Two makefile files for linux driver loading

Source: Internet
Author: User
During the loading of the two makefile files of the linux driver to the driver, a Makefile file is required to complete the compilation Command. I often confuse the commands in Makefile. this time, I specially studied the stuff in the Makefile file. I will share it with you in a short form...
During the loading of the two makefile files of the linux driver to the driver, a Makefile file is required to complete the compilation Command. I often confuse the commands in Makefile. this time, I specially studied the stuff in the Makefile file. I will share with you a simple driver example: www.2cto.com [plain]/* ==================================== ========================================== A kernel module: book This example is to introduce module params The initial developer of the original code is Baohua Song. all Rights Reserved. ========================================================== ===================================== */# include # Include MODULE_LICENSE ("Dual BSD/GPL"); www.2cto.com static char * book_name = "dissecting Linux Device Driver"; static int num = 4000; static int book_init (void) {printk (KERN_INFO "book name: % s \ n", book_name); printk (KERN_INFO "book num: % d \ n", num); return 0 ;} static void book_exit (void) {printk (KERN_INFO "Book module exit \ n");} module_init (book_init); module_exit (book_exit); module_param (num, int, S _ IRUGO); module_param (book_name, charp, S_IRUGO); MODULE_AUTHOR ("Song Baohua, author@linuxdriver.cn"); MODULE_DESCRIPTION ("A simple Module for testing module params "); MODULE_VERSION ("V1.0"); two Makefile files can be written in either of the following ways: [html] # Add your debugging flag (or not) to CFLAGS ifneq ($ (KERNELRELEASE),) obj-m: = boot. o else KERNELDIR? =/Lib/modules/$ (shell uname-r)/build PWD :=$ (shell pwd) default: $ (MAKE)-C $ (KERNELDIR) M = $ (PWD) modules endif www.2cto.com another one is: [plain] # Add your debugging flag (or not) to CFLAGS ifneq ($ (KERNELRELEASE),) obj-m: = boot. o else KERNELDIR? =/Usr/src/linux-headers-2.6.38-8-generic PWD: = $ (shell pwd) default: $ (MAKE)-C $ (KERNELDIR) M = $ (PWD) modules endif compare the two, we can find that, the only difference between the two makefiles is the difference between KERNELDIR
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