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Good night,

I am trying to recompile a kernel module from its source (in case you are wondering, it is the b43 driver module) on Debian 11. I've ran into a problem, which is that I want to specify some of the options expressed in the Kconfig file. I've been doing so with:

sudo make -C /lib/modules/$(uname -r)/build M=$(pwd) modules

However, I get no .config, no menu with the module menu. Furthermore, make menuconfig does not work giving the following output:

make: *** No rule to make target 'menuconfig'. Stop.

I am compiling the code in a folder which is out of the tree. I guess that doing this out of the tree is the cause of the menuconfig is failing. I tried to use the kconfig-frontend package, but I get no entries shown, eventhough Kconfig file should be correct.

What am I doing wrong?

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  • "…make -C…" "I am trying to recompile a kernel module from its source" ??? No! You are not! "I am compiling the code in a folder which is out of the tree" Fair enough but… how far is that far ? Do you get the linux kernel tree available anywhere I mean ? Did you care that, at least all headers will be found ? What is pwd when make menuconfig ? what are the makefiles available in the pwd ? Commented Jan 7, 2023 at 23:15
  • Ultimately : What are you doing wrong ? I just cannot tell precisely. Just too many are possible. While possibly easily correctable. We just do not get enough informations. (It could well be only me since I must acknowledge I do not know the b43 driver) Commented Jan 7, 2023 at 23:19
  • @MC68020 Thanks for the answer. The code is in a /home/user folder, and I have access to the include files as I have the linux-header package. The thing is that I cannot get a .config with the parameters that are presented in the Kconfig file. I want to debug the module. I cannot do make menuconfig in the directory of the external module (fair enough, i dont have the target coded in the custom makefile). So the question now is, how do one configure the external module with this Kconfig file. Commented Jan 7, 2023 at 23:53
  • OMG! b43 ! Broadcom! Of course ! I should have guessed ! yet another thingy that can't work without a firmware blob ! So sorry as43z ! Debugging that sort of things goes far beyond me. I understand this won't help you but… anyway : upvoting your question & wishing you the best in your quest. Commented Jan 8, 2023 at 0:10

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