How to modularize module in make menuconfig

Question

In the make menuconfig interface, I would like to modularize a module. I can set the module with a star (*). It's meaning the module will be compiled in core. I'm not able to set it with a M . I'm pressing on the M touch nothing happen.

Update

The target is to set available the DisplayLink module like this procedure : http://goo.gl/PQn362

Take care there are differences between the command applied in the video, the blog and my own interface of menuconfig I got with my raspberry PI (should be the version of the last one). In the video of the make menuconfig interface (at 4m:47s) the guy is setting the "DispalyLink USB framebuffer support" as modularize with M. I can not do the same. I can put a star (*) only.

However, the command in video make -j4 zImage modules dtbs doesn't work. The same command whithout the -j4 option works like in the blog. I've got this error message which is stopping the compilation :

CALL scripts/checksycalls.sh
CHK include/generated/compil.h
Kernel: arch/arm/boot/Image is ready
Kernel; arch/arm/boot/zImage is ready

The present Kernel configuration has modules disabled.
Type 'make config' and enable loadable module support.
Then build a kernel with module support enabled.

Makefile:1283 : the reciept of the taget modules failed
make: *** [modules] Erreur 1

I did make config but I understanding nothing about the question asked I edited the file .config I didn't find any issue.

Answer 1

This should be a top level choice in the main menu of menuconfig:

[ ] Enable loadable module support

You want to select that, then there is a submenu; the defaults there are probably fine particularly if you are just building a module and not the whole kernel.

Be warned though, if the source version you are using doesn't match the kernel you want to load this into, it won't work.