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Please see the log: Can any one explain the reason for panic message and its solution: <4>Linux version 2.6.10_mvl401 (root@mstclindt02 (gcc version 3.4.3 (MontaVista 3.4.3-25.0.104.0600975 2006-07-06)) #1 Tue Sep 9 ...
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  1. #1
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    VFS: Unable to mount root fs on unknown-block(220,0)


    Please see the log:
    Can any one explain the reason for panic message and its solution:

    <4>Linux version 2.6.10_mvl401 (root@mstclindt02 (gcc version 3.4.3 (MontaVista 3.4.3-25.0.104.0600975 2006-07-06)) #1 Tue Sep 9 21:23:02 IST 2008
    <4>CPU: ARM926EJ-Sid(wb) [41069263] revision 3 (ARMv5TEJ)
    <4>CPU0: D VIVT write-back cache
    <4>CPU0: I cache: 16384 bytes, associativity 4, 32 byte lines, 128 sets
    <4>CPU0: D cache: 8192 bytes, associativity 4, 32 byte lines, 64 sets
    <4>Machine: DaVinci DM355 EVM
    <4>Warning: bad configuration page, trying to continue
    <4>Memory policy: ECC disabled, Data cache writeback
    <4>DM0000
    <4>DaVinci variant not supported
    <3> : failed to get UART1 clock
    <3> : failed to get UART2 clock
    <7>On node 0 totalpages: 4096
    <7> DMA zone: 4096 pages, LIFO batch:1
    <7> Normal zone: 0 pages, LIFO batch:1
    <7> HighMem zone: 0 pages, LIFO batch:1
    <4>Built 1 zonelists
    <4>Kernel command line: root=/dev//dev/root rootfs=ext2 ramdisk_size=32768 init=/bin/a.out initrd=0x83900000,4M console=ttyS0,115200n8
    <4>PID hash table entries: 128 (order: 7, 2048 bytes)
    <4>Console: colour dummy device 80x30
    <4>Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
    <4>Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
    <6>Memory: 16MB = 16MB total
    <5>Memory: 14912KB available (892K code, 234K data, 116K init)
    <4>Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
    <6>CPU: Testing write buffer coherency: ok
    <4>spawn_desched_task(00000000)
    <4>desched cpu_callback 3/00000000
    <4>ksoftirqd started up.
    <4>desched cpu_callback 2/00000000
    <4>desched thread 0 started up.
    <6>Linux NoNET1.0 for Linux 2.6
    <6>DaVinci: 104 gpio irqs
    <6>Registering platform device 'serial8250.0'. Parent at platform
    <6>Registering platform device 'musb_hdrc'. Parent at platform
    <4>NetWinder Floating Point Emulator V0.97 (double precision)
    <6>elevator: using anticipatory as default io scheduler
    <6>io scheduler noop registered
    <6>io scheduler anticipatory registered
    <4>RAMDISK driver initialized: 1 RAM disks of 32768K size 1024 blocksize
    <6>loop: loaded (max 8 devices)
    <4>*******
    <4>VFS: test name = </dev/root>
    <4>VFS: fs_name = <ext2>
    <4>VFS: tried fs_name = <ext2> err= -6
    <4>VFS: No root yet, retrying to mount root on root (unknown-block(220,0))
    <4>VFS: tried fs_name = <ext2> err= -6
    <4>VFS: No root yet, retrying to mount root on root (unknown-block(220,0))
    <4>VFS: tried fs_name = <ext2> err= -6
    <4>VFS: No root yet, retrying to mount root on root (unknown-block(220,0))
    <4>VFS: tried fs_name = <ext2> err= -6
    <4>VFS: No root yet, retrying to mount root on root (unknown-block(220,0))
    <4>VFS: tried fs_name = <ext2> err= -6
    <4>VFS: No root yet, retrying to mount root on root (unknown-block(220,0))
    <4>VFS: tried fs_name = <ext2> err= -6
    <4>VFS: No root yet, retrying to mount root on root (unknown-block(220,0))
    <4>VFS: Cannot open root device "root" or unknown-block(220,0)
    <4>Please append a correct "root=" boot option
    <0>Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(220,0)

  2. #2
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    is that really a correct root path?
    ...
    Kernel command line: root=/dev//dev/root rootfs=ext2 ramdisk_size=32768 init=/bin/a.out initrd=0x83900000,4M console=ttyS0,115200n8
    ...

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