[英]Can't compile kernel module for BeagleBone Debian
我正在遵循Derek Molloys的指南来构建可加载的内核模块,但是在某些时候会遇到困难。
我在.c文件中有内核代码: hello.c
#include <linux/init.h> // Macros used to mark up functions e.g., __init __exit
#include <linux/module.h> // Core header for loading LKMs into the kernel
#include <linux/kernel.h> // Contains types, macros, functions for the kernel
MODULE_LICENSE("GPL"); ///< The license type -- this affects runtime behavior
MODULE_AUTHOR("Derek Molloy"); ///< The author -- visible when you use modinfo
MODULE_DESCRIPTION("A simple Linux driver for the BBB."); ///< The description -- see modinfo
MODULE_VERSION("0.1"); ///< The version of the module
static char *name = "world"; ///< An example LKM argument -- default value is "world"
module_param(name, charp, S_IRUGO); ///< Param desc. charp = char ptr, S_IRUGO can be read/not changed
MODULE_PARM_DESC(name, "The name to display in /var/log/kern.log"); ///< parameter description
/** @brief The LKM initialization function
* The static keyword restricts the visibility of the function to within this C file. The __init
* macro means that for a built-in driver (not a LKM) the function is only used at initialization
* time and that it can be discarded and its memory freed up after that point.
* @return returns 0 if successful
*/
static int __init helloBBB_init(void){
printk(KERN_INFO "EBB: Hello %s from the BBB LKM!\n", name);
return 0;
}
/** @brief The LKM cleanup function
* Similar to the initialization function, it is static. The __exit macro notifies that if this
* code is used for a built-in driver (not a LKM) that this function is not required.
*/
static void __exit helloBBB_exit(void){
printk(KERN_INFO "EBB: Goodbye %s from the BBB LKM!\n", name);
}
/** @brief A module must use the module_init() module_exit() macros from linux/init.h, which
* identify the initialization function at insertion time and the cleanup function (as
* listed above)
*/
module_init(helloBBB_init);
module_exit(helloBBB_exit);
和这样的makefile: Makefile
obj-m+=hello.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
当我尝试在带有上述两个文件的目录中运行make
时,我得到了
Make:什么都做不了
我正在运行3.8.13-bone47 ,但无法在Derek建议的此链接上找到与之完全匹配的头文件,因此我改为下载3.8.13-bone71 。 这可能是问题吗? 直接在BeagleBone上编译时,是否必须下载标头? 我也尝试过将Makefile中的行更改为与我的(3.8.13-bone47)匹配的硬编码发行版名称,也不起作用。
非常感谢你们!
我解决了我的问题。 我有两个问题:
Makefile中缺少选项卡我用make语句在每行的开头添加了一个选项卡。 它必须是一个实际的选项卡,<\\ t>不适用于我。
错误的头文件事实证明, 头文件的正确版本非常重要:)我从http://rcn-ee.net/deb/trusty-armhf/v3.8.13-bone47/获得了文件,并添加了mach /timex.h文件,此后便可以遵循Derek的指南。
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