static int __init mxcuart_console_init(void)
{
register_console(&mxc_console);
return 0;
}
转而看register_console(&mxc_console)：
void register_console(struct console *console)
{
......
/*
* Put this console in the list - keep the
* preferred driver at the head of the list.
*/
acquire_console_sem();
if ((console->flags & CON_CONSDEV) || console_drivers == NULL) {
console->next = console_drivers;
console_drivers = console; //设定console_drivers为该console，后面printk信息生成的buffer就会送到该console里面打印出来
if (console->next)
console->next->flags &= ~CON_CONSDEV;
} else {
console->next = console_drivers->next;
console_drivers->next = console;
}
if (console->flags & CON_PRINTBUFFER) {
/*
* release_console_sem() will print out the buffered messages
* for us.
*/
spin_lock_irqsave(&logbuf_lock, flags);
con_start = log_start; //printk buffer的起始地方
spin_unlock_irqrestore(&logbuf_lock, flags);
}
release_console_sem();
}
这里我们就看注释的两个地方，可以知道，这个register_console的作用主要是将改port注册到printk，以备后面printk的信息buffer输出到改port上.
http://www.qrsdev.com/forum.php?mod=viewthread&tid=397&extra=page%3D1