[android-developers] kernel panic

[yenchengwang]

hi all,

    I always get the error message below while kernel booting~ 

    CONFIG_CMDLINE="console=ttyS0, 115200 mem=128M uard_dma android"

    

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

    please append a correct "root=" boot option; here are the available partitions:

    1f00           1024 mtdblock0 (driver?)

    1f01           3072 mtdblock1 (driver?)

    1f02          65536 mtdblock2 (driver?)

    1f03         177536 mtdblock3 (driver?)

     ....

    1f07              512 mtdblock7 (driver?)

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

    I also tried

    CONFIG_CMDLINE="root=/dev/mtdblock2 rw init=/init console=ttyS0, 115200 mem=128M uard_dma android"

    VFS: Cannot open root device "mtdblock2" or unknown-block(31,2)

    please append a correct "root=" boot option; here are the available partitions:

    1f00           1024 mtdblock0 (driver?)

    1f01           3072 mtdblock1 (driver?)

    1f02          65536 mtdblock2 (driver?)

    1f03         177536 mtdblock3 (driver?)

     ....

    1f07              512 mtdblock7 (driver?)

    kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31, 2)

    need some advance~~thanks !!

--
Regards
Y-C Wang

[Deva R]

Probably your bootargs passed from uboot override it??
Check in your kernel bootup log, what exactly the bootargs that kernel receives.. (will be shown as "Kernel command line: xxxxxxxxx"
-Deva

PS.
My sample log.,

Starting kernel ...

Uncompressing Linux......................................................................................................................................................................... done, booting the kernel.
Linux version 2.6.32.9 (deva@ubuntu) (gcc version 4.3.3 (Sourcery G++ Lite 2009q1-203) ) #1 SMP PREEMPT Sat Jul 10 00:53:57 IST 2010
CPU: ARMv7 Processor [410fc091] revision 1 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: OMAP4430 4430SDP board
Memory policy: ECC disabled, Data cache writealloc
OMAP4430 ES1.0
SRAM: Mapped pa 0x40300000 to va 0xfe400000 size: 0x100000
Reserving 14745600 bytes SDRAM for VRAM
PERCPU: Embedded 8 pages/cpu @c17a4000 s10080 r8192 d14496 u65536
pcpu-alloc: s10080 r8192 d14496 u65536 alloc=16*4096
pcpu-alloc: [0] 0 [0] 1
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 117602
Kernel command line: console=ttyO2,115200n8 root=/dev/mmcblk0p2 rw mem=463M init=/init omapfb.vram=0:4M androidboot.console=ttyO2
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)

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[ycwang]

hmm~
thanks ur reply, I'v fixed tha't problem...but I don't know why?
I just repleced the root directly by an original one in the kernel
source.

On 7月13日, 上午2時31分, Deva R <r.deva...@gmail.com> wrote:
> Probably your bootargs passed from uboot override it??
> Check in your kernel bootup log, what exactly the bootargs that kernel
> receives.. (will be shown as "Kernel command line: xxxxxxxxx"
> -Deva
>
> PS.
> My sample log.,
>
> Starting kernel ...
>
> Uncompressing
> Linux...................................................................... ........................................................................... ........................
> done, booting the kernel.
> Linux version 2.6.32.9 (deva@ubuntu) (gcc version 4.3.3 (Sourcery G++ Lite
> 2009q1-203) ) #1 SMP PREEMPT Sat Jul 10 00:53:57 IST 2010
> CPU: ARMv7 Processor [410fc091] revision 1 (ARMv7), cr=10c53c7f
> CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
> Machine: OMAP4430 4430SDP board
> Memory policy: ECC disabled, Data cache writealloc
> OMAP4430 ES1.0
> SRAM: Mapped pa 0x40300000 to va 0xfe400000 size: 0x100000
> Reserving 14745600 bytes SDRAM for VRAM
> PERCPU: Embedded 8 pages/cpu @c17a4000 s10080 r8192 d14496 u65536
> pcpu-alloc: s10080 r8192 d14496 u65536 alloc=16*4096
> pcpu-alloc: [0] 0 [0] 1
> Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 117602

> *Kernel command line: console=ttyO2,115200n8 root=/dev/mmcblk0p2 rw mem=463M
> init=/init omapfb.vram=0:4M androidboot.console=ttyO2*

> PID hash table entries: 2048 (order: 1, 8192 bytes)
> Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
>

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