mini2440系统移植篇之kernel启动流程

1.1.第1阶段

arch/arm/kernel/vmlinux.lds

--------------------Makefile

2.1 arch/arm/boot/compressed/start.S 解压代码

2.2 arch/arm/kernel/head.S

2.2.1 __lookup_machine_type 机器ID

àMACH_START

àmachine_desc //放在__arch_info_begin…__arch_info_end

2.2.2 __create_page_tables 创建页表

2.2.3 使能MMU

2.2.4 __switch_data

àb start_kernel 跳到C代码

1.2.第2阶段

2.3 init/main.c

2.3.1start_kernel

setup_arch(&command_line) 解析命令行参数

setup_processor();

setup_machine(machine_arch_type);

parse_tags(tags);

parse_cmdline(cmdline_p,from);

paging_init(mdesc);

devicemaps_init(mdesc);

mdesc->map_io()

setup_command_line(command_line)

parse_early_param()

do_early_param

init_IRQ()

console_init();

s3c24xx_serial_initconsole

reset_init()

kernel_init

prepare_namespace

mount_root 挂接文件系统

init_post