Re: grub fallback mechanism

On Thu, 29 Dec 2005 01:12:35 +0100, Colin Ingram <synergymus@xxxxxxxxx> wrote:

I'm trying to test a new kernel remotely so I would like to use grub's
fallback mechanism.  I was wondering what is the difference between
doing using a config like this one taking from grub manual

     default saved
     timeout 10
     fallback 1

     title A
     root (hd0,0)
     kernel /kernel
     savedefault fallback

     title B
     root (hd1,0)
     kernel /kernel
     savedefault fallback

or just this one

     default 0
     timeout 10
     fallback 1

     title A
     root (hd0,0)
     kernel /kernel

     title B
     root (hd1,0)
     kernel /kernel

are these two configuration functionally different.  Thanks for your
help.


With the former, whichever was booted last is booted again, but if that
fails, the other is tried. If that works, since then the other is booted
each time, until one day it fails, and the first is again tried.

Disclaimer: I have not tried it, and I don't know if my interpretation
of the manual is correct.

I believe that the failure that Grub can catch and act upon is a failure
to find the named kernel file or load it. Once loaded, if the kernel
fails, I don't think the kernel has any way of giving control back to
Grub.

-Enrique
.

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