Problem in loading kernel

[Khosro Taraghi]

Hello Everybody,

I have a beagleboard Rev C4 and when I try to load the kernel from memory with bootm command, it shows me an error in the middle of loading kernel. This is the error message:

Waiting 1sec before mounting root device...
mmc0: new high speed SD card at address b368
mmcblk0: mmc0:b368 5     3.83 GiB 
 mmcblk0: p1
VFS: Cannot open root device "b302" or unknown-block(179,2)
Please append a correct "root=" boot option; here are the available partitions:
1f00             512 mtdblock0 (driver?)
1f01            1920 mtdblock1 (driver?)
1f02             128 mtdblock2 (driver?)
1f03            4096 mtdblock3 (driver?)
1f04          255488 mtdblock4 (driver?)
b300         4020224 mmcblk0 driver: mmcblk
  b301         4016128 mmcblk0p1
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)

I changed some environment variables to get result, but it failed with same error.

Could you please help me if you have any idea. Thanks a lot in advance.

Regards,

Khosro Taraghi
CTY student at Seneca

[Andy Green]

On 02/14/2011 03:43 PM, Somebody in the thread at some point said:
> Hello Everybody,
>
> I have a beagleboard Rev C4 and when I try to load the kernel from
> memory with bootm command, it shows me an error in the middle of loading
> kernel. This is the error message:
>
> Waiting 1sec before mounting root device...
> mmc0: new high speed SD card at address b368
> mmcblk0: mmc0:b368 5 3.83 GiB
> mmcblk0: p1
> VFS: Cannot open root device "b302" or unknown-block(179,2)

U-Boot env is telling it to load the rootfs from mmcblk0p2, but your SD 
card only have the one partition, p1.

-Andy

[itamar]

On Mon, Feb 14, 2011 at 1:43 PM, Khosro Taraghi
 wrote:
> Hello Everybody,
>
> I have a beagleboard Rev C4 and when I try to load the kernel from memory
> with bootm command, it shows me an error in the middle of loading kernel.
> This is the error message:
>
> Waiting 1sec before mounting root device...
> mmc0: new high speed SD card at address b368
> mmcblk0: mmc0:b368 5     3.83 GiB
>  mmcblk0: p1
> VFS: Cannot open root device "b302" or unknown-block(179,2)
> Please append a correct "root=" boot option; here are the available
> partitions:
> 1f00             512 mtdblock0 (driver?)
> 1f01            1920 mtdblock1 (driver?)
> 1f02             128 mtdblock2 (driver?)
> 1f03            4096 mtdblock3 (driver?)
> 1f04          255488 mtdblock4 (driver?)
> b300         4020224 mmcblk0 driver: mmcblk
>   b301         4016128 mmcblk0p1
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(179,2)
>
> I changed some environment variables to get result, but it failed with same
> error.
>
> Could you please help me if you have any idea. Thanks a lot in advance.
>
> Regards,
>
> Khosro Taraghi
> CTY student at Seneca

try to pass root delay parameter.

[Andy Green]

On 02/14/2011 03:53 PM, Somebody in the thread at some point said:
> > b300         4020224 mmcblk0 driver: mmcblk
> >    b301         4016128 mmcblk0p1
> try to pass root delay parameter.

But it already found and listed the partitions on his card.

-Andy

[Rahul Gundecha]

Can you please paste the values of all uboot env. variables.

Regards,
Rahul

On Mon, Feb 14, 2011 at 9:13 PM, Khosro Taraghi <
[e-mail]> wrote:
> Hello Everybody,
>
> I have a beagleboard Rev C4 and when I try to load the kernel from memory
> with bootm command, it shows me an error in the middle of loading kernel.
> This is the error message:
>
> Waiting 1sec before mounting root device...
> mmc0: new high speed SD card at address b368
> mmcblk0: mmc0:b368 5     3.83 GiB
>  mmcblk0: p1
> VFS: Cannot open root device "b302" or unknown-block(179,2)
> Please append a correct "root=" boot option; here are the available
> partitions:
> 1f00             512 mtdblock0 (driver?)
> 1f01            1920 mtdblock1 (driver?)
> 1f02             128 mtdblock2 (driver?)
> 1f03            4096 mtdblock3 (driver?)
> 1f04          255488 mtdblock4 (driver?)
> b300         4020224 mmcblk0 driver: mmcblk
>   b301         4016128 mmcblk0p1
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(179,2)
>
> I changed some environment variables to get result, but it failed with same
> error.
>
> Could you please help me if you have any idea. Thanks a lot in advance.
>
> Regards,
>
> Khosro Taraghi
> CTY student at Seneca
> _______________________________________________
> arm mailing list
> [e-mail]
> https://admin.fedoraproject.org/mailman/listinfo/arm

[Niels de Vos]

Hi Khosro,

On Mon, Feb 14, 2011 at 3:43 PM, Khosro Taraghi
 wrote:
> I have a beagleboard Rev C4 and when I try to load the kernel from memory
> with bootm command, it shows me an error in the middle of loading kernel.
> This is the error message:
>
> Waiting 1sec before mounting root device...
> mmc0: new high speed SD card at address b368
> mmcblk0: mmc0:b368 5     3.83 GiB
>  mmcblk0: p1
> VFS: Cannot open root device "b302" or unknown-block(179,2)
> Please append a correct "root=" boot option; here are the available
> partitions:
> 1f00             512 mtdblock0 (driver?)
> 1f01            1920 mtdblock1 (driver?)
> 1f02             128 mtdblock2 (driver?)
> 1f03            4096 mtdblock3 (driver?)
> 1f04          255488 mtdblock4 (driver?)
> b300         4020224 mmcblk0 driver: mmcblk
>   b301         4016128 mmcblk0p1
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(179,2)
>
> I changed some environment variables to get result, but it failed with same
> error.
>
> Could you please help me if you have any idea. Thanks a lot in advance.

Try with the following arguments:

root=/dev/mmcblk0p1 rootwait

This assumes the root filesystem is on the first partition on the SD-card.

Cheers,
Niels