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Tazmanian Apprentice
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Joined: 01 Jul 2003 Posts: 222
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Posted: Fri Jan 09, 2004 8:40 am Post subject: How to fix 'Kernel panic: VFS: Unable to mount root fs' |
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There have been much discussion on how to fix this. This summarizes some of the tips given so far in these discussions. Note that this error has nothing to do with /etc/fstab! If the kernel can't mount the root file system, then there's no way it can read /etc/fstab. This is purely a kernel configuration problem.
Fix your kernel boot parameters.
Make sure your kernel has a "root=" parameter passed to it in your bootloader and that the parameter points to your root file system. For example, my root file system is on /dev/hde2. My grub.conf contains:
Code: | kernel (hd0,0)/boot/bzImage-2.6.1-rc2-gentoo-1 root=/dev/hde2 |
If you use LILO, then your lilo.conf should contain something analogous to:
Code: | image=/boot/bzImage-2.6.1-rc2-gentoo-1
root=/dev/hde2 |
Remember to rerun lilo after editing lilo.conf!
If you don't know which partition is your root, then check /etc/fstab and look for the entry for / :
Code: | /dev/hde2 / reiserfs noatime 1 2 |
Ensure the proper options and drivers are built into the kernel.
Don't forget to mount /boot when installing a new kernel!
devfs support
You need devfs support built in and mounted at boot time. In the 2.6 kernel, these are listed as:
Code: | File systems
-> Pseudo file systems
-> /dev file system support (OBSOLETE) DEVFS_FS
-> Automatically mount at boot DEVFS_MOUNT |
In the 2.4 kernel, they are:
Code: | File systems
-> /dev file system support (EXPERIMENTAL)
Automatically mount at boot |
File system support
You need support for your root file system built in (not built as a module). My root file system is Reiser. So I have reiserfs built into my kernel. If you are unsure what your root file system is, check /etc/fstab.
Drive controller support
You need supoort for your drive controller built into the kernel. If you are unsure what to build, check with `lspci', part of the sys-apps/pciutils package. If all else fails, build them all and use the process of elimination.
IDE
Make sure you have support for your IDE chipset compiled in. In the 2.6 kernel, these can be found in
Code: | Device Drivers
-> ATA/ATAPI/MFM/RLL support
-> Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support
-> PCI IDE chipset support
-> Generic PCI bus-master DMA support |
For the 2.4 kernel, they are in
Code: | ATA/IDE/MFM/RLL support
-> IDE, ATA and ATAPI Block devices
-> Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support
-> Generic PCI IDE chipset support |
You also need "Include IDE/ATA-2 DISK support" built in. This can be found in the "Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support" branch of the kernel configuration menu.
SCSI
Make sure you have support for your SCSI device compiled in. In the 2.6 kernel,
Code: | Device drivers
-> SCSI device support
-> SCSI low-level drivers |
In the 2.4 kernel,
Code: | SCSI support
-> SCSI low-level drivers |
You also need "SCSI disk support" built in. This can be found in the "SCSI [device] support" branch of the kernel configuration menu.
Partition selection support
If you partitioned your drive under a different operating system, you may need to enable partition selection support in the kernel. In both the 2.4 and 2.6 kernels,
Code: | File systems
-> Partition types
-> Advanced partition selection |
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Tii l33t
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Joined: 02 Jan 2004 Posts: 733
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Posted: Fri Jan 09, 2004 8:52 am Post subject: Re: HOWTO fix 'Kernel panic: VFS: Unable to mount root fs' |
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That's a good list!
Tazmanian wrote: |
devfs support
You need devfs support built in and mounted at boot time. In the 2.6 kernel, these are listed as:
Code: | File systems
-> Pseudo file systems
-> /dev file system support (OBSOLETE) DEVFS_FS
-> Automatically mount at boot DEVFS_MOUNT |
In the 2.4 kernel, they are:
Code: | File systems
-> /dev file system support (EXPERIMENTAL)
Automatically mount at boot |
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However, I am using 2.6 kernel and don't have
Code: | -> Automatically mount at boot |
What do I need that for? |
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Tazmanian Apprentice
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Joined: 01 Jul 2003 Posts: 222
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Posted: Fri Jan 09, 2004 9:00 am Post subject: Re: HOWTO fix 'Kernel panic: VFS: Unable to mount root fs' |
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Derryth wrote: | That's a good list! |
Thanks!
