On 06/11/2014 11:58 PM, John Syn wrote:
From: Justin Morgan <jdm...@gmail.com <mailto:jdm...@gmail.com>>
Reply-To: <beagleboard@googlegroups.com
<mailto:beagleboard@googlegroups.com>>
Date: Wednesday, June 11, 2014 at 7:54 PM
To: <beagleboard@googlegroups.com <mailto:beagleboard@googlegroups.com>>
Subject: [beagleboard] When and where is Is Debian 7.5 2014-05-14
synchronizing omap_rtc with the system clock?
I have installed the Debian 7.5 2014-05-14 image onto my
BeagleBone Black. Very early in the boot process, Debian appears
to synchronize (or attempt thereof) the time reported by
the omap_rtc device (that would be the RTC built into the AM3359
processor that gets mapped to /dev/rtc0). This can be demonstrated
by the following line in dmsg:
[ 1.025090] omap_rtc 44e3e000.rtc: setting system clock to
2000-01-01 00:00:00 UTC (946684800)
I am trying to determine exactly when and where the event that
logs *this* dmesg entry happens in the boot process.
You need to change "CONFIG_RTC_HCTOSYS_DEVICE" to rtc1 in your kernel
.config file.
Regards,
John
--
This will get the kernel to use rtc1. I'm unable to verify it right
now, but one will have to make sure the proper module is loaded if
required. You will also have to disable hwclock in systemd or it's
going to reset the time back to whatever rtc0 thinks the time is.
The systemd authors have chosen to rewrite hwclock and the rtc0 value is
hardcoded into the binary. There also is *NO* way to change the rtc
used in their version as in the original version of hwclock.
I've been beating my head against the wall on this for some time now.
When I'm able to get my BBB plugged in again and get a bit of spare time
I dig into it more again.
Mike
--
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 beagleboard+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
