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ChrisAbela
n00b
Joined: 28 Apr 2012
Posts: 5
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 Posted: Sat Apr 28, 2012 8:26 pm Post subject: GRUB always manages to find my kernel |
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This is my /boot/grub/grub.conf
| Quote: | default 0
timeout 30
title Gentoo
root (hd0,0)
kernel /boot/kernel root=/dev/sda3
title Gentoo2
root (hd0,0)
kernel /kernel root=/dev/sda3 |
My installation process was copied from http://www.gentoo.org/doc/en/gentoo-x86-quickinstall.xml wherein the the kernel is referred as /boot/kernel. However Grub looks in /dev/sda1 for the kernel where it should find it under as /kernel, so I wrote Gentoo2.
I successfully boot from both Gentoo and Gentoo2. I confirm that /boot in /dev/sda3 is empty unless /dev/sda1 is mounted. Why? |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 29970
Location: 56N 3W
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| Posted: Sat Apr 28, 2012 8:53 pm Post subject: |
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ChrisAbela,
Your system contains two places called /boot.
One is a directory on your root filesystem. This should always be empty as it used as a mount point to attach your boot partition when you want to install a new kernel.
Grub cannot use the filesystem tree to load the kernel, mostly because the filesystem tree doesn't exist until after the kernel is loaded and the init process is well underway.
If the kernel is loaded, grubs job is done.
| Code: | title Gentoo
root (hd0,0)
kernel /boot/kernel root=/dev/sda3 |
and
| Code: | title Gentoo2
root (hd0,0)
kernel /kernel root=/dev/sda3 |
both point to the same kernel file.
Its worth looking at the lines in your boot stanza.
The title line is use to populate the grub menu
The root (hd0,0) is grubspeak for where to find the files referenced further down the boot stanza. Thats the first partition on the first drive discovered by the BIOS. Normally /dev/sda1
The kernel line says to load a file called kernel in the top level of (hd0,0)
Indeed you can write | Code: | | kernel (hd0,0)/kernel ... |
if you wish and not have a root (hd0,0) at all.
The rest of the kernel line is passed to the kernel as a space separated list of paramters. Grub does nothing with them at all.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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Installing Gentoo
