Re: [Qemu-ppc] [Qemu-devel] [PATCH] Add nvram to default boot device list

[Andreas Färber]

Am 16.10.2012 10:04, schrieb Alexander Graf:
> 
> 
> On 16.10.2012, at 05:44, Avik Sil <address@hidden> wrote:
> 
>> On 10/12/2012 05:33 AM, Alexander Graf wrote:
>>>
>>> On 12.10.2012, at 00:59, David Gibson wrote:
>>>
>>>> On Thu, Oct 11, 2012 at 07:34:42AM +0530, Avik Sil wrote:
>>>>> This patch adds nvram specified boot device into qemu default
>>>>> boot_devices list. This helps firmware to boot from nvram specified
>>>>> boot device if no -boot option is specified.
>>>>
>>>> I really don't think this is a good idea, it extends an already
>>>> deprecated mechanism in a fuzzy way and requires careful checking to
>>>> see if it could break anything.  On all platforms the boot sequence
>>>> should be:
>>>>    if bootindex is specified:
>>>>        boot according to bootindex
>>>>    else if -boot is specified:
>>>>        boot according to -boot sequence
>>>>    else:
>>>>        use platform firmware default sequence
>>>>
>>>> The last will of course vary by platform, and could depend on platform
>>>> details like the contents of NVRAM.  Your original idea of making it
>>>> clear to the guest when -boot has been specified (as opposed to when
>>>> it contains its default value) was the right one, and this "x" in
>>>> -boot is going the wrong direction.
>>>
>>> Given that this is a fundamental direction for a bunch of machines, how 
>>> about we talk about it on the weekly QEMU call?
>>>
>> Was there any discussion on this in the last QEMU call?
> 
> The call is today :)

...and the topic is not officially on the agenda yet. :)

Andreas

-- 
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg