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Re: linux kernel boot parameters for just one menu item

From: s harding
Subject: Re: linux kernel boot parameters for just one menu item
Date: Thu, 29 Sep 2011 17:42:44 +0100 (BST)

OK. I managed to work it out (eventually).

I had somehow managed to get a non-ascii character in the '40_custom' based 
file in its parameters. This screwed up the planet.

The correct way to pass parameters to the kernel via grub2 for a specific menu 
item only IS to append them to the 'linux /boot/linux'... line.  Sorted.

Unrelated Grub2 observation 1:
I also needed to be extra careful that none of grub2's '*_LINUX' directives 
clash. They kept silently adding 'quiet' which confused an idiot. Humpth.. 
seems odd.. *GFX*_LINUX options not showing up in /proc/cmdline, yet seem to 
have an effect. Wonder why that is?  Oh-well, doesn't matter a jot to me.

Unrelated Grub2 observation 2:
I found vbeinfo to be completely unusable. On my mobo (with an i3 APU) the 
output was very long. The entries at the end of the list (the only ones I could 
see) were the least useful. I was too stupid to work out how to scroll back or 
to use a 'pager'. Nothing 'obvious' worked. Perhaps more people will have this 
problem in the future.

Thanks for listening!

> OK. I give up. I need help.
> How do I append an item to the linux kernel boot parameters
> for *just*one* menu item in GRUB2?  I want to have two
> linux menu items. Same partition, same kernel, just with
> different kernel command lines.
> GRUB_CMDLINE_LINUX doesn't help me since it applies to all
> standard linux menu lines.
> I have created a new custom menu item based on 40_custom.
> Text appended to its 'linux /boot/linux'... line does not
> seem to get through.
> The option I am trying to pass is
> 'init=/sbin/special_init'. I want to run a non-default init
> while retaining the ability to revert to the standard one. I
> am obviously being stupid, but I just can't see how.

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