I have written a kernel module for a study research project that is a driver for seven segment displays connected to a Raspberry Pi (I am pretty new to kernel development). I would like to permanently install the module and load it at boot time when it is compiled, so I added the install
target to my Makefile
which allows the user to directly compile and install it.
I found out that all kernel modules are located somewhere inside /lib/modules/<kernel version>/kernel
, so I thought I just had to copy the compiled module into a subdirectory and list the module in the modules.order
and modules.dep
files. However, this approach did not work and since I could not find any resources to that topic, I am a little desperate.
This is what my Makefile currently looks like:
# All source files are inside the src directory
obj-m := src/sevenseg.o
all:
make -C /lib/modules/$(shell uname -r)/build EXTRA_CFLAGS=-I$(PWD)/src M=$(PWD) modules
mv src/sevenseg.ko .
install:
make -C /lib/modules/$(shell uname -r)/build EXTRA_CFLAGS=-I$(PWD)/src M=$(PWD) modules
mkdir -p /lib/modules/$(shell uname -r)/kernel/drivers/sevenseg
cp src/sevenseg.ko /lib/modules/$(shell uname -r)/kernel/drivers/sevenseg
echo "kernel/drivers/sevenseg/sevenseg.ko:" >> /lib/modules/$(shell uname -r)/modules.dep
echo "kernel/drivers/sevenseg/sevenseg.ko" >> /lib/modules/$(shell uname -r)/modules.order
insmod src/sevenseg.ko
make clean
clean:
rm -rf src
How do I tell the kernel that it should load the module sevenseg.ko
at boot time?
tldr;
# echo 'my-module-name' >> /etc/modules
Longer explanation:
Consult the documentation on insmod
, modprobe
, and modprobe.conf
.
Here's a decent tutorial: https://www.cyberciti.biz/faq/linux-how-to-load-a-kernel-module-automatically-at-boot-time/
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