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=> help tftpboot
tftpboot [loadAddress] [[hostIPaddr:]bootfilename]

=> help setenv printenv
setenv name value ...
    - set environment variable 'name' to 'value ...'
setenv name
    - delete environment variable 'name'

printenv
    - print values of all environment variables
printenv name ...
    - print value of environment variable 'name'

=>