> It annoys me that powerpc64 boot doesn't echo the 1st key; I type
> "bsd.rd" and see "boot> sd.rd".  This is because rdboot turns off ECHO
> while waiting 5 seconds for the 1st key.  (After 5 seconds, it times
> out and boots the default bsd.)
> 
> If I turn on ECHO, the 1st key echoes twice: "boot> bbsd.rd".
> 
> This diff works for me: getchar, putchar for echo, ungetc(3) before
> the next fgets(3).  There is a race where the serial port can try to
> type a 2nd key before rdboot turns on ECHO.  (I always typed by hand
> and never pasted a string.)  Even so, I guess that echoing 1 key is
> better than 0, then is this ok?

FWIW, I have noticed the same behaviour on Octeon. I am not sure whether
your diff is the right way to fix this, but if it does, the same diff
will need to be applied to sys/arch/octeon/stand/rdboot/cmd.c as well
(perhaps with a boot version update for both platforms).