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v4l2_dbg(1, debug, sd, "End of tvp7002_init.\n");调式输出在终端上

Other Parts Discussed in Thread: TVP7002

请教,就是驱动中有类似:
  v4l2_dbg(1, debug, sd, "End of tvp7002_init.\n");
  v4l2_info( "End of tvp7002_init.\n");
 .......
等这样的函数,如何能在串口中看到其输出的信息呢?
比如要看dev_dbg("End of tvp7002_init.")这个调试函数信息,我只要设置#define DEBUTG 1和修改printk.c中的console_loglevel就可以了。
那上面的那些函数该设置什么才可以看到打印信息呢?谢谢.......