u-boot/doc/README.SNTP
wdenk ea287debe1 * Patch by Masami Komiya, 30 Mar 2005:
add SNTP support and expand time server and time offset fields of
  DHCP support. See doc/README.SNTP

* Patch by Steven Scholz, 13 Dec 2004:
  Fix bug in at91rm920 ethernet driver
2005-04-01 00:25:43 +00:00

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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.