To activate the serial port communication for kernel debugging, you need to modify the same kernel configuration file.
为了激活串行端口通信以进行内核调试，您需要修改同一个内核配置文件。
If you've got a default configuration but you've just added a new kernel to your system, this might be enough to detect the new kernel and add it to your GRUB 2 configuration file.
如果已有默认配置，并在系统中刚加入新内核，只要在GRUB 2配置文件中检测并添加新内核就行了。
The rsyslogd daemon, through its configuration file in /etc/rsyslog.conf), understands the /proc file system kmsg interface and uses it to extract kernel logging messages.
rsyslogd 守护程序通过它的配置文件 /etc/rsyslog.conf 来理解 /proc 文件系统的 kmsg 接口，并使用这些接口获取内核日志消息。
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