[yocto] kernel module override

[Ulf Samuelsson]

> 17 feb. 2019 kl. 14:57 skrev Russell Peterson <peterson.russell at gmail.com>:
> 
> Hello,
> 
> I have what I would think is an unusual requirement regarding a kernel module and could use some advice.
> 
> I have a kernel module that has been heavily modified... to the point where we have a separate recipe for it and treat it as an out-of-tree module.  This works by not setting the kernel config file to build that module and our meta layer builds and installs the module.  No problem... works fine for us.
> 
> The problem is that we now want to enable another module that relies on the module we build out of tree.  The issue is that the check config sees we have not enabled our out of tree module and thus the sanitized config does not contain this module that we want to enable.  If we enable the modified module in the config file there is, of course, a package conflict.
> 
> I have tried using "virtual/mymodule" preferred provider but that fails since it seems to have a recipe "granularity" and we still need virtual/kernel.  I have also messed around with KERNEL_MODULE_PACKAGE_PREFIX and KERNEL_MODULES_RDEPENDS_BLACKLIST but I get the sense I'm trying to put a square peg in a round hole.
> 
> I do realize this is an unusual situation and the question "why don't you just patch the existing driver in the kernel?" is obvious.  We do have our reasons that I won't go into.  
> 
> Is there any obvious way we can simply "eclipse" an existing kernel module with an out-of-tree module?  Is there a way I could add a config fragment that doesn't get validated/sanitized, for example?
> 
> Regards,
> 
> Russell
> 
> 
Rename your out of tree module to something else.
Patch the module that you want to replace so it does not do anything.
Enable it and build it.

You can also remove the dependency by patching the Kconfig files.

Ulf Samuelsson
> 
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