From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: Xen on ARM DT based boot protocol
Date: Thu, 23 May 2013 15:07:00 +0100
Message-ID: <519E2284.9050604@citrix.com>
References: <alpine.DEB.2.02.1305231335000.4799@kaball.uk.xensource.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <alpine.DEB.2.02.1305231335000.4799@kaball.uk.xensource.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: george.dunlap@eu.citrix.com, xen-devel@lists.xensource.com, andre.przywara@calxeda.com, Ian Campbell <Ian.Campbell@citrix.com>
List-Id: xen-devel@lists.xenproject.org

On 23/05/13 13:39, Stefano Stabellini wrote:
> Hi Ian,
> Andre was pointing out to me today that the current boot protocol has a
> problem:
> 
> 
> chosen {
>               bootargs = "dom0_mem=128M console=com1,vga";
>               xen,dom0-bootargs = "earlyprintk=xenboot console=ttyAMA1 root=/dev/mmcblk0 debug rw init=/bin/bash";
> };
> 
> 
> because we are using bootargs for Xen arguments, the bootloader cannot
> just pass the same two lines to Xen on ARM and to Linux on ARM.

I think it is unlikely the command line arguments for Linux are the same
for bare metal and dom0.  Even in this example here you have a
Xen-specific option (earlyprintk=xenboot).

> It would make their life easier if we had instead:
> 
> 
> chosen {
>               xen,xen-bootarg = "dom0_mem=128M console=com1,vga";
>               bootargs = "earlyprintk=xenboot console=ttyAMA1 root=/dev/mmcblk0 debug rw init=/bin/bash";
> };

David