Am 13.06.2014 05:01, schrieb Robert Nelson: > On Thu, Jun 12, 2014 at 9:56 PM, Justin Morgan <jdm...@gmail.com> wrote: >> I've noticed a difference in behavior between the latest Angstrom Linux >> image and the latest Debian image available for the BeagleBone Black when it >> comes to enumerating the real-time clocks present when a RTC "Cape" is >> "present". [I have the actual clock present by use of a generic breakout >> board, but not the actual cape.] >> >> I am trying to determine if Angstrom Linux has a patch that is not present >> in Debian, as I prefer the RTC behavior I am seeing in Angstrom. (I'd think >> Debian would want the Angstrom behavior, because if the user has attached an >> RTC, then there is most likely a battery backing it; the BBB currently does >> not support shutdown to the RTC rail only, so the on-board RTC is going to >> be wrong on a cold boot.) >> >> When I tell Angstrom that I have a "BB-BONE-RTC" cape attached, my RTC (the >> DS1307) is enumerated as /dev/rtc0. As such, my clock becomes the clock that >> is used to set the system clock, and is otherwise going to get all of the >> privileges of being the first RTC. >> >> When I tell Debian that I have a "BBB-RTC-01" cape attached, the on-board >> RTC is still enumerated as /dev/rtc0. My RTC is enumerated as /dev/rtc1. As >> such, the clock is wrong on boot. >> >> I used different capes because I was going for firmware already on the BBB. >> I don't see anything about either DTO that explains the difference in >> behavior. > > Well, i just compared Angstrom's config with the one i've been pushing > out for our 3.8 branch.. No difference an any "RTC" config's.. > > Probally comes down to Angstrom's much newer version of systemd, or > something custom.
You might have an interest in 3 old patches from me I've just posted again for someone else: https://lkml.org/lkml/2014/6/13/6 These patches make it possible to choose the used RTC by driver name. Regards, Alexander Holler -- 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.