Derryth wrote: | However, I am using 2.6 kernel and don't have
Code: | -> Automatically mount at boot |
What do I need that for? |
I'm not sure, but I'm guessing that if I have "root=/dev/hde2" as a boot parameter, then the kernel needs /dev mounted at boot time to translate "/dev/hde2" into the proper node address.
It's also part of the Gentoo installation guide (Sec. 7, Code listing 6). |
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Tii l33t
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Joined: 02 Jan 2004 Posts: 733
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Posted: Fri Jan 09, 2004 9:02 am Post subject: Re: HOWTO fix 'Kernel panic: VFS: Unable to mount root fs' |
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Tazmanian wrote: |
Derryth wrote: | However, I am using 2.6 kernel and don't have
Code: | -> Automatically mount at boot |
What do I need that for? |
I'm not sure, but I'm guessing that if I have "root=/dev/hde2" as a boot parameter, then the kernel needs /dev mounted at boot time to translate "/dev/hde2" into the proper node address.
It's also part of the Gentoo installation guide (Sec. 7, Code listing 6). |
I didn't even have devfs support at first because I though I didn't need it (it says it's obsolete in the setup). It worked just fine except every time at boot it would complain so I added that. |
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Cheesepie Apprentice
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Joined: 19 Jan 2004 Posts: 154
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Posted: Tue Jan 20, 2004 7:29 am Post subject: |
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I checked and triple checked all of the above solutions to the kernel panic problem, and Im still getting it.
I am absolutely sure that the filesystem and controller are compiled into the kernel.
Im using 2.6.1, btw.
any other ideas?
===============
Problem Solved: I replaced the SATA cable on the drive and it works now. The cable seems to work in another machine, so it must have been making a bad connection with the drive or something. |
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smellycheeseboy Apprentice
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Joined: 15 May 2003 Posts: 263 Location: The Future
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Posted: Tue Jan 20, 2004 9:15 am Post subject: |
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I also checked and triple-checked all the settings and they were all right and I am still getting this error.
Help would be greatly appreciated.
Me _________________ "No amount of fear can stop the rise of free media, or free software." --Jonathan Schwartz, Sun Microsystems |
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Corw|n of Amber Apprentice
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Joined: 08 Aug 2003 Posts: 221 Location: Socialist Sovietic Republic of Belgium
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Posted: Tue Jan 20, 2004 3:51 pm Post subject: |
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Remove the initrd line in your grub.conf should get rid of that error. It's a highly irritating genkernel bug (or maybe combination_of_reiserfs+2.6+grub bug).
I'm pretty sure that would cure your computer as it did mine... _________________ Whoever is enough of a fanatic to KILL people should be shot on sight. |
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smellycheeseboy Apprentice
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Posted: Tue Jan 20, 2004 9:04 pm Post subject: |
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I don't have an initrd line because I didn't use genkernel. However I found that adding a notail option to my root partition (which is reiserfs) fixed the problem.
Me _________________ "No amount of fear can stop the rise of free media, or free software." --Jonathan Schwartz, Sun Microsystems |
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Corw|n of Amber Apprentice
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Posted: Tue Jan 20, 2004 9:14 pm Post subject: |
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Oh. Yes. Forgot that one. Sorry ![Embarassed :oops:](images/smiles/icon_redface.gif) _________________ Whoever is enough of a fanatic to KILL people should be shot on sight. |
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smellycheeseboy Apprentice
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Joined: 15 May 2003 Posts: 263 Location: The Future
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Posted: Tue Jan 20, 2004 9:22 pm Post subject: |
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No prob. Thanks for the suggestions. _________________ "No amount of fear can stop the rise of free media, or free software." --Jonathan Schwartz, Sun Microsystems |
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secondshadow Guru
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Joined: 23 Jun 2003 Posts: 362
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Posted: Wed Jan 21, 2004 5:16 am Post subject: |
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Just to add my $0.02, the way I solved part of this problem was to use an experimental LiveCD (2.6) and pull its config from /proc/config.gz then strip out everything I didn't need. This fixed my problem and while its not the IDEAL solution, it works quite well. |
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timmy334 n00b
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Joined: 24 Sep 2003 Posts: 69 Location: Montgomery, AL
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Posted: Thu Jan 22, 2004 5:53 pm Post subject: IRQ scan failed |
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I've always gotten this kernel panic and I just saw that when it's booting it does an IRQ scan for all my drives, and when it gets to hda(my drive) the scan doesn't find anything. Any idea what is causing this specifically? _________________ It is by caffeine alone I set my mind in motion,
It is by the beans of Java my thoughts acquire speed,
My hands acquire shaking, the shaking becomes a warning,
It is by caffeine alone I set my mind in motion |
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allancairns Tux's lil' helper
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Joined: 18 Dec 2003 Posts: 80 Location: Perth, Western Australia
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Posted: Sun Jan 25, 2004 1:26 am Post subject: |
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Getting it here too on a 2.6.1 upgrade using genkernel.
