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authorwdenk <wdenk>2005-04-01 00:25:43 +0000
committerwdenk <wdenk>2005-04-01 00:25:43 +0000
commitea287debe1980182adbe8c63b71bb82193dad5b7 (patch)
tree34044b91763e6e85704b7a54acd34c042931461d /doc
parentef2807c667a91135fbb91b805b852ccfbff03587 (diff)
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* 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
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diff --git a/doc/README.SNTP b/doc/README.SNTP
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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.