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Do panic

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  Do panic Adrian <bulleid@ku.gro.lioff> - 2015-07-24 14:50 +0100
    Re: Do panic Stefan Enzinger <mindoms@aon.at> - 2015-07-24 17:09 +0200
      Re: Do panic Dom <domafp@blueyonder.co.uk> - 2015-07-24 16:38 +0100
      Re: Do panic Adrian <bulleid@ku.gro.lioff> - 2015-07-24 16:35 +0100
        Re: Do panic "John Williams (News)" <UCEbin@tiscali.co.uk> - 2015-07-24 16:50 +0100
        Re: Do panic Gordon Levi <gordon@address.invalid> - 2015-07-25 13:51 +1000

#9185 — Do panic

Raspberry Pi 2 running raspbian

I've run this Pi a few times, but recently I started to play with a bit 
more, and fitted a Pi Cam to it.  When I ran the config tool to enable 
the camera, it said it had to reboot, at which point it started to 
panic.

[ end Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown block(179,2)

A bit of rummaging online found this thread :

https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=47286

I tried the suggestion of changing the cmdline.txt file entry, but the 
only difference that made was changing the block to 179,6).

which originally dated from 2013, but has a final posting from last 
month suggesting that the problem hasn't been fixed.

Any suggestions on how to go ahead with this ?

Thanks

Adrian
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#9186

On 2015-07-24 15:50, Adrian wrote:
> Raspberry Pi 2 running raspbian
> 
> I've run this Pi a few times, but recently I started to play with a bit 
> more, and fitted a Pi Cam to it.  When I ran the config tool to enable 
> the camera, it said it had to reboot, at which point it started to 
> panic.
> 
> [ end Kernel panic - not syncing: VFS: Unable to mount root fs on 
> unknown block(179,2)
> 
> A bit of rummaging online found this thread :
> 
> https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=47286
> which originally dated from 2013, but has a final posting from last 
> month suggesting that the problem hasn't been fixed.

Have you seen the next to last posting? It mentions using a
better/stronger power supply. I wonder if that might help as you have
added new hardware.

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#9187

On 24/07/15 16:09, Stefan Enzinger wrote:
> On 2015-07-24 15:50, Adrian wrote:
>> Raspberry Pi 2 running raspbian
>>
>> I've run this Pi a few times, but recently I started to play with a bit
>> more, and fitted a Pi Cam to it.  When I ran the config tool to enable
>> the camera, it said it had to reboot, at which point it started to
>> panic.
>>
>> [ end Kernel panic - not syncing: VFS: Unable to mount root fs on
>> unknown block(179,2)
>>
>> A bit of rummaging online found this thread :
>>
>> https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=47286
>> which originally dated from 2013, but has a final posting from last
>> month suggesting that the problem hasn't been fixed.
>
> Have you seen the next to last posting? It mentions using a
> better/stronger power supply. I wonder if that might help as you have
> added new hardware.
>
This is good advice. The camera takes a lot more power. It is possible 
that running with insufficient power may have corrupted the SD card. 
Worst case is it will need to be replaced and/or restored from your 
latest backup.

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#9188

In message <d1f2pgF2b8uU1@mid.individual.net>, Stefan Enzinger 
<mindoms@aon.at> writes
>On 2015-07-24 15:50, Adrian wrote:
>> Raspberry Pi 2 running raspbian
>>
>> I've run this Pi a few times, but recently I started to play with a bit
>> more, and fitted a Pi Cam to it.  When I ran the config tool to enable
>> the camera, it said it had to reboot, at which point it started to
>> panic.
>>
>> [ end Kernel panic - not syncing: VFS: Unable to mount root fs on
>> unknown block(179,2)
>>
>> A bit of rummaging online found this thread :
>>
>> https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=47286
>> which originally dated from 2013, but has a final posting from last
>> month suggesting that the problem hasn't been fixed.
>
>Have you seen the next to last posting? It mentions using a
>better/stronger power supply. I wonder if that might help as you have
>added new hardware.
>

That did cross my mind, but I'm using a 2 amp power supply, which I 
would hope would be more than enough.  I wouldn't have thought that a Pi 
Cam would use that much power, but appreciate the extra straw on the 
camel's back situation.

Adrian
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#9189

In article <nn5lDEQ+slsVFwZ9@ku.gro.lloiff>,
   Adrian <bulleid@ku.gro.lioff> wrote:

> That did cross my mind, but I'm using a 2 amp power supply, which I 
> would hope would be more than enough.

But it's the possibility of voltage drop as current increases that may be
an issue.

So "better" might mean "more stable under load".

John

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#9194

Adrian <bulleid@ku.gro.lioff> wrote:

>In message <motqfl$ml8$1@dont-email.me>, rickman <gnuarm@gmail.com> 
>writes
>>On 7/24/2015 11:35 AM, Adrian wrote:
>>> In message <d1f2pgF2b8uU1@mid.individual.net>, Stefan Enzinger
>>> <mindoms@aon.at> writes
>>>> On 2015-07-24 15:50, Adrian wrote:
>>>>> Raspberry Pi 2 running raspbian
>>>>>
>>>>> I've run this Pi a few times, but recently I started to play with a bit
>>>>> more, and fitted a Pi Cam to it.  When I ran the config tool to enable
>>>>> the camera, it said it had to reboot, at which point it started to
>>>>> panic.
>>>>>
>>>>> [ end Kernel panic - not syncing: VFS: Unable to mount root fs on
>>>>> unknown block(179,2)
>>>>>
>>>>> A bit of rummaging online found this thread :
>>>>>
>>>>> https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=47286
>>>>> which originally dated from 2013, but has a final posting from last
>>>>> month suggesting that the problem hasn't been fixed.
>>>>
>>>> Have you seen the next to last posting? It mentions using a
>>>> better/stronger power supply. I wonder if that might help as you have
>>>> added new hardware.
>>>>
>>>
>>> That did cross my mind, but I'm using a 2 amp power supply, which I
>>> would hope would be more than enough.  I wouldn't have thought that a Pi
>>> Cam would use that much power, but appreciate the extra straw on the
>>> camel's back situation.
>>
>>These days you need a PSU with a pedigree.  Many of the inexpensive 
>>units are pure crap regardless of the current rating.  Try putting a 
>>load on it and look at the voltage on a scope.  You may see a lot of 
>>crap with low spikes that cause problems.
>>
>>I bought a USB hub with a PSU.  It dropped voltage with a 50 mA load. 
>>When I took it apart it only had a single transistor... no regulator 
>>chip at all.
>>
>
>Thanks for the quick follow ups.
>
>I don't have a scope,

You can use a USB meter. They cost less than five dollars and there
are dozens on eBay like this one <http://tinyurl.com/oyl59y4>. They
are not particularly accurate but will show you if the voltage varies
under load.
> but I've a mate who has, who likes this sort of 
>problem.


>
>No back up on this Pi as it is pretty well still straight out of the 
>box.
>
>
>Adrian

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