I use reiserfs for my root (pattern?) but already have the notail option in fstab.
I double-checked my grub.conf for the root= and tried commenting out the initrd but no luck.
Any other ideas?
Thanks,
Allan |
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allancairns Tux's lil' helper
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Joined: 18 Dec 2003 Posts: 80 Location: Perth, Western Australia
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Posted: Sun Jan 25, 2004 1:12 pm Post subject: |
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allancairns wrote: | Getting it here too on a 2.6.1 upgrade using genkernel.
I use reiserfs for my root (pattern?) but already have the notail option in fstab.
I double-checked my grub.conf for the root= and tried commenting out the initrd but no luck.
Any other ideas?
Thanks,
Allan |
This thread https://forums.gentoo.org/viewtopic.php?p=805230 fixed mine. The syntax of grub for 2.6 is totally different from 2.4.
Cheers,
Allan |
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cchee Apprentice
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Posted: Sun Jan 25, 2004 9:26 pm Post subject: |
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Read the /usr/share/genkernel/README |
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Suicidal l33t
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Posted: Sun Jan 25, 2004 9:30 pm Post subject: |
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Quote: | The syntax of grub for 2.6 is totally different from 2.4. |
Actually the syntax for the new genkernel is different, It doesent have anything to do with the kernel. I have an old P1 box here that I do manually and the kernel line is still the same as 2.4 |
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allancairns Tux's lil' helper
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Joined: 18 Dec 2003 Posts: 80 Location: Perth, Western Australia
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Posted: Mon Jan 26, 2004 1:59 am Post subject: |
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Suicidal wrote: | Quote: | The syntax of grub for 2.6 is totally different from 2.4. |
Actually the syntax for the new genkernel is different, It doesent have anything to do with the kernel. I have an old P1 box here that I do manually and the kernel line is still the same as 2.4 |
I stand corrected ![Smile :)](images/smiles/icon_smile.gif) |
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wegewijs n00b
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Posted: Wed Feb 04, 2004 9:00 pm Post subject: Me too |
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Total n00b to Gentoo (not to linux)
Have the above problem also.
Kernel 2.6.1 gentoo-dev-sources
Stage1 install ofcourse
Checked al of the above ofcourse. No deal.
I have on-board RAID controller but not configured to use RAID at all.
Highpoint 370A or so... do I need to compile it into kernel also (didn't try yet cus' I cant find it in menuconfig).
SOLVED From this forum I guessed I left something out in the kernel. Indeed including the HPT37X drivers into the kernel solved the problem.
Time to start fooling around with this sooo cooool distro |
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boroshan l33t
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Joined: 16 Apr 2003 Posts: 730 Location: upside down
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Posted: Thu Feb 19, 2004 2:22 pm Post subject: still no luck! |
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Hi all.
I've been suffering from this problem on one of my machines. The other two, one boots but the pci-pcmcia bridge is not supported yet, and the other works fine with 2.6.
Anyway, I've been through this topic and the searched forum in some detail. I don't pretend I've been exaustive, but l've read a lot. Here's my setup:
root and boot partitions: Code: | /dev/hdb3 on / type reiserfs (rw,noatime,notail)
/dev/hdb2 on /boot type ext2 (rw,noatime) |
drive controller
Code: | frankie # lspci | grep -i ide
00:07.1 IDE interface: Intel Corp. 82371AB/EB/MB PIIX4 IDE (rev 01) |
selected grub.conf bits
Code: | frankie # mount /boot
frankie # cat /boot/grub/grub.conf
default 1
fallback 0
timeout 10
title=Gentoo, Baby!
root (hd0,1)
kernel /kernel-2.4.22-gentoo-r5 root=/dev/hdb3
title=Gentoo 2.6
root (hd0,1)
kernel /kernel-2.6.1-gentoo root=/dev/hdb3
title=Love Gentoo
root (hd0,1)
kernel /boot/kernel-2.6.3_rc2-love2 root=/dev/hdb3 |
Hmm... grub partitions are back to front, probably because I installed
grub on hdb. 2.4 boots ok like that. Could it be a problem under 2.6? I find myself oddly reluctant to fiddle with it in case I break the whole system. Dunno why, I've fixed worse problems...
