cmdline的初始化:start_kernel()->setup_arch()将 commad_line 指向boot_command_line。很明显,这个变量将记录 cmdline。 *cmdline_p = boot_command_line; 但是内核从哪里获取 bootloader 传递的 cmdline 以及在哪里对boot_command_line初始化呢? boot_command_line 定义在init/main.c文件中char __initdata boo...
20: config CMDLINE_FORCE 21: bool "Always use the default kernel command string" 22: help 23: Always use thedefault kernel command string, evenif the boot 24: loader passes other arguments to the kernel. 25: This is usefulif you cannot or don't want to change the 26: command-line o...
See Documentation/block/cmdline-partition.txt boot_delay= Milliseconds to delay each printk during boot. Values larger than 10 seconds (10000) are changed to no delay (0). Format: integer bootmem_debug [KNL] Enable bootmem allocator debug messages. bert_disable [ACPI] Disable BERT OS support ...
There are also arch-specific kernel-parameters not documented here. See for example <Documentation/x86/x86_64/boot-options.txt>. 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 a...
boot_command_line: 存在于.init.data段。最初是default_command_line的拷贝。 command_line: 存在于.init.data段。在parse_cmdline()中被赋值,数据来源是default_command_line。 saved_command_line: 用于保存没有处理过的命令行参数,是boot_caommand_line的拷贝。
linux kernel的cmdline参数解析原理分析 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。
10、and_line是setup_arch函数传递出来的值;_startparam是param参数的起始地址,在system.map文件中能看到_stopparam - _startparam 是参数个数unknown_bootoption是对应与启动参数不是param的相应处理函数同样跟进去最核心的函数也是parse_args (同2中分析): parse_args(nearly options", tmp_cmdline, null, 0, ...
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: ...
To force the kernel to use boot options by default we need to edit the /etc/defaults/grubfile. Initially, that file will contain a line that looks something like GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" To make the boot options take effect on subsequent starts the parameters are added to...
一、u-boot启动详细函数调用流程 首先给大家先看一下,u-boot启动从入口函数到启动内核的详细函数调用流程的层级关系图,对u-boot启动的整体有一个快速了解,后面会详细介绍各个函数的作用。 u-boot:启动详细的代码调用流程u-boot.lds:(arch/arm/cpu/u-boot.lds)|-->_start:(arch/arm/lib/vectors.S)|-->res...