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[gentoo][embedded] время

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Устройство имеет rtc, но не имеет питания для rtc. Часы каждый раз обнуляются. В логе загрузки следующее.

 * Mounting proc at /proc ...                                             [ ok ]
 * Mounting sysfs at /sys ...                                             [ ok ]
 * Mounting /dev ...                                                      [ ok ]
 * Starting udevd ...                                                     [ ok ]
 * Populating /dev with existing devices through uevents ...              [ ok ]
 * Waiting for uevents to be processed ...                                [ ok ]
 * Mounting devpts at /dev/pts ...                                        [ ok ]
 * Checking root filesystem ...Reiserfs super block in block 16 on 0x5b000 of format 3.6 with standard journal
Blocks (total/free): 3148736/2951371 by 4096 bytes
Filesystem is clean
File system check timestamp is in the future. Checking now.
Filesystem seems mounted read-only. Skipping journal replay.
File system check timestamp is in the future. Checking now.
Checking internal tree.. finished
                                           [ ok ]
 * Remounting root filesystem read/write ...                              [ ok ]
 * Checking all filesystems ...                                           [ ok ]
 * Mounting local filesystems ...                                         [ ok ]
 * Activating (possible) swap ...                                         [ ok ]
 * Setting system clock using the hardware clock [Local Time] ...
 * hwclock: settimeofday() failed, errno=22: Invalid argument.
 * Failed to set clock You will need to set the clock yourself
                                                                          [ !! ]
 * Configuring kernel parameters ...Unknown HZ value! (83) Assume 100.
                                      [ ok ]
 * Cleaning /var/lock, /var/run ...Unknown HZ value! (82) Assume 100.
                                       [ ok ]
 * Wiping /tmp directory ...                                              [ ok ]
 * One of the files in /etc/{conf.d,init.d} or /etc/rc.conf
 * has a modification time in the future!
 * One of the files in /etc/{conf.d,init.d} or /etc/rc.conf
 * has a modification time in the future!
 * One of the files in /etc/{conf.d,init.d} or /etc/rc.conf
 * has a modification time in the future!
 * One of the files in /etc/{conf.d,init.d} or /etc/rc.conf
 * has a modification time in the future!
...

Думаю надо сохранять время в файл, а когда будет доступна сеть использовать ntp. Вопрос в том есть ли, что нибудь готовое для этого? или мне самому переписывать /etc/init.d/clock ?

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