I have working kernel module which I install manually with insmod/modprobe command as learnt by reading book. however I was wondering if there is way to do it automatically after compiling - So basically how to automate insmod/modprobe command ?
My modprobe has a dependent file thread_module.o as well
My make file so far
obj-m := wakeup_counter.o
obj-m += thread_module.o
$INSTALL_MOD_PATH = /lib/modules/2.6.32-5-amd64/
all:
make -C /lib/modules/2.6.32-5-amd64/build M=$(PWD) modules
install:
make $(INSTALL_MOD_PATH) =/build modules_install
clean:
make -C /lib/modules/2.6.32-5-amd64/build M=$(PWD) modules
output after running : make install
root#xyz:/home/xyz/Desktop/Drivers/symbols# make install
make -C /lib/modules/2.6.32-5-amd64/build M=/home/xyz/Desktop/Drivers/symbols modules_install
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-5-amd64'
INSTALL /home/xyz/Desktop/Drivers/symbols/thread_module.ko
INSTALL /home/xyz/Desktop/Drivers/symbols/wakeup_counter.ko
DEPMOD 2.6.32-5-amd64
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-5-amd64'
Edit: After going through comments and https://www.kernel.org/doc/Documentation/kbuild/modules.txt I tried to add install command but I dont see any modules in the build path - Also at high level I get what we write in cmd prompt we type in Makefile but if someone can give an example it would help me to understand with nice base case to refer.
obj-m := wakeup_counter.o
obj-m += thread_module.o
KDIR = /lib/modules/2.6.32-5-amd64/build
all:
make -C $(KDIR) M=$(PWD) modules_install
clean:
make -C $(KDIR) M=$(PWD) clean
Example of command shell instruction being used as rule in Makefile:
install:
modprobe wakeup_counter
modprobe thread_module
Enhancing the answer posted by #cm161 for future users to highlight exact steps which worked for me
With below Makefile use following steps
Step 1: make ( type just make command) - for creation of modules i.e. .ko files and associated files
Step 2: make install
Step 3 : now do lsmod you should be able to see new modules
obj-m := wakeup_counter.o
obj-m += thread_module.o
KDIR = /lib/modules/2.6.32-5-amd64/build
all:
make -C $(KDIR) M=$(PWD) modules
cp wakeup_counter.ko /lib/modules/2.6.32-5-amd64/
cp thread_module.ko /lib/modules/2.6.32-5-amd64/
install:
modprobe wakeup_counter
modprobe thread_module
clean:
make -C $(KDIR) M=$(PWD) clean
Related
i was compiling a kernel module thermal.c at an ARCH linux distro using Makefile
Makefile:
obj-m += thermal.o
all:
make -C /lib/modules/$(uname -r)/build/ M=$(PWD) modules
clean:
make -C /lib/modules/$(uname -r)/build/ M=$(PWD) clean
the make command output is:
make -C /lib/modules//build/ M=/home/user/dir modules
make[1]: *** /lib/modules//build/: No such file or directory. Stop.
make: *** [Makefile:4: all] Error 2
uname -r output : 5.6.8-arch1-1
make expands the recipes before passing them to the shell. In your case make replaced $(PWD) by the value of the make variable named PWD (correct) but it also replaced $(uname -r) by the value of the make variable named uname -r. As there was no such make variable defined, the result was the empty string. Using $$(uname -r) solves the problem because make expands it as $(uname -r), exactly what you want to pass to the shell.
In summary, you must escape the $ you want to preserve from the make expansion by doubling them:
all:
make -C /lib/modules/$$(uname -r)/build/ M=$(PWD) modules
clean:
make -C /lib/modules/$$(uname -r)/build/ M=$(PWD) clean
I am trying to insert a kernel module using depmod and modprobe utilities in-order to resolve any dependencies. When I build the module it throws "Warning: modules_install: missing 'System.map' file. Skipping depmod."
And later when I try to execute modprobe it throws an error saying
"modprobe: FATAL: Module i2c_eeprom_client.ko not found in directory /lib/modules/4.19.58-v7+"
Below is the make file I am using:
obj-m += i2c_eeprom_client.o
KDIR = /lib/modules/$(shell uname -r)/build
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
make -C $(KDIR) M=$(PWD) modules_install
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
And below is the output of build:
make -C /lib/modules/4.19.58-v7+/build M=/home/pi/work/eeprom modules
make[1]: Entering directory '/usr/src/linux-headers-4.19.58-v7+'
Building modules, stage 2.
MODPOST 1 modules
make[1]: Leaving directory '/usr/src/linux-headers-4.19.58-v7+'
make -C /lib/modules/4.19.58-v7+/build M=/home/pi/work/eeprom
modules_install
make[1]: Entering directory '/usr/src/linux-headers-4.19.58-v7+'
INSTALL /home/pi/work/eeprom/i2c_eeprom_client.ko
DEPMOD 4.19.58-v7+
Warning: modules_install: missing 'System.map' file. Skipping depmod.
make[1]: Leaving directory '/usr/src/linux-headers-4.19.58-v7+'
How can i fix this problem ? Please help
Platform : Raspberry PI 3b+, Raspbian - linux 4.19.58-v7+
You can run depmod after the modules_install step. Also, it is better practice to separate the installation from the building to avoid having to build with root privileges:
obj-m += i2c_eeprom_client.o
# Default to running kernel's build directory if KDIR not set externally
KDIR ?= "/lib/modules/$(shell uname -r)/build"
all:
$(MAKE) -C "$(KDIR)" M="$(CURDIR)" modules
install:
$(MAKE) -C "$(KDIR)" M="$(CURDIR)" modules_install
depmod -A
clean:
$(MAKE) -C "$(KDIR)" M="$(CURDIR)" clean
Invoke as:
$ make
$ make install
I have Kernel module sources (for arm) and I would like to compile two different drivers from the same source.
