the parameter gets passed to init: parameters with ‘=’ go into init’s environment, others are passed as command line arguments to init. Everything after “–” is passed as an argument to init.
BOOT Is a boot loader parameter. Parameters denoted with BOOT are actually interpreted by the boot loader, and have no meaning to the kernel directly. Do not modify the syntax of boot loader parameters without extreme need or coordination with <Documentation/x86/boot.txt>. There are also arch...
就是parse_args传来的unknown_bootoption,代码如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /* * Unknown boot options get handed to init, unless they look like * unused parameters (modprobe will find them in /proc/cmdline). */ static int __init unknown_bootoption(char *param, ...
首先,kernel检查关键字是不是 ‘root=’, ‘nfsroot=’, ‘nfsaddrs=’, ‘ro’, ‘rw’, ‘debug’或’init’,然后内核在bootsetups数组里搜索于该关键字相关联的已注册的处理函数,如果找到相关的已注册的处理函数,则调用这些函数并把关键字后面的值作为参数传递给这些函数。比如,你在启动时设置参数name=a,...
A. 如果每次boot都要输入这么一大串字符,那真是太麻烦了。实际上我们可以在配置内核的时候打开build-in kernel command line将这些boot parameters都加进去。 B. 可以用efibootmgr添加一条我们专门的启动项,这样就可以直接boot了。 EFI stub的缺点 没有了GRUB的等待直接启动Linux当然可以速度飞快,这也是目前很多嵌入式...
There are a great number of optional Linux boot parameters. The official kernel documentation lists many, see,The kernel’s command-line parameters. That is just one type of option parameter. There are many others. The common way in which they are used at boot time and as part of a perma...
实际上我们可以在配置内核的时候打开build-in kernel command line将这些boot parameters都加进去。 B. 可以用efibootmgr添加一条我们专门的启动项,这样就可以直接boot了。 EFI stub的缺点 没有了GRUB的等待直接启动Linux当然可以速度飞快,这也是目前很多嵌入式Linux的做法,他们还通过精简编译选项将kernel调整的很小,...
看到,就是uboot的bootargs。 上面的微博有有对bootm分析,我只说一点 setup_start_tag (bd); //设置ATAG_CORE,这里面有params = (struct tag *) bd->bi_boot_params; 参数地址 kernel_entry(0, machid, bd->bi_boot_params); r0 = 0 r1 = machid r2 = bd->bi_boot_params) ...
parse_args(11 booting kernel11, commandjine, _startparam,stopparam _startparam, &unknovvn_bootoption);综述:对于比较新的版本真正起作用的函数,与2的parse_early_param();相比, 此处对解析列表的处理范围加大了,解析列表屮除了包括系统以setup定义的启 动参数,还包括模块中定义的param参数以及系统不能辨别的...
2. Introduction to Kernel Command-Line Parameters The Linux kernel can acceptcommand-line parametersto control various aspects of its behavior, such as specifying the root partition, enabling debug messages, disabling specific hardware drivers, setting boot delay, and more. The kernel command-line par...