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Structure Needs Cleaning Errors

kvikrama

Hi All,

 

   We are using microZED SOM along with AVNET FMC carrier card in one of our industrial products.

We are running a linux based system. In lab conditions the setup works fine. In industrial environment we are experiencing "Structure Needs Cleaning" errors on linux libraries.

This forces us to keep re-flashing the SDCards. Have been looking for source of this problem for sometime.

SOM is Industrial grade (AES-Z7MB-7Z020-SOM-I-G/REV-H) .

 

Notes (Not sure if these can cause issues) :-

    1. The board takes a PMOD CAN module to communicate.

    2. DDR3 Chip Surface Temperature is 55 deg C.

 

A similar setup is working well in same environment just few feet away (another machine).

 

Some of the suspects that we tested and eliminated (might need revisit if any of you advice).

1. We suspected power supply noise and done many checks and filters to remove them. Looks like power supply noise is not the reason.

2. We suspected the linux kernel / application and did many regressions in our lab setup. All of then came clean.

3. We suspected quality of SDCard and moved to industrial SDCard. Didnt resolve the issue.

4. Suspected thermal issues and reduced the temperature on chip surfaces a lot (using RPi heatsink on Zynq 7020 and reducing the CPU speed to half). Didnt help either.

    On DDR3 we havent added heatsink as it's almost always 55 deg C on all our installations.

5. Thought machine grounding can be a problem and wired PMOD CAN ground to machine ground (In addition to grounding the FMC card's mounting holes). Didnt help.

 

Any help thought will be of great help.

Parents

  • We've seen issues with SD Cards, especially generic cheap ones but even some name-brand. I'd be curious to know exactly what you are using. We have had very good success with Delkin Utility-class cards. To see why we use them, check out this blog:

    Storage Insights #1 - Why Not All SD Cards are Created Equal

     

    You should also review this Xilinx Answer Record.

    https://support.xilinx.com/s/article/66779

     

    Is there any chance that power can be interrupted during operation? That can do very bad things to SD cards when Linux isn't shut down properly.

     

    If you do a simple web search, you will find a wide number of answers that are all over the board. Whether they apply to you depends on what you are doing:

    • improper dismounts
      • For example, If the partition you want to unmount has samba shares on it, you need to stop the smbd service first.
    • access from a foreign OS (ie: Windows driver)
    • disk (pre)failure
    • main memory failure

     

    Bryan

  • in reply to bhfletcher

    Hi Bryan,

     

      We are using Apacer card - AK6.112FHA.00103. We have tried other commercial cards as well, frequency of issue doesn't change.

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