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Linux/AM5728: cmemk: invalid module format

Gerard
Expert 1290 points

Part Number: AM5728

Tool/software: Linux

I'm using the AM5728 SoC with Processor SDK 03.03; I'm getting the following error when I try to load the CMEM kernel module:

cmemk: disagrees about version of symbol module_layout
cmemk: disagrees about version of symbol module_layout
insmod: can't insert '/lib/modules/4.4.41-gf9f6f0db2d/kernel/extra/cmemk.ko': invalid module format

I'm using the Linux 4.4.41 kernel out of the Processor SDK and using the pre-built cmemk.ko module from the very same Processor SDK. Given that both the kernel and pre-built module came out of the Processor SDK I would have expected everything to be in sync.

Is there a compiler option or kernel configuration option I need to ensure is enabled when I build the kernel?

Thanks

  • 0
    Expert 1290 points
    A little extra information:
    -bash-4.3# modinfo -F vermagic /lib/modules/4.4.41-gf9f6f0db2d/kernel/extra/cmemk.ko
    4.4.41-gf9f6f0db2d SMP preempt mod_unload modversions ARMv7 p2v8

    -bash-4.3# uname -a
    Linux board-0001 4.4.41-gf9f6f0db2d #1 SMP PREEMPT Mon Apr 17 12:16:26 EDT 2017 armv7l GNU/Linux
  • 0 in reply to Gerard
    TI__Guru 55345 points

    Hello Gerard,

    I've just installed SDK 03.03, and the cmemk module is in sync and it gets loaded successfully. The issue you are seeing about version of symbol module_layout is because of that the module is built against different kernel version different kernel config or your module is not properly compiled. Also there is no such /lib/modules/4.4.41-gf9f6f0db2d/kernel/extra/ directory in the Processor SDK, the path should be /lib/modules/4.4.41-gf9f6f0db2d/extra/. Also if you are rebuilding it don't forget to run the depmod -a command in order to generate the new modules.dep and map files. Also the cmemk module is apart from the kernel modules, you you should issue a make cmem-mod from the Processor SDK's top directory to recompile the cmemk module and install it by make cmem-mod_install command.

    Best regards,
    Kemal

  • 0 in reply to Kemal R. Shakir
    Expert 1290 points

    Kemal R. Shakir said:

    The issue you are seeing about version of symbol module_layout is because of that the module is built against different kernel version different kernel config or your module is not properly compiled. 

    I was assuming it was the kernel configuration that was the issue but wasn't sure what it could be since the PREEMPT matches.

    Kemal R. Shakir said:

    Also there is no such /lib/modules/4.4.41-gf9f6f0db2d/kernel/extra/ directory in the Processor SDK, the path should be /lib/modules/4.4.41-gf9f6f0db2d/extra/

    That path came from the Processor SDK itself: ti-processor-sdk-linux-am57xx-evm-03.03.00.04//linux-devkit/sysroots/armv7ahf-neon-linux-gnueabi/lib/modules/4.4.41-gf9f6f0db2d/extra/cmemk.ko

    Kemal R. Shakir said:

     you should issue a make cmem-mod from the Processor SDK's top directory to recompile the cmemk module and install it by make cmem-mod_install command.

    Ok, I'll rebuild the module and report back. I was hoping I could tweak something in the kernel configuration itself to make Processor SDK upgrades a little easier. The goal was to rebuild the kernel and be able to just pull in the latest Processor SDK's prebuilt CMEM kernel module.

    Thanks

  • 0 in reply to Gerard
    TI__Guru 55345 points

    You can also backup the default config and replace it with your custom one, as explained at this post.