Diff between kernel modules and default initialization

Hi Lyf,

I had worked with kernel modules, separately compiled and used for loading/unloading. How to make it available in default kernel and initialized during startup ?

Please check "modutils.sh" file from your filesystem "etc/init.d/modutils.sh"

If that file present then you have to create soft link with name staring "S" for loading and "K' for unloading.

Ex:

S20modutils.sh

Else,

For more easier,

You need to create 2 script file for loading module (inserting) while startup (switch ON) and removing the module while shutdown (reboot/switch OFF) and should place that file under your init runlevel.

Say e.g:

If you use init 5 runlevel then you have to create 2 script named "module_load.sh" and "module_unload.sh"

You have to places those file at "etc/init.d/" of your filesystem.

then you have to create link file for "module_load.sh"

ex:

link -s /etc/init.d/module_load.sh /etc/rc5.d/SXXmodule_load.sh

where 'XX' priority (minimum no will have get highest priority and will load soon)

Also, for "unloading", you have to create link file for "module_unload.sh"

ex:

link -s /etc/init.d/module_unload.sh /etc/rc5.d/KXXmodule_unload.sh

Note:

"module_load.sh" should have "insmod /opt/test.k"

module_unload.sh should have "rmmod test.ko"

Hi Titus,

Thanks for the reply.

The one you mentioned above is for automatically loading marked - kernel modules or marked - default kernel code during menuconfig ?

I could find some of the drivers are initialized during kernel initialization in the dmesg logs as "new <driver> registered". Those drivers are not loadable modules instead the default kernel code. So even that code needs to be initialized like this or if I mark as part of kernel code  it will automatically load itself ?

Regards,

Lyf

Hi Lyf,

In "make menuconfig",

If you want to build SPI driver as inbuilt with kernel, it must be like below,

[*] SPI support  --->

If you want to build SPI driver as loadable module ie insert "insmod spi.ko" when you need SPI support, it must be like below,

[M] SPI support  --->

Uuse "space" button to select kernel options.

Hi Titus,

Consider I am choosing the below option ,

In "make menuconfig",

If you want to build SPI driver as inbuilt with kernel, it must be like below,

[*] SPI support  --->

In this case, whether the SPI driver will be initialized by default or any special initialization is required during startup ?