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/sbin/uci: I/O error

  • Hello,

    I have an Onion Omega 2 running via the Arduino Dock 2. I am trying to setup wifi using the wifisetup command. After I select a network to connect to, I get the following error:

    uci: I/O error

    Restarting wifimanager for changes to take effect

    root@omega-9f#8:-# /sbin/uci: I/O error

    I would appreciate some help in figuring out this error.


  • @Aman-Chawla I saw this a few times myself. In my case I had done something resulting in memory getting mounted as read only, of course without realizing that had indeed happened. Therefore the uci parameter change could not be saved. Is there a chance your system is currently read only?


  • @William-Scott Thanks for your reply. How would I check that my device is not read-only at the moment?

  • See if you can touch a file in /etc/config. For example,

    cd /etc/config
    touch tempfile
    ls -la

    Is a file called tempfile there? If so, your file system isn't mounted read only as you just wrote to it. If there's a problem the "touch" command likely would have failed.

    Bear in mind there may dozens of reasons for a uci I/O error, my problem was merely one.


  • @William-Scott Thanks Bill, it does seem that my system is read-only. For example, when I just login to the device, I get the message:

    ``Your JFFS2-partition seems full and overlayfs is mounted read-only. Please try to remove files from /overlay/upper/.... and reboot.''

    Also, when I type in

    cd /etc/config
    touch tempfile

    I get the message: touch: tempfile: Read-only file system

  • @Aman-Chawla Looks like you nailed it! Now figure out why the file system is filled up and you'll be good to go.


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