Anyway, I compiled a checklist:
root line in grub.conf: partition is /dev/hdb3 which is correct
devfs built in? mount at boot?
Code: | [*] /dev file system support (OBSOLETE)
[*] Automatically mount at boot |
PC Partition supported:
Code: | [*] Advanced partition selection
[*] PC BIOS (MSDOS partition tables) support
[ ] Windows Logical Disk Manager (Dynamic Disk) support |
reiserfs (root partition) supported
Code: | <*> Reiserfs support
[ ] Enable reiserfs debug mode
[ ] Stats in /proc/fs/reiserfs |
ext2 (boot partition) supported
Code: | <*> Second extended fs support
[ ] Ext2 extended attributes |
drive controller built in?
Code: | <*> Intel PIIXn chipsets support |
Generic PCI bus-master DMA support
Code: | [*] Generic PCI bus-master DMA support |
Include IDE/ATA-2 DISK support
Code: | <*> Include IDE/ATA-2 DISK support
[*] Use multi-mode by default
[*] Auto-Geometry Resizing support |
boot partition mounted/kernel copied across/modules installed:
Code: | make menuconfig
make
make modules_install
mount /boot
cp arch/i386/boot/bzImage /boot/kernel-2.6.3_rc2-love2
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Additionally:
I tried the experimental 2.6 LiveCD to see if I could adapt the config from /proc. Sadly, it hangs during the boot process. About the last message printed has it mis-identifying something (probably my adsl modem) as a USB storage device, which might have a bearing...
I tried genkernel ut was put off by the bugs in some of the earlier betas (I read the stuff about real_root /ram0 and linuxinit, but since it didn't help I went back to hand compiling. So - no initrd in grub.conf and hopefully none needed.
The machine causing the problem is an old P266 - a gateway G6-266 in fact. It's my firewall box and I would like to keep it reasonably up to date. Any ideas would be appreciated.
[ edited to reflect some other things tried ] _________________ Don't let THEM immanentize the Eschaton!
Last edited by boroshan on Wed Apr 28, 2004 10:06 pm; edited 1 time in total |
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Epikuros n00b
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Joined: 19 Aug 2003 Posts: 56 Location: Helsinki, Finland
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Posted: Thu Feb 19, 2004 3:35 pm Post subject: |
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Well maybe I just post my version of the problem: IDE-hard-drive with hda1(ext3) as the bootable filesystem(/boot) and hda4(reiserfs) as the root(/).
I configured my 2.6-kernel(development sources) manually so no genkernel is involved . I did do
make menuconfig && make && make modules_install
mount /boot && copy arch/i386/boot/bzImage /boot/bzImage-2.6
2.4 boots up just fine but 2.6 ends in the kernel panic.
In kernel-config IDE-things are enabled as well as reiserfs and ext3.
The full configuration-files can be in the following addresses:
config-file for 2.4 kernel
config-file for 2.6 kernel
I have also tried hundred and one different combinations with no success yet
Here is the grub.conf:
#################
default 0
timeout 10
title=Gentoo Kernel
root (hd0,0)
kernel (hd0,0)/bzImage-2.4 root=/dev/hda4 video=vesafb vga=792 hdd=scsi
title=Development Kernel
root (hd0,0)
kernel (hd0,0)/bzImage-2.6 root=/dev/hda4
################# _________________ ---
Epikuros |
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irf2003 Veteran
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Joined: 10 Sep 2003 Posts: 1078
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Posted: Thu Feb 19, 2004 7:05 pm Post subject: |
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"Automatically mount at boot" should be disabled if
you are using genkernel
the relevant parts of lilo.conf file should look something like this (please substitute with your kernel image)
Code: |
image = /boot/kernel-2.6.3-gentoo
root = /dev/sda3
vga=0x31A
label = 2.6.3-gentoo
initrd=/boot/initrd-2.6.3-gentoo
append="root=/dev/ram0 real_root=/dev/sda3 init=linuxrc video=:vesa:ywrap,mtrr splash=verbose"
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HTH |
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Epikuros n00b
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Posted: Sat Feb 21, 2004 11:51 am Post subject: |
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I've decided to post a little more info. Maybe that helps to solve the problem.
