Re: [Xen-devel] [Xen-staging] [xen staging] ARM: parse separate DT properties for different commandlines

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 10/07/2013 01:44 PM, Ian Campbell wrote:
> On Mon, 2013-10-07 at 13:23 +0100, Julien Grall wrote:
>> On 10/01/2013 11:12 AM, Ian Campbell wrote:
>>> On Tue, 2013-10-01 at 10:56 +0100, Ian Campbell wrote:
>>>> On Thu, 2013-09-19 at 10:44 +0100, Julien Grall wrote:
>>>>>
>>>>> On 19 Sep 2013 09:29, "Andre Przywara" <andre.przywara@xxxxxxxxxx>
>>>>> wrote:
>>>>>>>
>>>>>>>> @@ -261,7 +261,12 @@ const char *device_tree_bootargs(const void
>>>>> *fdt)
>>>>>>>>       if ( node < 0 )
>>>>>>>>           return NULL;
>>>>>>>>
>>>>>>>> -    prop = fdt_get_property(fdt, node, "bootargs", NULL);
>>>>>>>> +    prop = fdt_get_property(fdt, node, "xen,xen-bootargs", NULL);
>>>>>>>> +    if ( prop == NULL )
>>>>>>>> +    {
>>>>>>>> +        if (fdt_get_property(fdt, node, "xen,dom0-bootargs",
>>>>> NULL))
>>>>>>>> +            prop = fdt_get_property(fdt, node, "bootargs", NULL);
>>>>>>>> +    }
>>>>>
>>>>> The logic seems wrong here, we returns bootargs only if the property
>>>>> "xen,dom0-bootargs" exists. We should also check if the user give the
>>>>> dom0
>>>>> command line via the multiboot module.
>>>>
>>>> Anyone investigating this? I've just been using the following, which is
>>>> obviously bogus!
>>>
>>> How about this:
>>> 8<------------------------------------
>>>
>>> From a158dee49bb59e76c0f9103f512bb4bf9489f770 Mon Sep 17 00:00:00 2001
>>> From: Ian Campbell <ijc@xxxxxxxxxxxxxx>
>>> Date: Fri, 20 Sep 2013 23:45:34 +0100
>>> Subject: [PATCH] xen: arm: fix usage of bootargs for Xen.
>>>
>>> The chosen node's bootargs property should be used for Xen if there is a 
>>> dom0
>>> kernel multiboot module with a command line, not just if xen,dom0-bootargs 
>>> is
>>> present.
>>
>> From docs/misc/arm/device-tree/booting.txt:
>> If no Xen specific properties are present, bootargs is for Dom0.
>>
>> The current behaviour seems logic. Can you update the documentation?
> 
> You mean the patch is good but the docs need updating? Sure.

Yes.

-- 
Julien Grall

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