> > Message: 1 > Date: Thu, 31 Jul 2008 06:43:29 -0700 > From: "Lombard, David N" <[EMAIL PROTECTED]> > Subject: Re: [Beowulf] reboot without passing through BIOS? > To: "Robert G. Brown" <[EMAIL PROTECTED]> > Cc: "Lombard, David N" <[EMAIL PROTECTED]>, > "beowulf@beowulf.org" <beowulf@beowulf.org>, David Mathog > <[EMAIL PROTECTED]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=us-ascii > > On Wed, Jul 30, 2008 at 11:27:22AM -0700, Robert G. Brown wrote: > > On Wed, 30 Jul 2008, David Mathog wrote: > > > > > David Lombard wrote: > > > > > >> On Wed, Jul 30, 2008 at 09:13:56AM -0700, David Mathog wrote: > > >>> It then occurred to me that doing so would > > >>> require a trip through the BIOS on every reboot, at least on every x86 > > >>> based computer I'm familiar with. > > >> > > >> Not since kexec was added to the kernel! > > > > > > That's exactly what I was thinking of for the Beowulf node problem. > > > For instance: > > > > > > http://www.knoppix.net/forum/viewtopic.php?t=27192 > > > > > >> Beyond using kexec as described above, grub directly supports this; lilo > > >> did too. > > > > > > I know how to do this by changing the configurations, but not how to > > > specify a one time change that doesn't need to be manually undone later. > > > Is either of these boot loaders capable of doing the logical equivalent > > > of: > > > > > > grub-next-boot-only -default 3 > > > > > > (Override whatever default is in the config file, but just for the next > > > boot.) > > > > There are several ways to accomplish this, and they can be automated. > > For example, run a script at boot time that runs a script like > > /etc/specialboot if it exists. Then put: > > > > #!/bin/sh > > > > # cp /boot/grub/grub.conf.default /boot/grub/grub.conf > > # cp /boot/grub/grub.conf.special /boot/grub/grub.conf > > According the the FM, there's a "grub-set-default" program that does > the trick. It supposedly creates a "default" file in the grub directory, > nominally /boot, that causes grub to behave differently. That's what I > was alluding to in my first post. Sadly, no such program exists in my F7. > > GIYF teaches us that the new method is: > > # echo "savedefault --default=2 --once" | grub --batch > # reboot > > where "2" is the choice for your next one-time boot. > > I haven't tried this; I did use the LILO method when it was the bootloader > of choice... > > --
>From KDE 3.5.x under OpenSUSE 10.x (and, presumably, 11.0) one can choose which bootloader option to reboot to when reboot is selected. Do the Windows requirements need 3-d graphics for the default booting? If not, would it be possible to boot into Linux and provide a virtual Windows environment? Or, setup the default boot to be Linux, then run a script* at Linux boot to set the one-time next boot be to Windows. This way, everytime Windows reboots Linux would start and every time Linux reboots Windows would start. * How to exactly implement such a script is beyond the scope of my current expertise, though I am more confident that this is possible, mayhaps even easily possible, than I am that quantum mechanics is a valid descriptor of the natural world. Having posted this I will be rather embarrassed if this is the thread that began as the non-ECC memory periodic refresh thread and not the Windows-by-day / Linux-by-night thread. Mark Kosmowski _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
