Re: [Buildroot] how can i implement my kernel module and debug it

[Andreas Ziegler <br015@umbiko.net>]

Hi Esaïe

<appended Buildroot list>

On 2021-10-18 23:19, Esaïe Ledoux NJONGSSI KOUAM wrote:
> my kernel module works very well ,
> 
> in qemu , i have type lsmod , but nothing , doesn't it means that
> linux kernel image doesn't build ??

<cut>

With the original config files, the module will not be built. Once it 
gets built, the missing modules_install may prevent copying it into 
/lib/modules in the target.

To see which steps were executed by Buildroot, run

$ grep kernel-module build/build-time.log

This file contains timestamps of all tasks executed by the Buildroot 
environment.

> i have make something like you have said , but the problem still occur

-- Make sure your configuration is visible to Buildroot. You must be 
able to select it in the menu editor (make nconfig).

-- Build your module separately by calling 'make kernel-module-rebuild' 
and analyze the output. You should get headings for the separate build 
steps (downloading, extracting, patching, configuring, building, 
installing). Some sections may be missing or empty, but at least 
'building/installing' must show output from your module. You might also 
run build steps separately, until you find the one that fails; see [4]

-- Verify that the directory build/kernel-module exists and contains the 
expected files.

-- Check target/lib/modules/${BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE} to 
see if your module is included.

Kind regards,
Andreas

[4] https://buildroot.org/downloads/manual/manual.html#pkg-build-steps
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