I'm Qi Huang, changed to a new mailbox to avoid messing massge in mail titile.

>   If isconsole is set and TERMIOS is not, then it will always echo the
>   input.  The CR-LF  behavior only depends on isconsole and can't be
>   changed even if TERMIOS is enabled.

If TERMIOS enabled, the CR-LF behavior only determined by ifags/oflags in 
termios' setting, it can be changed even if isconsole is set.

>  The ECHO behavior can be disabled ONLY if TERMIOS are enabled.
>  TERIMIOS is now required by POSIX and, further, if TERMIOS is not
>  system, many features are now broken.  Like hiding the password when
>  logging into NSH.

Yes maybe we should select TERMIOS if some features really need it ? Most apps 
don't need it, only
termcurse/nsh login rely on it now in my known.

>  I have never seen that behavior.  That bug is probably introduced recently.

I see the echo by telnet can be disabled by special command and it sended, but 
it don't works now.

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