在linux的源代码中,有这样的一个文档Documentation/kernel-parameters.txt,它介绍了kernel的各个参数及其意义。 其次,kernel启动参数以空格分隔,而且是严格区分大小写的(如:mem和MEM是不一样的)。 再次,对于module特有的kernel参数写法是这样的,[module name].[parameter=XX],例如,
Note that ALL kernel parameters listed below are CASE SENSITIVE, and that a trailing = on the name of any parameter states that that parameter will be entered as an environment variable, whereas its absence indicates that it will appear as a kernel argument readable via /proc/cmdline by progra...
Linux内核也为视频参数的获取做好了函数,程序员可以通过bootloader传递过来的cmdline,轻松获得视频相关的参数(video=),处理函数位于drivers/video/fbmem.c的最后。video_setup函数在系统启动的时候解析cmdline中的“video=”参数,并将多个通过(video=)设置的参数字符串指针分别放到drivers/video/fbmem.c中全局的一个字符串...
static int parse_one(char *param, char *val, const struct kernel_param *params, unsigned num_params, s16 min_level, s16 max_level, int (*handle_unknown)(char *param, char *val)) { unsigned int i; int err; /* Find parameter */ for (i = 0; i < num_params; i++) { if (...
(r2) 必须是 kernel parameter list 的物理地址(parameter list 是由boot loader传递给kernel,用来描述设备信息属性的列表),所以将uboot传递进来的tags物理地址数值存入__atags_pointer指针( [r6] )中,__atags_pointer在第28行定义并通过42、56行将其加载到r6中,在arch/arm/kernel/setup.c中的setup_arch中将引用...
* * Note, no "add" uevent will be created with this call, the caller should set * up all of the necessary sysfs files for the object and then call * kobject_uevent() with the UEVENT_ADD parameter to ensure that * userspace is properly notified of this kobject's creation. */ int...
The kernel later passes the parameter to init when performing the user space start. For example, if you add -s to the kernel parameters, the kernel passes the -s to the init program to indicate that it should start in single-user mode. 当遇到无法理解的参数时,Linux内核会保存该参数。内核...
modprobe <module_name> <parameter_name>=<parameter_value> modprobe命令可以用于设置内核模块的参数。通过在加载模块时传递参数值,可以修改模块的行为。例如,要加载名为my_module的内核模块,并设置参数param1的值为value1,可以运行modprobe my_module param1=value1命令。 /lib/modules/4.1.15-00020-g2220661-dirt...
The kernel initializes the devices and its drivers. The kernel mounts the root filesystem. The kernel starts a program called init with a process ID of 1. This point is the user space start. init sets the rest of the system processes in motion. ...
Kernel启动时会解析cmdline,然后根据这些参数如console root来进行配置运行。 Cmdline是由bootloader传给kernel,如uboot,将需要传给kernel的参数做成一个tags链表放在ram中,将首地址传给kernel,kernel解析tags来获取cmdline等信息。 Uboot传参给kernel以及kernel如何解析tags可以看我的另一篇博文,链接如下: ...