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

[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 :)

Alex

> 
> Regards,
> Avik
>