[U-Boot] Automatic starting of netconsole at boot

[U.Mutlu]

I think there is a bug in netconsole of u-boot:
about every 8 seconds it pauses for about another 8 seconds.

Ie. some of the pressed keys on the netconsole host get struck (gets lost), 
after a while it continues.
Happens with "tools/netconsole" as well with "nc -u -l -p 6666".

This can also be seen from another terminal when pinging the device:
every a while (~ every 8 seconds) the output of ping pauses for about 8 seconds...