Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

cannot open root device

Hello All !

I built Kernel success on platform linux . but I got error when I load kernel to board .

.... cannot open root device "NULL" or unknown-block(0,0)

please append a correct "root =" boot option

kernel panic - not syncing : VFS: unable to mount root fs on unknown-block(0,0)

I think need to modify "Default kernel command string" when I configure kernel is it correct ? and I don't know how to modify that . please help me !!!

thanks .

14 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    --- Quote Start ---

    originally posted by hippo@Nov 18 2006, 02:50 AM

    no, you should use initramfs and don't specify kernel command string.

    the problem maybe you miss the rootfs.

    did you follow the uclinux-dist wiki page?

    http://nioswiki.jot.com/wikihome/operating...nux/uclinuxdist (http://nioswiki.jot.com/wikihome/operatingsystems/%c2%b5clinux/uclinuxdist)

    check if files exist in uclinux-dist/romfs.

    and run "make" and "make linux image" again.

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=19505)

    --- quote end ---

    --- Quote End ---

    Hi Hippo

    thanks for reply ! Yes I did step by step uclinux-dist wiki page and I have uClinux-dist/romfs . i using uClinux-dist-20060803.tar.bz2 . I built for board 1c12 and 2s60es but I got the same error :

    " .......

    Serial: JTAG UART driver $Revision: 1.1 $

    ttyJ0 at MMIO 0x80801080 (irq = 2) is a jtag_uart

    dm9000 Ethernet Driver

    TCP bic registered

    NET: Registered protocol family 1

    NET: Registered protocol family 17

    VFS: Cannot open root device "NULL" or unknown-block(0,0)

    Please append a correct "root=" boot option

    Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) "

    Can you help me ? Why ????

    thanks
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    --- Quote Start ---

    originally posted by dai_minh+nov 19 2006, 10:27 am--><div class='quotetop'>quote (dai_minh @ nov 19 2006, 10:27 am)</div>

    --- quote start ---

    <!--quotebegin-hippo@Nov 18 2006, 02:50 AM

    no, you should use initramfs and don&#39;t specify kernel command string.

    the problem maybe you miss the rootfs.

    did you follow the uclinux-dist wiki page?

    http://nioswiki.jot.com/wikihome/operating...nux/uclinuxdist (http://nioswiki.jot.com/wikihome/operatingsystems/%c2%b5clinux/uclinuxdist)

    check if files exist in uclinux-dist/romfs.

    and run "make" and "make linux image" again.

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=19505)

    --- quote end ---

    --- Quote End ---

    Hi Hippo

    thanks for reply ! Yes I did step by step uclinux-dist wiki page and I have uClinux-dist/romfs . i using uClinux-dist-20060803.tar.bz2 . I built for board 1c12 and 2s60es but I got the same error :

    " .......

    Serial: JTAG UART driver $Revision: 1.1 $

    ttyJ0 at MMIO 0x80801080 (irq = 2) is a jtag_uart

    dm9000 Ethernet Driver

    TCP bic registered

    NET: Registered protocol family 1

    NET: Registered protocol family 17

    VFS: Cannot open root device "NULL" or unknown-block(0,0)

    Please append a correct "root=" boot option

    Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) "

    Can you help me ? Why ????

    thanks

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=19513)</div>

    [/b]

    --- Quote End ---

    Check if files exist in uClinux-dist/romfs.

    And run "make" and "make linux image" again.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    Hi Hippo !

    I did but I got the same message error .

    ".....

    TCP: Hash tables configured (established 1024 bind 1024)TCP reno registeredio scheduler noop registeredio scheduler deadline registered (default)Serial: JTAG UART driver $Revision: 1.1 $ttyJ0 at MMIO 0x80801080 (irq = 2) is a jtag_uartTCP bic registeredNET: Registered protocol family 1NET: Registered protocol family 17VFS:

    cannot open root device "<null>" or unknown-block(0,0)

    please append a correct "root=" boot optionkernel panic - not syncing: vfs:

    unable to mount root fs on unknown-block(0,0)

    "

    I have uClinux-dist/romfs dir but romfs/bin and romfs/dev ,./lib ,../ mnt ,../proc ,../sys ,../tmp ,../usr , ../var

    dir is empty --> what wrong ????

    thanks .
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    --- Quote Start ---

    originally posted by vietluong@Nov 19 2006, 12:09 PM

    hi hippo !

    i did but i got the same message error .

    ".....

    tcp: hash tables configured (established 1024 bind 1024)tcp reno registeredio scheduler noop registeredio scheduler deadline registered (default)serial: jtag uart driver $revision: 1.1 $ttyj0 at mmio 0x80801080 (irq = 2) is a jtag_uarttcp bic registerednet: registered protocol family 1net: registered protocol family 17vfs:

    Cannot open root device "<NULL>" or unknown-block(0,0)

    Please append a correct "root=" boot optionKernel panic - not syncing: VFS:

    Unable to mount root fs on unknown-block(0,0)[/b]

    "

    I have uClinux-dist/romfs dir but romfs/bin and romfs/dev ,./lib ,../ mnt ,../proc ,../sys ,../tmp ,../usr , ../var

    dir is empty --> what wrong ????

    thanks .

