[NTLUG:Discuss] Boot Loader

[terry]

terry wrote:

> If  you look at the file:
> /etc/grub.conf
> you'll see the instructions that are  used to write grub bootloader to 
> the mbr of whatever drive you wanna write it to.

Wrong.
I must correct myself.
I didn't word that opening sentence correctly.  It should say:
----
If  you look at the file,
 /etc/grub.conf
you'll see the instructions used by grub for booting what ever OSs you 
have on your system.

>
> Yours apparently looks like this: (quoted from your earlier post):
> ---
> splashimage=(hd1,0)/grub/splash.xpm.gz
>
> title DELL-DIAG
>        rootnoverify (hd0,0)
>        chainloader +1
> title WIN-XP
>        rootnoverify (hd0,1)
>        chainloader +1
> title CURRENT_LINUX
>        root (hd1,0)
>        kernel /vmlinuz-2.4.20-8 root=/dev/hdb2 ro
> ---
>
> Let's look at it line by line.  The first line grabs the splash screen 
> from the second drive, hdb ( or d: )
>
> splashimage=(hd1,0)/grub/splash.xpm.gz
>
> hd1,0 in grub lingo translates to "second drive, first partition"
> If it said hd0,0  that would translate to "first drive, first partition"
> and the splash image you'll find right where it says, /grub/splash.xpm.gz
> (seeing the .gz on the end of it indicates that it's a gzip file, that 
> it's compressed but will be automatically uncompressed when needed.)
>
> The second section points to some sort of diagnosis  thing: ---
> title DELL-DIAG
>        rootnoverify (hd0,0)
>        chainloader +1
> ---
> the words after title, will be displayed in the appropriate place in 
> the splash screen, "DELL-DIAG"
> and it's located in the fist partition of the first drive on the first 
> ide port.
> chainloader +1 is just method of loading, or at least that's as close 
> as I can come to explaining that one, (someone else will have to chime 
> in on that one if you want more info cuz that's where my intelligence 
> ends, at chainloaders)
>
> Now for the MS Windows-XP part:
> ---
> title WIN-XP
>        rootnoverify (hd0,1)
>        chainloader +1
> ---
> Now we get to MS Windows-XP, which is correctly shown to reside in the 
> second partition of the first drive.  And "chainloader +1"  should be 
> the proper command to boot it.  ( It looks okay to me.)
>
> Now for the linux part:
> ---
> title CURRENT_LINUX
>        root (hd1,0)
>        kernel /vmlinuz-2.4.20-8 root=/dev/hdb2 ro
> ---
> You could shorten the title to just LINUX if you want, but as it 
> stands CURRENT_LINUX will show up in the splash screen.  It's showing 
> root to be in the first partition of the second drive.  It goes on to 
> give the name of the kernel (vmlinuz-2.4.20-8) and location, 
> /dev/hdb2, (second partition of the second drive).  ro = write only, 
> (it'll boot it as write only file system).
>
> It all looks okay to me.
>
> ---
> For comparison sake, look at mine:
> ---
> default=0
> timeout=10
> splashimage=(hd0,1)/grub/splash.xpm.gz
> title Red Hat Linux (2.4.20-8)
>        root (hd0,1)
>        kernel /vmlinuz-2.4.20-8 ro root=LABEL=/
>        initrd /initrd-2.4.20-8.img
> title DOS
>        rootnoverify (hd0,0)
>        chainloader +1
> ---
> default=0 means that the first entry is default.
> timeout=10 means that it'll give me 10 seconds to choose.
>
> You see that my "Red Hat Linux" resides at hd0,1  ( second partition 
> on first hard drive )
> Next you see that "DOS" is located on the first partition of the first 
> hard drive.  ---
>
> By now, you should have a pretty good handle on the situation, right?
> Got it?
>
>


-- 
Registered Linux User #188099
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