From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anthony Liguori <anthony@codemonkey.ws>
Subject: Re: Failure to boot CDROM with -drive arg
Date: Tue, 08 Jul 2008 10:14:23 -0500
Message-ID: <4873844F.7040107@codemonkey.ws>
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Cc: "Daniel P. Berrange" <berrange@redhat.com>, kvm@vger.kernel.org
To: Laurent Vivier <Laurent.Vivier@bull.net>
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Laurent Vivier wrote:
> Le mardi 08 juillet 2008 =C3=A0 09:59 -0500, Anthony Liguori a =C3=A9=
crit :
>  =20
>> Laurent Vivier wrote:
>>    =20
>>> So, "boot=3Don" means in fact "bootable=3Dtrue"
>>>  =20
>>>      =20
>> I guess.  I don't know that the later is more clear.  I think the so=
urce=20
>> of the confusion is the entire concept of "first bootable harddisk"=20
>> which is what -boot c really means.
>>
>> FWIW, the reason media=3Dcdrom,boot=3Don doesn't work, is that a CDR=
OM's=20
>> boot record is in el torito format instead of the traditional BIOS b=
oot=20
>> sector.
>>
>> media=3Dcdrom,boot=3Don would work if the image was a disk image ins=
tead of=20
>> an ISO.
>>
>> In fact, I'm inclined to think that media=3Dcdrom,boot=3Don should n=
ot be=20
>> explicitly prohibited because of this fact.
>>    =20
>
> To simplify, I think qemu should ignore "boot=3Don" when "if=3Dide".
>  =20

It's necessary to boot from anything other than hda.  For instance:

qemu-system-x86_64 -hda foo.img -drive file=3Dboo.img,if=3Dide,boot=3Do=
n -boot c

Regards,

Anthony Liguori

> Laurent
>  =20