驱动开发的同学经常会使用dmesg，里面有一些非常有用的参数记得要使用
# dmesg --help
Toybox 0.8.6-android multicall binary (see toybox --help)
usage: dmesg [-Cc] [-r|-t|-T] [-n LEVEL] [-s SIZE] [-w]
Print or control the kernel ring buffer.
-C Clear ring buffer without printing
-c Clear ring buffer after printing
-n Set kernel logging LEVEL (1-9)
-r Raw output (with <level markers>)
-S Use syslog(2) rather than /dev/kmsg
-s Show the last SIZE many bytes
-T Human readable timestamps
-t Don't print timestamps
-w Keep waiting for more output (aka --follow)
-w会非常有用，实时监控内核日志输出；系统生成新日志时会立即显示
dmesg -w |grep -iE deepinout