|To use SNTP support, add a define CFG_CMD_SNTP to CONFIG_COMMANDS in
|the configuration file of the board.
|The "sntp" command gets network time from NTP time server and
|syncronize RTC of the board. This command needs the command line
|parameter of server's IP address or environment variable
|"ntpserverip". The network time is sent as UTC. So if you want to
|set local time to RTC, set the offset in second from UTC to the
|enviroment variable "time offset".
|If the DHCP server provides time server's IP or time offset, you
|don't need to set the above environment variables yourself.
|Current limitations of SNTP support:
|1. The roundtrip time is ignored.
|2. Only the 1st NTP server IP, in the option ntp-servers of DHCP, will
| be used.