[Tfug] grub question

[Joel Howard]

OK I'm back --yes I'm running Debian though sometimes it runs me...
Matt - My original test (changing 512MB RAM to 256MB) was only to see if 
the boot parameter actually "took" when I booted.  Apparently not...
I started with Mr. Hooper's suggestion (and thanks) pointing me to 
/proc/cmdline -- the only thing there was root=/dev/hda9 ro.  None of my 
boot parameters seem to be making it, so I started from scratch by 
running update-grub and generating a new grub menu.lst, left the 
automagic section alone (it detected my kernels OK), and edited in the 
boot stuff which is not in the automagic section (from original question):

# altoptions=nmi_watchdog=1
# altoptions=mem=512MB
# altoptions=mem=nopentium
 
(syntax correct?)
Then I rebooted and went back to /proc/cmdline.  It remained unchanged.  
Maybe I should be using that copt xyz thing?
Joel H.



Matthew Eskes wrote:

> John,
> Ah, wasnt not aware of that. I have never had to use any of those 
> commands in automagic. *shrug*
> ----- Original Message ----- From: "John Gruenenfelder" 
> <johng at as.arizona.edu>
> To: "Tucson Free Unix Group" <tfug at tfug.org>
> Sent: Wednesday, June 15, 2005 4:11 PM
> Subject: Re: [Tfug] grub question
>
>
>> On Wed, Jun 15, 2005 at 04:06:22PM -0700, Matthew Eskes wrote:
>>
>>> Actually, thats not quite the right thinking...
>>> The GRUB config file is parsed like any other confile file in Linux,
>>> meaning that if there is is a hash mark there, it is ignored. For those
>>> options to take effect, you still need to uncomment them. This leads 
>>> me to
>>> somewhat of any odd question, if you have a half gig of RAM, why are 
>>> you
>>> wanting to use only a quarter gig? Anyway, even if it is in 
>>> "automagic", if
>>> you need to make a change, you still need to uncomment them, iirc.
>>>
>>> Matt
>>
>>
>> Actually, though he did not specifically state it, I believe Joel is 
>> using
>> Debian.  In the Debian GRUB config file, there are "automagic" 
>> sections where
>> you can set parameters for all GRUB menu items to use.  These are hidden
>> behind hash marks because they are not valid GRUB lines.
>>
>> Which brings me to a point for Joel:
>>
>> Though you don't need to run any program to make GRUB itself use the 
>> new file,
>> if you change the automagic sections, you must run update-grub in 
>> order for
>> the changes to take effect.  Have you done this?
>>
>>
>> -- 
>> --John Gruenenfelder    Research Assistant, Steward Observatory, U of 
>> Arizona
>>                        johng at as.arizona.edu
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