rock rv1126buildroot增加ntp过程

1 在buildroot中添加

切换到rv1126_rv1109_20210616/buildroot/output/rockchip_rv1126_rv1109$

make ntp-reconfigure
make ntp-rebuild

这里就会把ntpd 安装到target 文件系统里面

然后再上层路径使用build.sh 生产update.img 重新将这个写入到板子上

开启系统后

修改配置文件/etc/ntp.conf

修改时区为上海

cp -f /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

手动启动

ntpd -g

在ntp服务端 使用抓包查看

tcpdump port 123 -vvv

问题解决
更新时间宽度过大时只允许修改一次
这个是ntpd -g 这个参数指定的 原文是

ntpd - NTP daemon program - Ver. 4.2.8p10
Usage:  ntpd [ -<flag> [<val>] | --<name>[{=| }<val>] ]... \
		[ <server1> ... <serverN> ]
  Flg Arg Option-Name    Description
   -4 no  ipv4           Force IPv4 DNS name resolution
				- prohibits the option 'ipv6'
   -6 no  ipv6           Force IPv6 DNS name resolution
				- prohibits the option 'ipv4'
   -a no  authreq        Require crypto authentication
				- prohibits the option 'authnoreq'
   -A no  authnoreq      Do not require crypto authentication
				- prohibits the option 'authreq'
   -b no  bcastsync      Allow us to sync to broadcast servers
   -c Str configfile     configuration file name
   -d no  debug-level    Increase debug verbosity level
				- may appear multiple times
   -D Num set-debug-level Set the debug verbosity level
				- may appear multiple times
   -f Str driftfile      frequency drift file name
   -g no  panicgate      Allow the first adjustment to be Big
				- may appear multiple times
   -G no  force-step-once Step any initial offset correction.
   -i --- jaildir        built without --enable-clockctl or --enable-linuxcaps or --enable-solarisprivs
   -I Str interface      Listen on an interface name or address
				- may appear multiple times
   -k Str keyfile        path to symmetric keys
   -l Str logfile        path to the log file
   -L no  novirtualips   Do not listen to virtual interfaces
   -n no  nofork         Do not fork
				- prohibits the option 'wait-sync'
   -N no  nice           Run at high priority
   -p Str pidfile        path to the PID file
   -P Num priority       Process priority
   -q no  quit           Set the time and quit
				- prohibits these options:
				saveconfigquit
				wait-sync
   -r Str propagationdelay Broadcast/propagation delay
      Str saveconfigquit Save parsed configuration and quit
				- prohibits these options:
				quit
				wait-sync
   -s Str statsdir       Statistics file location
   -t Str trustedkey     Trusted key number
				- may appear multiple times
   -u --- user           built without --enable-clockctl or --enable-linuxcaps or --enable-solarisprivs
   -U Num updateinterval interval in seconds between scans for new or dropped interfaces
      Str var            make ARG an ntp variable (RW)
				- may appear multiple times
      Str dvar           make ARG an ntp variable (RW|DEF)
				- may appear multiple times
   -w Num wait-sync      Seconds to wait for first clock sync
				- prohibits these options:
				nofork
				quit
				saveconfigquit
   -x no  slew           Slew up to 600 seconds
   -m no  mdns           Register with mDNS as a NTP server
      opt version        output version information and exit
   -? no  help           display extended usage information and exit
   -! no  more-help      extended usage information passed thru pager

Options are specified by doubled hyphens and their name or by a single
hyphen and the flag character.


The following option preset mechanisms are supported:
 - examining environment variables named NTPD_*

Please send bug reports to:  <http://bugs.ntp.org, bugs@ntp.org>

在 /etc/init.d/S49ntp 这个可执行文件

/etc/init.d/S49ntp stop
/etc/init.d/S49ntp start

即可在不关机重启的状态下更新系统时间

2 手动将可执行文件拷贝进去

在别得地方交叉编译好的可执行文件ntpd
S49ntp启动文件
分别拷贝到

• /usr/sbin/ntpd
• /ec/init.d/S49ntp