Disclaimer: I'm working on a new project here, so I'm not 100% up-to-date on the system as a whole.
I've been tasked to find out why our RTC clock is not being updated after suynching with a NTP timesource. In our previous release, the RTC seemed to be updated every 11 minutes via the timer_interrupt() ISR. This no longer seems to be happening. I have determined that timer_isr() is running, but ppc_md.set_rtc_time(xtime.tv_sec+1 + timezone_offset) doesn't appear to ever get called. There are five conditions that must be true for this to be called: 1 - ppc_md.set_rtc_time this is true. 2 - ntp_synced() this seems to become true as soon as I sync with my NTP timesource. 3 - xtime.tv_sec - last_rtc_update >= 659 this seems to become true within a few secondws of syncing with my timesource 4 - abs((xtime.tv_nsec / 1000) - (1000000-1000000/HZ)) < 500000/HZ this seems to be true fairly often 5 - jiffies - wall_jiffies == 1 This seems to be true fairly often. My checks for these conditions are pretty crude. If one is true, I go into an infinite loop, which eventually kicks off the watchdog timer and the card reboots. Quick & dirty. #1 #2, and #3 seem pretty obvious. #1 checks for the presence of a time sync function, #2 checks to see if we have synchronized with an NTP server, and #3 checks to see of that sync was at least 11 minutes ago. #4 and #5 I don't understand so much. I THINK #4 checks to see of we're close to a second or half-second boundry (I'm assuming this is becxause of a hardware limitation on the RTC.) #5 I have no clue about. It seems that wall_jiffies and jiffies are always the same. My goal is simply to sync the RTC with the system clock, either periodically or at system shutdown (which is preferred.) however, I don't have an RTC driver. Neither do I have hwclock on this system, so my first shot was getting the 11-minute update working. If this is the wrong way to go, I'm open to suggestions. -- Robert King Sevis Systems, Inc. ##################################################################################### This e-mail message has been scanned for Viruses and Content and cleared by MailMarshal ##################################################################################### _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
