LBbgKtQ=:hJJI14yVh8TEQ9Ynm8MoP5
 5A1dn3/0wE5EnIhL9HXhZNXxgCElrSgoehLnhfLfG2nlOkRcGzCg4OSmagdz//xb9SA5imbE9
 xLtP0ex9U7ObYXhiQGo/maJPEvQxoK83zJY2kbyQsL7ctOStqb5qw8pOrHj3+o5OsoQA63T/y
 /26X4GbwS9CnpHi0LjsRf7Tma6t/RdHdkqpPQxsHqEO3iSeVf9TcMf3Z8ruMq2gYzKf8RikBX
 FhAGhwd1tHvgzVzhvt5nClgwRaOO1mrHL8+FE4kYyBDivjxKLk0fcc1saq1U6g2+d5/qjil4N
 efikty9v3JizP1btRq6jvS8hfMf8UqO6gg/wPyJJURNVLQdcMcmi/9zVh7JG42McL4lnliIis
 btXVsSxItBJtA4KzZQ6FM2mU0gKHGdUczZ82MXDX+J++KbwwjHM3i26trGbyl1XutCHTGPbqv
 Ov5t0z+f3uW0OjgIS39Z18jUylTLP6stXs+cLejD1dZE4vAjtdKPBkJlYb8gtm2iUuOd1kILF
 1P7E2kWMP5JDxXsI2SUwYxKk1nbcxDF2SsooP8mWBDlEhL4eMZJVt21K7vN2qOyfqS2uGBF8V
 HQMB18UJvKkO9r+5BrXdqXbcixPdmyLH5gU1orAy5p7vBSAYHmDbVyDcI4g//gycF+R7gQsIh
 ez2W5KGSi8lt3VPJap8TTFkv32mff66HvZF4Oog7O9EABsaVE+B7TWIpMdjZWqoz/B29VRHGF
 NUxKKBqlM9Y1hHrn
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thursday, July 14, 2016 3:56:24 PM CEST Lorenzo Pieralisi wrote:
> On Thu, Jul 14, 2016 at 01:32:13PM +0000, Bharat Kumar Gogada wrote:
> 
> [...]
> 
> > Hi Lorenzo,
> > 
> > I missed something in my device tree now I corrected it.
> > 
> > ranges = <0x01000000 0x00000000 0xe0000000 0x00000000 0xe0000000 0 0x00010000   //io
> 
> You have not missed anything, you changed the PCI bus address at
> which your host bridge responds to IO space and it must match
> your configuration.

I'd always recommend mapping the I/O space to PCI address zero, but
evidently the hardware is not configured that way here.

	Arnd