As can be seen from the kernel boot log there are actually 3 RTC drivers active on Tegra K1 based modules:. The second one is Vybrid SoC internal. The third one is Tegra SoC internal and won’t keep the time across power-cycles in our design. The second one is Tegra SoC internal and won’t keep the time across power-cycles in our design. The second one is i. Not all RTC support this wake up mode, check the availability of the wakealarm file. If internet connection is provided, the systemd-timesyncd service will automatically synchronize the local system clock with a remote Network Time Protocol server and the systemd-timedated service will make sure the new system clock is synchronized with the hardware clock RTC immediately.

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For more information refer to the timedatectl manual page at freedesktop. As can be seen from the kernel boot log there are actually 3 RTC drivers active on Tegra K1 based modules:.

To let one of the RTCs retain the time even when no power is applied to the system, put a backup battery in the respective holder on the carrier board. Not all RTC support this wake up mode, check the availability of the wakealarm file. You can display the current time, set a lonux clock to a specified time, set a hardware clock to the system time, and set the system dds1307 from the hardware clock. How to use the Real Time Clock in Linux.

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linhx Two clocks are important in Linux: Linuux that point onward the system clock is used to track time. Use the hwclock command after entering the date command to synchronize an RTC with the updated system time:. Setting the system time using the date command does not automatically synchronize the RTCs.

Alternatively, there is the tool hwclock for accessing one of the hardware clocks directly. MX6 ULL based modules:. The second one is Vybrid SoC internal.

Adafruit: RTC DS –

When using the timedatectl utility, the time will get stored into the hardware clock immediately when setting a new date or time. This is the battery backed clock that keeps time even when the system is shut down.

The third one is PMIC integrated usually drawing much more current that the first dedicated one. The timedatectl allows to display the current time, both, the system clock and the hardware clock. To change the default RTC as e.

The second one is Tegra SoC internal and won’t lonux the time across power-cycles in our design. Furthermore, it also displays the currently configured time zone of the system which is UTC by default in our images. The system clock will not get stored into the hardware clock on shutdown. If internet connection is provided, the systemd-timesyncd service will automatically synchronize the local system clock with a remote Network Time Protocol server and the systemd-timedated service will make sure the new system clock is synchronized with the hardware clock RTC immediately.

Our images use systemd-timedated and the timedatectl command since V2. As can be seen from the kernel boot log there are 2 RTC drivers active on i. The first one is the ultra low-power RTC available on the carrier board.

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Adafruit: RTC DS1307

If no internet connection is provided, timedatectl can be used to set the date or time and the systemd-timedated service will make sure the new system clock is synchronized with the hardware clock RTC immediately:. When in sleep mode, a RTC can be used to wake the system up later.

The first one is the PMIC integrated usually drawing much more current that the one from the carrier board. As can be seen from the kernel boot log there are actually 3 RTC drivers active on Tegra based modules:.

The second one is the ultra low-power RTC available on the carrier board. As can be seen from the kernel boot log there are actually 2 Ds307 drivers active on Vybrid based modules:. The third one is Tegra SoC internal and won’t keep the time across power-cycles in our design. At boot time, the hardware clock is read and used to set the system clock. The second one is i. Traditionally, on power off, the system clock will get stored into the hardware clock by a shutdown script.

Last modified: February 7, 2020