看到u-boot文档中有如下说明:
The behaviour of some commands depends on the configuration of U-Boot and on the definition of some variables in your U-Boot environment.
boot命令的说明中明确指出会调用bootcmd环境变量,boot - boot default, i.e., run 'bootcmd'。
但我看到tftp命令不指定参数时其实也调用了环境变量但在tftp命令中并未说明。
tftpboot - boot image via network using TFTP protocol
Usage:
tftpboot [loadAddress] [[hostIPaddr:]bootfilename]
我怎么能确定某个命令实际上是否会调用环境变量?