Kernel Version mismatch on cross-compiling kernel modules (using onion/omega2-source docker)

  • Hello,
    I'm new here and I'm working on a project using omega2.

    I'm trying to build some kernel module (kmod-batman-adv, kmod-i2c-algo-bit, ...) using the cross-compiling docker prepared from onion ( I've followed the tutorial ( and other useful links but the result is that the modules compiled inside the docker are compiled for kernel 4.4.74-1, while the omega 0.2.0 b194 has kernel 4.4.74.

    When I try to install the compiled ipk on my omega, this is what I get:

    root@Omega-D339:/tmp# opkg install ./kmod-i2c-algo-bit_4.4.74-1_mipsel_24kc.ipk
    Installing kmod-i2c-algo-bit (4.4.74-1) to root...
    Collected errors:

    • satisfy_dependencies_for: Cannot satisfy the following dependencies for kmod-i2c-algo-bit:
    • kernel (= 4.4.74-1-8274f1be988bfc7fa195bc75194d9e87) *
    • opkg_install_cmd: Cannot install package kmod-i2c-algo-bit.

    If I run uname -a, what I see is:

    root@Omega-D339:/tmp# uname -a
    Linux Omega-D339 4.4.74 #0 Tue Jul 31 16:32:08 2018 mips GNU/Linux

    So, my question is: How can I cross compile kernel modules for omega2 official firmware?

    Thank you for your help,

  • Update:
    I've found that the compiling process inside my docker has created a kernel_4.4.74-1-8274f1be988bfc7fa195bc75194d9e87_mipsel_24kc.ipk

    So, I installed this package on my onion2, rebooted (no dmesg errors) and now I can correctly install my kernel modules without errors.

    The question remain, because I don't want to use a custom kernel. I want to use the official omega2 firmware and then install my kernel module for the official kernel.

    How can I obtain this?

    Thanks again,

  • Update 2:

    I've found this topic from @Maximilian-Gerhardt (Thank you for your excellent guide), explaining how to build kernel module for Omega2. I've found this in his topic:

    It conveniently compiled the hello-world.ko file and even created an ipk package.
    Unfortunetly, trying to installing that package will give you a kernel mismatch error
    because the kernel hashes differ (see this link). Loading the .ko file directly will still work though.

    So, I'm able to compile the kernel modules I need (copying the .ko files in /lib/modules/4.4.74/, but the ipk still does not match.

    Any suggestions to compile ipk kernel modules for official firmware?

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