Grub Error Collection [Part 8] [POST GRUB QUESTIONS HERE!]

apexofservice · n00b Joined: 06 Jan 2006 Posts: 48

okay so emerged pciutils and got the lspci command

i think i may have a problem there:

NeddySeagoon · Posted: Sat Mar 22, 2008 9:38 pm Post subject:

apexofservice,

Be first into the future, follow this post
Your drive will become /dev/sda, so you will need to change /etc/fstab and and the root=/dev/ in grub.conf.

Run genkernel with the --menuconfig option and set the kernel options as shown.
When you exit, genkernel will continue the build.

If you really want to use the old IDE kernel branch, you can but I can't find my link just now as I'm away from a Gentoo system. Google for

apexofservice · n00b Joined: 06 Jan 2006 Posts: 48

NeddySeagoon ,

thanks for all your help.

so i emerged genkernel and ran "genkernel --menuconfig all"

i made the modifications suggested in your post, the kernel compiled and modules seemed to compile successfully.

i then edited /etc/fstab and changed all instances of 'hd' for 'sd'.

i then edited /boot/grub/grub.conf and changed root=/dev/hda4 to root=/dev/sda4.

i rebooted and got the same error message as originally:

VFS: cannot open root device "sda4" or unknown-block(0,0)
Please append . . .
Kernel panic -- not syncing . . .

ideas?

i didn't find your specific guide for ich4 family chipsets, but i followed the instructions at https://forums.gentoo.org/viewtopic-p-4570091.html#4570091.

thanks/what's next?

-apexofservice

Fixed the link, the automatic link generator included the trailing punctuation in the link. -- desultory

SxN · Posted: Sun Mar 23, 2008 3:58 am Post subject:

apexofservice,

I noted that you are loading the splashimage from (hd0,0), yet you mention that (hd0,0) is Win, and (hd0,1) is /boot.

Do you actauly see your splash?

SxN

apexofservice · n00b Joined: 06 Jan 2006 Posts: 48

Yeah, I meant to mention that the splash image loads and grub can successfully start windows on hd(0,0).

Here's an exact cut and paste of the grub.conf as updated after NeddySeagoons' suggestions:

SxN · Posted: Sun Mar 23, 2008 5:06 am Post subject:

apexofservice,

While I'm not so advanced as NeddySeagoons, I do have a suggestion:
when grub starts, issue a "c" to get a command prompt, and try to run a "cat" on a file on your problematic drive, like this:

apexofservice · n00b Joined: 06 Jan 2006 Posts: 48

SxN,

Thanks for the idea.

I'm currently emerging kde within the chroot environment on the minimal cd--it's strange to have a working system which needs a Live CD to access.

I'll try your idea after this is done compiling.

Also, perhaps you're right that root should = /dev/sda1, although i thought i wanted to find my root directory where the main filesystem is stored at /dev/hda4 or possibly /dev/sda4.

The thing is that the liveCD uses hda series and seems to function well. After taking Neddy Seagoon's modifications the new kernel is ostensibly looking for the sda series. Although I admittedly don't know much about the differences between these two schemes and I may have mangled the configuration.

in a non-hd/sd biased fashion, my partition scheme is:

1: windows
2: linux-boot
3: linux-swap
4: linux-root

At this point, I'm considering two competing hypotheses for the cause of the problem, one is that I have somehow misconfigured, or forgotten a step in correctly installing grub, or assigning addresses to grub, ie, some sort of problem in grub sorting. The other is that grub may not be the problem, but perhaps i've build a kernel that is somehow unbootable?

Thanks for everyone's ideas. [s]johnbarisic, your comments are spam and should be removed from the forum. The website linked to has nothing to do with this forum.[/s]

NeddySeagoon · Posted: Sun Mar 23, 2008 9:09 am Post subject:

apexofservice,

It looks like you did everything correctly - it just dosnt work.

