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Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device settin


From: Alexander Graf
Subject: Re: [Qemu-ppc] Qemu boot device precedence over nvram boot-device setting
Date: Thu, 27 Sep 2012 11:39:26 +0200

On 27.09.2012, at 11:35, Benjamin Herrenschmidt wrote:

> On Thu, 2012-09-27 at 11:33 +0200, Alexander Graf wrote:
>> 
>> I think the command line should override anything user specified. So
>> basically:
>> 
>>  * user defined -boot option (or bootindex magic from Gleb)
>>  * nvram
>>  * fallback to default
>> 
>>> Eventually we should try to implement some sort of interactive boot
>>> device selection in SLOF, such as SMS does on pseries, but that will
>>> take a bit of time.
> 
> Ok but that means we need a way to know that an explicit -boot argument
> was passed vs. the default built-in list. I don't think vl.c gives us
> that today, does it ?

If it doesn't, we add that logic :).

> 
>> That would be en par with the bootmenu on x86 :). Please check out how
>> x86 models these things. It could sure be interesting for pseries.
> 
> Hrm... might apply ... or not. If we can specific an explicit qdev on
> qemu command line, then it's going to be an interesting exercise to tell
> SLOF about it (PCI devices come to mind).

... which is the same problem x86 has to convert qdev devices to option rom 
magic numbers. Really, the problems are very similar :)


Alex




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