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From: Benjamin Herrenschmidt <benh@au1.ibm.com>
Date: Thu, 27 Sep 2012 19:35:49 +1000
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Subject: Re: [Qemu-devel] [Qemu-ppc] Qemu boot device precedence over nvram
 boot-device setting
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To: Alexander Graf <agraf@suse.de>
Cc: Gleb Natapov <gleb@redhat.com>, "qemu-ppc@nongnu.org List" <qemu-ppc@nongnu.org>, Avik Sil <aviksil@linux.vnet.ibm.com>, Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>, qemu-devel qemu-devel <qemu-devel@nongnu.org>

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 ?
 
> 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).

Cheers
Ben.