I installed the latest kernel-versions. The .config-files can still be found here:
config for 2.4.22-gentoo-r7
config for 2.6.3
both of these configs have the following:
Second extended fs support
Reiserfs-support
Ext3 journalling file system support
/dev file system support
Inculde IDE/ATA-2 DISK support
PCI IDE chipset support
Generic PCI bus-master DMA support
etc(if you want to see more detailed info check the config-files or if you are too lazy just ask me)
Still only the 2.4.22 boots while 2.6.3 ends up in kernel panic.
this time I used 'make install' so the new grub.conf looks like this(nothing changed but the names):
#########
default 0
timeout 10
title=Gentoo Kernel
root (hd0,0)
kernel (hd0,0)/vmlinuz-2.4.22-gentoo-r7 root=/dev/hda4 video=vesafb vga=792 hdd=scsi
title=Development Kernel
root (hd0,0)
kernel (hd0,0)/vmlinuz-2.6.3 root=/dev/hda4 video=vesafb vga=792
#########
the fstab looks like this(some comments stripped off):
#########
/dev/hda1 /boot ext3 noauto,noatime 1 2
/dev/hda2 none swap sw 0 1
/dev/hda3 /usr reiserfs notail 0 0
/dev/hda4 / reiserfs notail 0 0
/dev/cdroms/cdrom0 /mnt/cdrom1 iso9660 user,noauto,ro 0 0
/dev/cdroms/cdrom1 /mnt/cdrom iso9660 user,noauto,ro 0 0
/dev/fd0 /mnt/floppy ext2 user,noauto 0 0
# NOTE: The next line is critical for boot!
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
#########
Hard-drive is a normal ide-drive with capacity of 60GB(afaik Caviar Series from Western Digital), motherboard is asus P3B-F. Hardware however shouldn't be the issue here as 2.4-kernel(as have different versions of Windows) has always booted just fine. _________________ ---
Epikuros |
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irf2003 Veteran
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Joined: 10 Sep 2003 Posts: 1078
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Posted: Sat Feb 21, 2004 8:56 pm Post subject: |
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Epikuros, I had a look at your 2.6.3 config files, and
here are my observations:-
loopback device & ram disk support should be enabled.
also set in initial ram disk of 8k
Code: |
Device Drivers --->
Block devices --->
<*> Loopback device support
<*> RAM disk support
[8192] Initial RAM disk (initrd) support
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you need to disable ATI Radeon display support,
you only need VESA VGA for the purposes of the
framebuffer.
Code: |
Device Drivers --->
Graphics support --->
[*] VESA VGA graphics support
<> ATI Radeon display support
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enble this to have a nice bootup screen.
Code: |
Device Drivers --->
Graphics support --->
Bootsplash configuration --->
[*] Bootup splash screen
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Automatically mount at boot should be off,
/dev/pts was off it should be on.
Code: |
File systems --->
Pseudo filesystems --->
[*] /dev file system support (OBSOLETE)
[] Automatically mount at boot
[*] /dev/pts file system for Unix98 PTYs (note this should be selectected)
[*] Virtual memory file system support (former shm fs)
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now assuming that you are using genkernel to compile your kernel
the "Development Kernel" part of your grub.conf file should look
something like this (you may need to change the image and initrd names):-
Code: |
title=Development Kernel
root (hd0,0)
kernel (hd0,0)/boot/vmlinuz-2.6.3 root=/dev/ram0 init=/linuxrc real_root=/dev/hda4 vga=0x317
initrd (hd0,0)/boot/initrd-2.6.3
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HTH |
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alexlm78 Veteran
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Posted: Sat Feb 21, 2004 9:04 pm Post subject: |
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Excelent !!!! ![Very Happy :D](images/smiles/icon_biggrin.gif) _________________ "This is a different kind of world, you need a different kind of software"
Linux User# 315201
100% Chapin hecho en Guatemala |
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Epikuros n00b
![n00b n00b](/images/ranks/rank_rect_0.gif)
Joined: 19 Aug 2003 Posts: 56 Location: Helsinki, Finland
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Posted: Sun Feb 22, 2004 9:12 am Post subject: |
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irf2003 wrote: |
now assuming that you are using genkernel to compile your kernel
the "Development Kernel" part of your grub.conf file should look
something like this (you may need to change the image and initrd names):-
Code: |
title=Development Kernel
root (hd0,0)
kernel (hd0,0)/boot/vmlinuz-2.6.3 root=/dev/ram0 init=/linuxrc real_root=/dev/hda4 vga=0x317
initrd (hd0,0)/boot/initrd-2.6.3
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HTH |
I'm not using genkernel. Should I start using it? Has it any benefits? Your suggestions also seem to demand an installation of the initrd. I will configure it and see if it works... _________________ ---
Epikuros |
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