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CONFIG_RTC: Enhanced Real Time Clock Support (legacy PC RTC driver)

General informations

The Linux kernel configuration item CONFIG_RTC has multiple definitions:

Enhanced Real Time Clock Support (legacy PC RTC driver) found in drivers/char/Kconfig

The configuration item CONFIG_RTC:

Help text

If you say Y here and create a character special file /dev/rtc with major number 10 and minor number 135 using mknod ("man mknod"), you will get access to the real time clock (or hardware clock) built into your computer.

Every PC has such a clock built in. It can be used to generate signals from as low as 1Hz up to 8192Hz, and can also be used as a 24 hour alarm. It reports status information via the file /proc/driver/rtc and its behaviour is set by various ioctls on /dev/rtc.

If you run Linux on a multiprocessor machine and said Y to "Symmetric Multi Processing" above, you should say Y here to read and set the RTC in an SMP compatible fashion.

If you think you have a use for such a device (such as periodic data sampling), then say Y here, and read Documentation/admin-guide/rtc.rst for details.

To compile this driver as a module, choose M here: the module will be called rtc.

Enhanced Real Time Clock Support found in drivers/char/Kconfig

The configuration item CONFIG_RTC:

Help text

If you say Y here and create a character special file /dev/rtc with major number 10 and minor number 135 using mknod ("man mknod"), you will get access to the real time clock (or hardware clock) built into your computer.

Every PC has such a clock built in. It can be used to generate signals from as low as 1Hz up to 8192Hz, and can also be used as a 24 hour alarm. It reports status information via the file /proc/driver/rtc and its behaviour is set by various ioctls on /dev/rtc.

If you run Linux on a multiprocessor machine and said Y to "Symmetric Multi Processing" above, you should say Y here to read and set the RTC in an SMP compatible fashion.

If you think you have a use for such a device (such as periodic data sampling), then say Y here, and read Documentation/rtc.txt for details.

To compile this driver as a module, choose M here: the module will be called rtc.

PC-style Real Time Clock Support found in drivers/sbus/char/Kconfig

The configuration item CONFIG_RTC:

Help text

(none)

found in arch/sparc64/Kconfig

The configuration item CONFIG_RTC:

Help text

If you say Y here and create a character special file /dev/rtc with major number 10 and minor number 135 using mknod ("man mknod"), you will get access to the real time clock (or hardware clock) built into your computer.

Every PC has such a clock built in. It can be used to generate signals from as low as 1Hz up to 8192Hz, and can also be used as a 24 hour alarm. It reports status information via the file /proc/driver/rtc and its behaviour is set by various ioctls on /dev/rtc.

If you run Linux on a multiprocessor machine and said Y to "Symmetric Multi Processing" above, you should say Y here to read and set the RTC in an SMP compatible fashion.

If you think you have a use for such a device (such as periodic data sampling), then say Y here, and read Documentation/rtc.txt for details.

To compile this driver as a module, choose M here: the module will be called rtc.

Enhanced Real Time Clock Support found in arch/sh/Kconfig

The configuration item CONFIG_RTC:

Help text

If you say Y here and create a character special file /dev/rtc with major number 10 and minor number 135 using mknod ("man mknod"), you will get access to the real time clock (or hardware clock) built into your computer.

Every PC has such a clock built in. It can be used to generate signals from as low as 1Hz up to 8192Hz, and can also be used as a 24 hour alarm. It reports status information via the file /proc/driver/rtc and its behaviour is set by various ioctls on /dev/rtc.

If you run Linux on a multiprocessor machine and said Y to "Symmetric Multi Processing" above, you should say Y here to read and set the RTC in an SMP compatible fashion.

If you think you have a use for such a device (such as periodic data sampling), then say Y here, and read Documentation/rtc.txt for details.

To compile this driver as a module, choose M here: the module will be called rtc.

Enhanced Real Time Clock Support found in arch/m68k/Kconfig

The configuration item CONFIG_RTC:

Help text

If you say Y here and create a character special file /dev/rtc with major number 10 and minor number 135 using mknod ("man mknod"), you will get access to the real time clock (or hardware clock) built into your computer.

Every PC has such a clock built in. It can be used to generate signals from as low as 1Hz up to 8192Hz, and can also be used as a 24 hour alarm. It reports status information via the file /proc/driver/rtc and its behaviour is set by various ioctls on /dev/rtc.

If you run Linux on a multiprocessor machine and said Y to "Symmetric Multi Processing" above, you should say Y here to read and set the RTC in an SMP compatible fashion.

If you think you have a use for such a device (such as periodic data sampling), then say Y here, and read Documentation/rtc.txt for details.

This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called rtc. If you want to compile it as a module, say M here and read Documentation/modules.txt.

Enhanced Real Time Clock Support found in arch/mips/Kconfig

The configuration item CONFIG_RTC:

Help text

(none)

Hardware

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