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This article mainly shows you how to write Ubuntu driver Makefile file, the content is simple and easy to understand, organized clearly, I hope to help you solve doubts, let Xiaobian lead you to study and learn "Ubuntu driver Makefile how to write" this article bar.

I. Makefile file format

KVERS = $(shell uname -r)

#Kernel modules

obj-m += globalmem.o

#Specify flags for the module compilation

#Enable modules that can contain debug information: globalmem.ko

#EXTRA_CFLAG = -g -o0

build:kernel_modules

kernel_modules:

make -C /lib/modules/$(KVERS)/build M=$(CURDIR) modules

clean:

make -C /lib/modules/$(KVERS)/build M=$(CURDIR) clean

II. Install and uninstall module commands

Installation module: insmod globalmem.ko

Uninstall module: rmmod globalmem.ko

Loading module: lsmod

View master device number: cat /proc/devices

Create a device node:

mknod /dev/globalmem0 c 250 0

mknod /dev/globalmem1 c 250 1

Delete Device Node:

rm /dev/globalmem0

rm /dev/globalmem1

Verify that the device reads:

echo "hello world1" > /dev/globalmem0

echo "hello world2" > /dev/globalmem1

cat /dev/globalmem0

cat /dev/globalmem0

Start two processes: blocking and non-blocking IO (one executing in the background and one writing to strings)

cat /dev/globalfifo &

echo 'i want to be' > /dev/globalfifo

The above is "Ubuntu driver Makefile how to write" all the content of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

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