On Mon, Sep 18, 2017 at 7:13 AM, Tarmo Kuuse <[email protected]> wrote: > On Thursday, 14 September 2017 20:03:50 UTC+3, RobertCNelson wrote: >> >> 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/ > > > Very interesting. Which version of the kernel implements this?
Right now v4.9.x+ only, still need to look into backporting the change that enabled the rtc alisas to work.. 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/CAOCHtYgXr7oPx%2Btb9QCN3Ui3uUGzahYTSY8fvt3axjtttHrmAw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
