[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: UEFI. Running grub only once functionality

From: Pádraig Brady
Subject: Re: UEFI. Running grub only once functionality
Date: Wed, 03 Feb 2010 13:15:45 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100111 Thunderbird/3.0.1

On 03/02/10 10:04, George Buranov wrote:
Hello everybody.
I got situation: I need to load linux kernel from grub, that can easily
fail on some computers (even in production). I use grub to load this and
the only this kernel.

So, what I want to do is to load another OS loader, if grub (or more
specificly my kernel) fails.

I know that UEFI supports this functionality (BootNext variable, UEFI
Spec 3.1.2)
"The boot manager is also required to initiate a boot of the boot option
specified by the BootNext variable as the first boot option on the next
boot, and only on the next boot. The boot manager removes the BootNext
variable before transferring control to the BootNext boot option"

If the grub can modify BootNext, if would be just ideal!

I also read, that grub has internal support for booting-once only

But it is not really clear how does it check if the kernel fails - my
kernel just hangs or reboot the OS??? So, this option does not seem too
secure. I need 100% garanty that the GRUB will try to load only once,
and after that it will pass the loading to another OS

I implemented/fixed up the boot once support in redhat's grub 1.
How I used it was to set a flag which was cleared when fully booted up.
This was all protected with a hardware watchdog which I started in
grub's stage 1 (though often you can get them started by the BIOS).


reply via email to

[Prev in Thread] Current Thread [Next in Thread]