AT91SAM9 RTT as RTC
modulename: rtc-at91sam9.ko
configname: CONFIG_RTC_DRV_AT91SAM9
Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>Device Tree and Open Firmware support
└─>AT91SAM9 RTT as RTC
In linux kernel since version 2.6.25 (release Date: 2008-04-16)
Some AT91SAM9 SoCs provide an RTT (Real Time Timer) block which
can be used as an RTC thanks to the backup power supply (e.g. a
small coin cell battery) which keeps this block and the GPBR
(General Purpose Backup Registers) block powered when the device
is shutdown.
Some AT91SAM9 SoCs provide a real RTC block, on those ones you'd
probably want to use the real RTC block instead of the "RTT as an
RTC" driver.
can be used as an RTC thanks to the backup power supply (e.g. a
small coin cell battery) which keeps this block and the GPBR
(General Purpose Backup Registers) block powered when the device
is shutdown.
Some AT91SAM9 SoCs provide a real RTC block, on those ones you'd
probably want to use the real RTC block instead of the "RTT as an
RTC" driver.