imx6 启动 init进程

之前不知道imx6内核是怎么启动文件系统的init进程，查了下资料，记录于此，以后再来补充。

kernel/init/main.c

static noinline int init_post(void)
{
    /* need to finish all async __init code before freeing the memory */
    async_synchronize_full();
    free_initmem();
    mark_rodata_ro();
    system_state = SYSTEM_RUNNING;
    numa_default_policy();


    current->signal->flags |= SIGNAL_UNKILLABLE;

    if (ramdisk_execute_command) {
        run_init_process(ramdisk_execute_command);
        printk(KERN_WARNING "Failed to execute %s\n",
                ramdisk_execute_command);
    }


    /*
     * We try each of these until one succeeds.
     *
     * The Bourne shell can be used instead of init if we are
     * trying to recover a really broken machine.
     */
    if (execute_command) {
        run_init_process(execute_command);
        printk(KERN_WARNING "Failed to execute %s.  Attempting "
                    "defaults...\n", execute_command);
    }
        // 启动init进程
    run_init_process("/sbin/init");
    run_init_process("/etc/init");
    run_init_process("/bin/init");
    run_init_process("/bin/sh");

    panic("No init found.  Try passing init= option to kernel. "
          "See Linux Documentation/init.txt for guidance.");
}

Tony Liu

2016-8-30, Shenzhen