On Thu, Sep 14, 2017 at 11:50 AM, Robert Nelson <[email protected]> wrote: > On Thu, Sep 14, 2017 at 12:59 AM, <[email protected]> wrote: >> Hello, >> I have intefaced RTC DS1307 with Beaglbone. However, after the beaglebone >> boots up, its time is reset and RTC takes this reset time. Use of NTP would >> not be feasible since Beaglebone would be used in a remote location with no >> internet connection. What would be the solution to this issue ? > > As of this week, we have an easy solution. (using u-boot overlays of > course), the trick is the rtc "aliases", so that the ds1307 gets rtc0 > > Seee either : > > https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-I2C1-MCP7940X-00A0.dts > > or: > > https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-I2C2-PCF8523-00A0.dts
and here's it working: (eth is disconnected) debian@beaglebone:~$ dmesg | grep rtc [ 1.594096] omap_rtc 44e3e000.rtc: already running [ 1.594335] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as rtc1 [ 1.776976] rtc-ds1307 1-0068: registered as rtc0 [ 1.795900] rtc-ds1307 1-0068: setting system clock to 2017-09-14 17:01:12 UTC (1505408472) Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYjZ3hbMsv7QUYw0A3TtKYr-dmEGENJa5U9kDzYomr4QBQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
