You could write a udev rule to make your RTC symlink to /dev/rtc0
On Thu, Jun 12, 2014 at 11:24 PM, Alexander Holler <[email protected]> wrote: > Am 13.06.2014 05:01, schrieb Robert Nelson: > > On Thu, Jun 12, 2014 at 9:56 PM, Justin Morgan <[email protected]> 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 [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- 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]. For more options, visit https://groups.google.com/d/optout.
