bootdelay

void (void)
{
    
    s = bootdelay_process();
        s = getenv("bootdelay");
        bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;
        stored_bootdelay = bootdelay;

    autoboot_command(s);
        // 延迟指定时间
        abortboot(stored_bootdelay);
            while ((bootdelay > 0) && (!abort)) {
                --bootdelay;
                /* delay 1000 ms */
                ts = get_timer(0);
                do {
                    udelay(10000);	// 从这个代码来看，这个延时时间是1s
                } while (!abort && get_timer(ts) < 1000);

                printf("bbb%2d ", bootdelay);
            }

        // 启动
        s = getenv("bootcmd");
        run_command_list(s, -1, 0);
}