From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:32890) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Rjf3Z-0003lt-K7 for qemu-devel@nongnu.org; Sat, 07 Jan 2012 17:48:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Rjf3Y-0003a7-G4 for qemu-devel@nongnu.org; Sat, 07 Jan 2012 17:48:09 -0500 Received: from chello084112167138.7.11.vie.surfer.at ([84.112.167.138]:50755 helo=wiesinger.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Rjf3X-0003a1-TX for qemu-devel@nongnu.org; Sat, 07 Jan 2012 17:48:08 -0500 Date: Sat, 7 Jan 2012 23:47:29 +0100 (CET) From: Gerhard Wiesinger In-Reply-To: <20120107162844.GB8762@morn.localdomain> Message-ID: References: <4F055827.50202@redhat.com> <20120105083239.GR2072@redhat.com> <20120105092037.GA31206@redhat.com> <20120106020539.GB25140@morn.localdomain> <20120106052725.GA3105@redhat.com> <20120107015302.GA10181@morn.localdomain> <20120107162844.GB8762@morn.localdomain> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Subject: Re: [Qemu-devel] Boot order problem and disable iPXE/gPXE List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Kevin O'Connor Cc: Gerd Hoffmann , Gleb Natapov , qemu-devel@nongnu.org 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 -- http://www.wiesinger.com/