Makefile template

1. Templates

1.1 Compile driver module

# -C $(KDIR)  Indicates to jump to the kernel source code directory and read there Makefile
# M=$(PWD)  Indicates that you will then return to the current directory to continue reading 、 Execute current Makefile

# Module name to be generated 
obj-m := GobiNet.o

# Generate the object file required by this module 
GobiNet-objs := GobiUSBNet.o QMIDevice.o QMI.o MPQMUX.o

KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
OUTPUTDIR=/lib/modules/`uname -r`/kernel/drivers/net/usb/

all: clean
	make -C $(KDIR) M=$(PWD) modules
# If cross compilation , be ：
	#make -C $(KDIR) M=$(PWD) modules ARCH=arm CROSS_COMPILE=/mnt/external/wangtao/8953/8953_APP_P/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi-

install: all
	mkdir -p $(OUTPUTDIR)
	cp -f GobiNet.ko $(OUTPUTDIR)
	depmod

clean:
	rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions Module.* modules.order

1.2 Compiling the application

CC=gcc
CFLAGS_WARN= -Wall

DEFINE=
INCLUDE= -I.

SOURCES=$(wildcard *.c)
OBJS=$(patsubst %.c,%.o,$(SOURCES))

TARGET= test

All:$(OBJS)
$(CC) -o $(TARGET)$(OBJS)
    rm -f *.o

%.o:%.c
$(CC) -c $(CFLAGS_WARN)$(DEFINE)$(INCLUDE) $< -o [email protected]
clean:
    rm -f $(OBJS)

2 . Add drivers to the development board

2.1 Compile into modules

（1） Create a new working folder under the source code hello;
（2） newly build c file , And edit ：

#include <linux/module.h>
#include <linux/init.h>

static int __init test_init(void)
{
    
printk("hello\n");
return 0;
}

static void __exit test_exit(void)
{
    
printk("bye\n");
}

module_init(test_init);
module_exit(test_exit);

（3） newly build makefile, And edit ：

obj-m := hello.o
modules-objs := hello.o
KERNELDIR := /mnt/external/wangtao/MDM9X07_LE11_MODEM/apps_proc/oe-core/build/tmp-glibc/work/mdm9607_perf-oe-linux-gnueabi/linux-quic/git-e3802ce3ddb62ec1c6b0484515a0523b8db30e2f-r3/build
PWD := $(shell pwd)

default:
	$(MAKE) -C $(KERNELDIR) ARCH=arm CROSS_COMPILE=/mnt/external/wangtao/MDM9X07_LE11_MODEM/apps_proc/oe-core/build/tmp-glibc/sysroots/x86_64-linux/usr/bin/arm-oe-linux-gnueabi/arm-oe-linux-gnueabi- M=$(PWD) modules
	
clean:
	$(MAKE) -C $(KERNELDIR) M=$(PWD) clean

（4） compile make, Generate ko file ;
（5） utilize FTP take ko File transfer to PC machine ;
（6） utilize adb take ko Download the file to the development board and modify the file permissions ：

adb push C:\Users\20190712125\Desktop\hello.ko /data
adb shell chmod 755 /data/hello.ko

（7） Load module ：

insmod hello.ko

（8） Check out the module ：

lsmod 

Be careful ：makefile Medium all： The back is tab Indent , Instead of space indentation （ Will report a mistake ）.

2.2 Compile into the kernel

（1） Create a new working folder under the source code hello;
（2） newly build c File and edit , ditto ;
（3） newly build Makefile And edit ：

obj-$(CONFIG_nwy_HELLO)+=hello.o

（4） newly build Kconfig And edit ：

config HELLO
	tristate"First Driver"
	default n
	help
	 This is the first driver.

（5） modify kernel/drivers/kconfig file , stay menu "Device Drivers" and endmenu Add a line between ：

$ source "drivers/hello/Kconfig"

such , perform make menuconfig when , You can configure hello Module compilation options .
（6） modify kernel/drivers/Makefile file , Add a row ：

obj-$(CONFIG_HELLO)+=hello/

（7） Modify the general config file
stay kernel/arch/arm/configs/ There are specified items in the directory defconfig file , Such as msm9607_defconfig file , Add a line to this file ：

CONFIG_HELLO=y

（9） Compiling the kernel ：make
（10） utilize adb Single burn kernel image .