The kernel in compiled with 2 source files and with cross compile.
MODULE_MAME = modulename
SRCS = drv/source.c lib/libsrc.c
OBJS = $(SRCS:.c=.o)
obj-m += $(MODULE_MAME).o
$(MODULE_MAME)-y = $(OBJS)
KDIR := /mykermelsources/
PWD := $(shell pwd)
all:
$(MAKE) -C $(KDIR) ARCH=arm M=$(PWD) modules
clean:
$(MAKE) -C $(KDIR) ARCH=arm M=$(PWD) clean
In one command, I would like to compile 2 modules.
Two choices:
Keeping 3 different Makefiles, one main that will call both other makefiles. One problem with this, I cannot make it working. make -f makefilediff or make --makefile=makefilediff give me an error.
Log:
make -C /mykermelsources/ ARCH=arm M=/home/mychardriver/ modules
make[1]: Entering directory '/mykermelsources'
scripts/Makefile.build:44: /home/mychardriver/Makefile: No such file or directory
make[2]: *** No rule to make target '/home/mychardriver//Makefile'. Stop.
make[1]: *** [_module_/home/mychardriver/] Error 2
make[1]: Leaving directory '/mykermelsources'
make: *** [all] Error 2
Transmitting command line parameter but it doesn't work. make SIDE=1
Seems the SIDE parameter/variable is never transmitted.
ifeq ($(SIDE),1)
MODULE_MAME = modulename_11
else
MODULE_MAME = modulename_22
endif
SRCS = drv/source.c lib/libsrc.c
OBJS = $(SRCS:.c=.o)a
obj-m += $(MODULE_MAME).o
$(MODULE_MAME)-y = $(OBJS)
KDIR := /mykermelsources/
PWD := $(shell pwd)
all:
$(MAKE) -C $(KDIR) ARCH=arm M=$(PWD) SIDE=$(SIDE) modules
clean:
$(MAKE) -C $(KDIR) ARCH=arm M=$(PWD) clean
How can I build 2 kernel modules from same multiple source files ?
Just faced this issue, and this is what I did:
For each moduleX you want to build, write a Kbuild_moduleX with the targets. Example:
obj-$(MODULE) += MODULE.o
MODULE-y := source.o
Then, in your Makefile_moduleX, do:
all:
cp Kbuild_moduleX Kbuild
make -C /lib/modules/$(shell uname -r)/build M=$(shell pwd) modules
rm Kbuild
This works because the kernel scripts will give Kbuild priority over reading Makefile.
To compile, do make -f Makefile_moduleX
Is it pretty? No. Does it work? Yes.
This is my makefile:
ifneq ($(KERNELRELEASE),)
obj-m := dmcdus_dd.o
else
KDIR := /usr/src/linux-headers-3.13.0-24-generic/
all:
$(MAKE) INSTALL_MOD_DIR=kernel/drivers/input/touchscreen -C $(KDIR) M=$$PWD modules_install
endif
clean:
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions sample Module.symvers
I have specified my required path where i have to move my dmcdus_dd.ko file using INSTALL_MOD_DIR & install it by modules_install. When i type "make" in the console i get the following results in the console:
make INSTALL_MOD_DIR=kernel/drivers/input/touchscreen -C /usr/src/linux-headers-3.5.0-49-generic/ M=$PWD modules_install
make[1]: Entering directory `/usr/src/linux-headers-3.5.0-49-generic'
DEPMOD 3.5.0-49-generic
make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-49-generic'
But when i go to the location "/lib/modules/3.5.0-49-generic/kernel/drivers/input/touchscreen" i dont see dmcdus.ko file in that directory... How can i copy my driver to that location?
Before installing first you need to make module using make -C $(KDIR) M=$(PWD) modules.
If you want to make little change in your makefile then write in following way:
ifneq ($(KERNELRELEASE),)
obj-m := dmcdus_dd.o
else
KDIR := /usr/src/linux-headers-3.13.0-24-generic/
all:
make -C $(KDIR) M=$(PWD) modules #I've changed makefile here
$(MAKE) INSTALL_MOD_DIR=kernel/drivers/input/touchscreen -C $(KDIR) M=$$PWD modules_install
endif
clean:
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions sample Module.symvers
And make sure that you have permission to copy file to destination (/input/touchscreen)folder. If not then change it.
The below makefile is sufficient for you to build and install module
obj-m := dmcdus_dd.o
KDIR := /usr/src/linux-headers-3.13.0-24-generic/
all:
make -C $(KDIR) M=$$PWD modules
make -C $(KDIR) M=$$PWD modules_install
clean:
make -C $(KDIR) M=$$PWD clean
If you specify INSTALL_MOD_DIR then the modules is moved to that directory
make INSTALL_MOD_DIR=kernel/drivers/input/touchscreen -C $(KDIR) M=$$PWD modules_install
I am having some problems regarding compiling device drivers for linux
when i compile i am getting the following error
No rule to make target /root/aarif/mydev.c', needed by/root/aarif/mydev.o'. Stop
the Makefile used is
obj-m=mydev.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
test:test.c
cc -o test test.c
thanks
Well do you have a mydev.c file?
Alternatively, try adding mydev-objs := test.o, assuming your source file is test.c