如果创建节点报如下错误：
Major number:
BusyBox v1.5.0 (2009-01-19 08:42:35 CST) multi-call binary
Usage: mknod [OPTIONS] NAME TYPE MAJOR MINOR
Create a special file (block, character, or pipe)
Options:
-m Create the special file using the specified mode (default a=rw)
TYPEs include:
b: Make a block (buffered) device
c or u: Make a character (un-buffered) device
p
通常情况是因为，驱动源码中的驱动名称与安装节点时的驱动名称不符所致！
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