3 real time clock (rtc) and watchdog timer (wdt) – Artesyn COMX-P40x0 ENP2 Installation and Use (January 2015) User Manual
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BSP
COMX-P40x0 ENP2 Installation and Use (6806800R95C)
114
brd me 00
brd ms 4096
brd md 'ComExpress module on P4080(1.5GHz)'
brd ma 'Emerson Network Power'
brd save
7.15.3 Real Time Clock (RTC) and Watchdog Timer (WDT)
The COMX-P40x0 ENP2 module uses RTC and Watchdog features on M41ST85W. The I2C
RTC/WDT M41ST85W (U12) is adopted on the COMX-P40x0 ENP2 and located on I2C<1>.
Boot up message in the U-Boot will be as follows: "RCT: M41ST85W@68" and "WDT:
M41ST85W@68(disabled)".
U-Boot provides "date" commands to operate the RTC features. These include get/set/reset
date and time.
The following are usage samples for "date" on the COMX-P40x0 ENP2.
date
Date: 2010-12-01 (Wednesday) Time: 17:57:37
date reset
Reset RTC
Date: 2010-18-01 (Sunday) Time: 0:00:00
date 120117592010.00
Date: 2010-12-01 (Wednesday) Time: 17:59:00
date [MMDDhhmm[[CC]YY][.ss]]
date reset
without arguments:
Prints date and time
with numeric argument:
Sets the system date and time
with ’reset’ argument:
Resets the RTC