SxN · Posted: Sun Mar 23, 2008 8:18 pm Post subject:

My grub.conf looks similar, serving a similar partitioning scheme:

NeddySeagoon · Posted: Sun Mar 23, 2008 9:21 pm Post subject:

SxN

I guess your symbolic link

SxN · Posted: Mon Mar 24, 2008 2:39 am Post subject:

NeddySeagoon,

You're right. Creating the symlink and removing "boot" from the path solved my problem. You must be some sort of magician!

idebus=66 is for a Thinkpad T23. My understanding is that this bus works at 66MHz. Am I wrong?

And, if I can abuse a bit more your time, what's the logic behind the /boot symlink?

Thanks for your help,
SxN

sekinto · n00b Joined: 24 Mar 2008 Posts: 5

So I finished installing Gentoo but for some reason when I try to boot I get a message about something not being able to be mounted, and then I get a kernel panic. It said to change the root= option in the GRUB configuration file, but I have it set to the right partition.
root=/dev/sda3

And here is my partition layout:
/dev/sda1 swap swap
/dev/sda2 ext3 /home
/dev/sda3 ext3 /

apexofservice · n00b Joined: 06 Jan 2006 Posts: 48

Neddy Seagoons,

You were right that I hadn't used the correct kernel name.

I'm booted in! Hooray.

Now I just have to get the wifi going, compile gnome,

-apexofservice

thanks again

NeddySeagoon · Posted: Mon Mar 24, 2008 10:32 am Post subject:

SxN,

The

SxN · Posted: Mon Mar 24, 2008 3:19 pm Post subject:

NeddySeagoon,

I did the experiment you suggested and I found no difference between the default 33 MHz and the forcing of 66MHz. I suppose that my idebus=66 is simply igonred. I took it out.

Thanks again,
SxN

gm7uac · n00b Joined: 17 Apr 2004 Posts: 57 Location: Glasgow

Hi, having problems with grub myself :-(

this is a new install and the system loads the splash screen and drops to the grub command prompt.

Only way to boot from this point is to type kernel /boot/bzImage (return) then type boot (return)

grub-install /dev/sda installs without any errors, kernel is complied without the older IDE driver support.

grub.conf below.

default 0

timeout 15

splashimage=(hd0,0)/boot/grub/splash.xpm.gz

root(hd0,0)

kernel /boot/bzImage root=/dev/sda1

any Ideas welcome .
_________________
If all else fails RTFM.

SxN · Posted: Mon Mar 24, 2008 9:13 pm Post subject:

gm7uac,

try inserting a

gm7uac · n00b Joined: 17 Apr 2004 Posts: 57 Location: Glasgow

stardotstar

Grub gives an error 15 on attempting to boot from the configured menu. But when the same command sequence is entered at the grub command line the system boots fine!

All disks in AHCI mode; BIOS is latest; all disks detected properly on post. Tried every combo of boot order and using the JMicron pair or the ICH9...

Current configuration:

Disk 0: 80GB Seagate Barra, 3 Primary Partitions:

Disk 5: Panasonic BD Optical - boots the system rescue cd fine.

Using Grub - grub manual setup reports all good - the kernel is on /dev/sda1 which is mounted as /boot on /dev/sda3 as root...

The only alarm bells are:
When I run

desultory · Bodhisattva Joined: 04 Nov 2005 Posts: 9410

Merged the above post.

stardotstar · Posted: Thu Apr 03, 2008 4:06 am Post subject:

(Thank you desultory.)

I have fixed this by (I think) doing a make install on the kernel - previously I was just copying the bzImage over to /boot and perhaps grub is looking for more than just the kernel image - something to do with the scripts that are made with the new kernel and automatically put in /boot/grub??

Thank goodness!
_________________
]8P

Aphax · Tux's lil' helper Joined: 16 Jan 2006 Posts: 75

Since yesterday, I am suddenly not able to boot Gentoo anymore. Grub comes up, starts the kernel, but then I get:

NeddySeagoon · Posted: Sat Apr 05, 2008 10:11 am Post subject:

Aphax,

Aphax · Tux's lil' helper Joined: 16 Jan 2006 Posts: 75