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=19515)

    --- Quote End ---

    [/b]

    --- Quote End ---

    Please restore to default setting, and try again,

    make clean

    make menuconfig

    Kernel/Library/Defaults Selection --->

    (linux-2.6.x) Kernel Version

    (None) Libc Version

    [*] Default all settings (lose changes)

    [ ] Customize Kernel Settings

    [ ] Customize Vendor/User Settings

    [ ] Update Default Vendor Settings

    Then <exit> <exit> <yes>

    do not change any other setting until first boot successfully.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    Hi hippo !

    I did :

    + make clean

    + rm -rf romfs

    + make vendor_hwselect SYSPTF=~/...../standard_1c12.ptf

    + make romfs

    + make menuconfig

    [*] Default all settings (lose changes)

    [ ] Customize Kernel Settings

    [ ] Customize Vendor/User Settings

    [ ] Update Default Vendor Settings

    Then <exit> <exit> <yes>

    + make

    + make linux image .

    then I load zImage to board and this is message I got :

    uClinux/Nios II

    Altera Nios II support © 2004 Microtronix Datacom Ltd.

    Built 1 zonelists

    Kernel command line:

    PID hash table entries: 128 (order: 7, 512 bytes)

    Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)

    Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)

    Memory available: 14872k/16384k RAM, 0k/0k ROM (1195k kernel code, 157k data)

    Mount-cache hash table entries: 512

    NET: Registered protocol family 16

    NET: Registered protocol family 2

    IP route cache hash table entries: 1024 (order: 0, 4096 bytes)

    TCP established hash table entries: 1024 (order: 0, 4096 bytes)

    TCP bind hash table entries: 1024 (order: 0, 4096 bytes)

    TCP: Hash tables configured (established 1024 bind 1024)

    TCP reno registered

    io scheduler noop registered

    io scheduler deadline registered (default)

    Serial: JTAG UART driver $Revision: 1.1 $

    ttyJ0 at MMIO 0x80801080 (irq = 2) is a jtag_uart

    dm9000 Ethernet Driver

    TCP bic registered

    NET: Registered protocol family 1

    NET: Registered protocol family 17

    No filesystem could mount root, tried:

    Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

    thank very much !!!
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    --- Quote Start ---

    originally posted by hippo@Nov 19 2006, 10:36 PM

    it looks like the initramfs was empty,

    please check if you have files in romfs/bin ?

    please check initramfs content as in the wiki page,

    http://nioswiki.jot.com/wikihome/operating...initramfsupdate (http://nioswiki.jot.com/wikihome/operatingsystems/%c2%b5clinux/initramfsupdate)

    which linux distro do you use?

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=19527)

    --- quote end ---

    --- Quote End ---

    Hi hippo !

    yes . I don&#39;t have any file in romfs/bin .

    I build kernel on Linux platform . I have 3 file : nios2gcc.tar.bz2 + uClinux-dist-20060803.tar.bz2 + uClinux-dist-200608003-nios2-02.diff.gz and i did step by step in uclinux-dist wiki page .

    I think some file is wrong ? is it correct !!!

    thanks !
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    --- Quote Start ---

    originally posted by vietluong+nov 20 2006, 12:20 pm--><div class='quotetop'>quote (vietluong @ nov 20 2006, 12:20 pm)</div>

    --- quote start ---

    <!--quotebegin-hippo@Nov 19 2006, 10:36 PM

    it looks like the initramfs was empty,

    please check if you have files in romfs/bin ?

    please check initramfs content as in the wiki page,

    http://nioswiki.jot.com/wikihome/operating...initramfsupdate (http://nioswiki.jot.com/wikihome/operatingsystems/%c2%b5clinux/initramfsupdate)

    which linux distro do you use?

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=19527)

    --- quote end ---

    --- Quote End ---

    Hi hippo !

    yes . I don&#39;t have any file in romfs/bin .

    I build kernel on Linux platform . I have 3 file : nios2gcc.tar.bz2 + uClinux-dist-20060803.tar.bz2 + uClinux-dist-200608003-nios2-02.diff.gz and i did step by step in uclinux-dist wiki page .

    I think some file is wrong ? is it correct !!!

    thanks !

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=19528)</div>

    [/b]

    --- Quote End ---

    What Linux platform do you use?

    It maybe romfs install problem.

    Check if busybox built,

    ls -l user/busybox/busybox
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    Hi Hippo !

    yes I think it have problem when install romfs . but how is it resolve ?

    I use Fedora core 5 .

    thank very much for help !!!