Re: Kernel panic: VFS: Unable to mount root fs (Solved)

From: Alphonse Ogulla (ogulla_at_uonbi.ac.ke)
Date: 08/27/03

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    To: debian-user@lists.debian.org
Date: Wed, 27 Aug 2003 10:49:22 +0300

    On Tuesday 26 August 2003 14:56, Joris Huizer wrote:
    > --- Alphonse Ogulla <ogulla@uonbi.ac.ke> wrote:
    > > Hi all,
    > > Just compiled kernel 2.4.21 but cannot boot it
    > > despite creating the initrd
    > > image and respective links in / to files in /boot.
    > > The last 5 lines printed on screen before hang-up
    > > are printed below.
    > >
    > > RAMDISK: Couldn't find valid RAM disk image starting
    > > at 0.
    > > Freeing initrd memory: 2664k freed
    > > VFS: Cannot open root device "301" or 03:01
    > > Please append a correct "root=" boot option
    > > Kernel panic: VFS: Unable to mount root fs on 03:01
    > >
    > > Passing root=/dev/hda1 to lilo at boot time did not
    > > bear fruit.
    > > Created initrd as follows:
    > > # mkinitrd -o /boot/initrd.img-2.4.21
    > > /lib/modules/2.4.21
    > >
    > > Added the following lines in lilo.conf before
    > > running lilo.
    > > .....
    > > image=/vmlinuz-2.4.21 initrd=/initrd.img-2.4.21
    > > label=2.4.21
    > > root=/dev/hda1
    > > read-only
    > >
    > > Grateful for any assistance in resolving this
    > > difficulty.
    > >
    > > --
    > > Alphonse Ogulla
    > > Nairobi, Kenya
    >
    > Check that:
    >
    > - under "File systems", "Second extended fs support"
    > has "y"
    > - under "Block devices", "Normal PC floppy disk
    > support" has "y"
    > - under "ATA/IDE/MFM/RLL support", "IDE, ATA and
    > ATAPI Block devices" has "y"
    > - under submenu "IDE, ATA and ATAPI Block Devices",
    > "Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy
    > support" and "Include IDE/ATA-2 DISK support" have "y"
    > clicked.
    >
    > This helped me to solve similar problems - I hope
    > it'll help you too

    Yes it did.
    Coming to think of it, make exited with an error during the final step of
    kernel compilation - "make modules_install" because of dependancy issues with
    some *pmcia* and *mtd* modules. Therefore the resulting initrd.img created
    from /lib/modules/2.4.21 directory must have been lacking in some aspect.

    Building disk & filesystem drivers directly into the kernel as per above
    instructions and forgetting about initrd.img did the trick.

    atlas:~# uname -a
    Linux atlas 2.4.21 #3 Tue Aug 26 20:01:03 EAT 2003 i686 unknown

    Thanks and regards 

    -- 
Alphonse Ogulla
Nairobi, Kenya
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