浅析开发板相关函数init_machine即edb9312_init_machine什么时候执行

文件：init/main.c
start_kernel
==> setup_arch(&command_line);
文件：arch/arm/kernel/setup.c
setup_arch
    /*
     * Set up various architecture-specific pointers
     */
    init_arch_irq = mdesc->init_irq;
    system_timer = mdesc->timer;
    init_machine = mdesc->init_machine;

文件：arch/arm/kernel/setup.c
static int __init customize_machine(void)
{
    /* customizes platform devices, or adds new ones */
    if (init_machine)
        init_machine();
    return 0;
}
arch_initcall(customize_machine);
定义在了initcall里,所以他将和驱动程序一样在内核线程kernel_init中完成
start_kernel
==> rest_init
==*> kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); 创建内核线程

kernel_init
==> do_basic_setup
==*> do_initcalls
static void __init do_initcalls(void)
{
    initcall_t *call;

    for (call = __early_initcall_end; call < __initcall_end; call++)
        do_one_initcall(*call); // 将按照排序规则在相应的存储位置执行函数customize_machine()

    /* Make sure there is no pending stuff from the initcall sequence */
    flush_scheduled_work();
}

MACHINE_START(EDB9312, "Cirrus Logic EDB9312 Evaluation Board")
    /* Maintainer: Toufeeq Hussain */
    .phys_io    = EP93XX_APB_PHYS_BASE,
    .io_pg_offst    = ((EP93XX_APB_VIRT_BASE) >> 18) & 0xfffc,
    .boot_params    = EP93XX_SDCE3_PHYS_BASE_SYNC + 0x100,
    .map_io        = ep93xx_map_io,
    .init_irq    = ep93xx_init_irq,
    .timer        = &ep93xx_timer,
    .init_machine    = edb9312_init_machine,[luther.gliethttp]
MACHINE_END