Re: [Qemu-devel] Boot order problem and disable iPXE/gPXE

[Gerhard Wiesinger <lists@wiesinger.com>]

On Sat, 7 Jan 2012, Kevin O'Connor wrote:

> On Sat, Jan 07, 2012 at 10:00:56AM +0100, Gerhard Wiesinger wrote:
>> On Fri, 6 Jan 2012, Kevin O'Connor wrote:
>>> I'm not sure what a SCSI rom would do with a CD drive.  My guess is
>>> that it wouldn't map it to a BIOS visible drive id at all, as there's
>>> no way to select an id with any assurance that it wont conflict with
>>> one chosen by the BIOS or another rom.  If QEMU can simulate this (and
>>> someone knows the command-line to do such) it would be an interesting
>>> test to see what the rom does.
>>
>> As far as I remember from SCSI only systems one can just boot from
>> CD drives, too. Order is SCSI id (starting with SCSI id 0, up to 7,
>> 15, etc. depending on host adapeter).
>>
>> Tried:
>> -drive file=KNOPPIX_V6.2CD-2009-11-18-DE.iso,media=cdrom,if=scsi,bus=0,unit=0
>> all other drives are afterwards.
>>
>> Registers as CDROM, selecting Legacy Option ROM from boot menu, but
>> can't boot:
>> Screen:
>> Booting from DVD/CD...
>
> This is SeaBIOS attempting to boot from its internal CD code which
> wont work for SCSI.  (The "Legacy Option ROM" seletion is probably the
> KVM vapic.bin rom.)  The question is, what will the 8xx_64.rom do with
> a cdrom on a scsi adapter...
>
> I downloaded 8xx_64.rom and tried the above command line.
> Interestingly, it will register a BEV for a CD drive - which confirms
> my suspicion that it wont use a BCV.  Also interesting is that if both
> a harddrive and a CD are found, both a BEV and a BCV will be present -
> SeaBIOS doesn't support this, but I don't see any reason it couldn't.

Any plans to implement it?

BTW: Where is the "Spec" about BEVs and BCVs?

Thnx.

Ciao,
Gerhard

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