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Raspberry Pi 2 is unstable.

Former Member

Today has received the Pi2 and was totally disappointed. Is very unstable. I do not even managed to set up the system. After a minute or two system is down. Then apparently fray fs continue after any issues downloading the same message "End Kernel panic - not syncing: VFS Unable to mount root fs on unknown-block(0,0)". That's all.image

  • And also when I run startx see this warning... I think that something in him is not working properly.image

  • Did you migrate this from a B or B+ image by updating the distribution using sudo apt-get dist-upgrade? If so, did you previously overclock your Raspberry Pi? Old overclocking settings from Raspberry Pi 1 boards on the card will not work correctly with the Raspberry Pi 2. You will need to modify config.txt on the card by commenting out the arm_freq, core_freq, sdram_freq lines by prefixing them with a # symbol.

     

    If not, what card are you using? Are you using the latest 2015 Raspbian or Noobs image? If not, could you please image the card using the latest image from the Rapsberry Pi Foundation and see what happens.

     

    If you still have problems, it may be power or hardware related. Remember, the Raspberry Pi 2 with four cores requires a little more power - close to what the original Raspberry Pi 1 B required - so make sure you have at least 700mA of clean power available. Try using a quality MicroUSB B cable from an Android Phone or Tablet and see if that makes a difference.

     

    - Gough

  • in reply to Gough Lui

    Does the error at 2.62 secs into the boot indicate an issue with the micro SD card.

     

    By chance do you have another card that you can try.?

     

    Mark

  • in reply to Former Member

    I think Gough's comments are important. It is best to burn a new image from this year's distribution and choose the overclocking suited to the 2B.

     

    However, I have another gotcha. I went via a new image and booted OK. Then I did an upgrade. From then on, boots and reboots got past the kernel, drivers and mounting stage, but froze in a black screen before reaching the desktop. Sometimes it would work for a while and then the mouse and keyboard (single wireless dongle) would freeze or else the whole system would freeze.

     

    After several cycles of backing up the card after upgrading and loading software and rebuilding after crashes, I established that the wifi dongle plugged straight into one of the USB ports would cause the problem. Connecting via a powered port solved the problem.

     

    The wifi dongle does not get hot, but it seems to be taking enough power to disrupt the Raspi. I will try reducing the overclocking and overvoltage to see if that helps.

  • in reply to royleith

    The overclocking of the RAM seems to be the problem. The processor temperature never got too high, but there was a decided hot-electronics smell from somewhere. None of the chips on top were at all hot and so it seems it was the memory chip underneath that was cooking. My working config.txt settings are,

     

    #uncomment to overclock the arm. 700 MHz is the default.

    arm_freq=1000

     

     

    core_freq=500

    sdram_freq=450

    over_voltage=2

     

    The smell of hot electronics has gone (although I took it out of the case so that I could check all the chips for excessive heating) and the RAM chip is just warm. The case has got good ventilation near the memory chip and so I don't think that was the problem. I will let you know if it all goes pear-shaped when it goes back in its box.

  • I make one reply for everyone.

     

    1. Had installed latest RASPBIAN Debian Wheezy 2015-01-31 from scratch

    2. No overclocking.

    3. I tried 3(three) different and new flash micro SD with same results.

    4. Any attempt to install something in the system - and total of crash.

     

    I think it's just a factory marriage. But my chip is absolutely unstable.

  • in reply to Former Member

    Max

     

    Thanks for the update.

    One other thing to eleiminate all others ...power supply.

    Do you have another power supply to try.

     

    We've seen various issues previously which were rectified by changing to another supply/cord.

     

    Otherwise its looking like something to do with the interface to the card is faulty ...so should be a warranty claim.

     

     

    Mark

  • I would still be suspecting the supply voltage applied to the RPI2, this draws way more than its earlier versions (Quad Core and RAM etc)

     

    I will be doing some investigating soon and will post my findings

  • Actually you guys right - this is power supply issue. I tried next steps. Connect Pi2 to Li-Ion battery with USB. See pic. And all working perfect. No one faults over 2 hours. Ok. That is good. I made update and upgrade for apt-get. And further. Get short USB cable with ferrites and connect to another power supply. And whole day Pi2 works very good. No faults and much stable.
    Thanks everyone for advices and help!

     


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