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Re: [Xen-devel] [PATCH v3 09/10] xen: arm: update multiboot device tree bindings.

On Mon, 2014-07-21 at 12:53 +0100, Julien Grall wrote:
> On 07/21/2014 12:45 PM, Ian Campbell wrote:
> > On Fri, 2014-07-18 at 22:03 +0100, Julien Grall wrote:
> >> Hi Ian,
> >>
> >> On 18/07/14 14:08, Ian Campbell wrote:
> >>> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> >>
> >> Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
> > 
> > Thanks. I've applied patches 1..9 of this series. I'll resend 10 ASAP
> > with the change you've suggested.
> > 
> > On my potential backports list I've got:
> > xen: arm: implement generic multiboot compatibility strings
> > xen: arm: /chosen/module@N/bootargs bootprotcol node is not deprecated
> > 
> > I don't think anything else here is suitable for backport. Let me know
> > if you think something is (or isn't)
> I would also update the document bindings in
> docs/misc/arm/device-tree/booting.txt.
> The patch #9 looks the good one for this purpose. Minus the unspecified
> type example.

I think it is acceptable to point people to the latest version of the
doc in the dev branch as the canonical copy.

The latest version already needs to properly describe the mechanisms for
backwards compatibility anyway and trying to backport only the docs
updates which match backported bits of code is liable to get fiddly
quite fast and/or require new patches etc, I'd rather not do this.

> BTW, I don't find anything in the documentation talking about bootmodule
> type detection by ordering. Is this intended?

No, I should have done this and forgot, thanks for the reminder. See



From f9e80ead57b9f739c3041fe5abc4b23c8f0eb18f Mon Sep 17 00:00:00 2001
From: Ian Campbell <ian.campbell@xxxxxxxxxx>
Date: Mon, 21 Jul 2014 13:16:31 +0100
Subject: [PATCH] xen: arm: document boot module compatibility based on

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
 docs/misc/arm/device-tree/booting.txt |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/docs/misc/arm/device-tree/booting.txt 
index d967061..ad98bf3 100644
--- a/docs/misc/arm/device-tree/booting.txt
+++ b/docs/misc/arm/device-tree/booting.txt
@@ -23,7 +23,13 @@ Each node contains the following properties:
        compatible string (if one applies) in addition to the generic
        string (which must always be present).
-        Xen 4.4 supported a different set of legacy compatible strings
+       Xen will assume that the first module which lacks a more
+       specific compatible string is a "multiboot,kernel" and that
+       the second such is a "multiboot,ramdisk". Any subsequent
+       modules which lack a specific compatiblity string will not
+       receive any special treatment.
+       Xen 4.4 supported a different set of legacy compatible strings
        which remain supported such that systems supporting both 4.4
        and later can use a single DTB.

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