2013/6/11 Paul Hartman <paul.hartman+gentoo@gmail.com>

> On Mon, Jun 10, 2013 at 7:31 PM, walt <w41ter@gmail.com> wrote:
> > After the recent 3.9 --> 3.10 kernel merge window, udev no longer creates
> > /dev/rtc (or /dev/rtc0) during bootup on my ~amd64 machines. (The only
> > machines I have now.)
>
> Not a git-kernel nerd, but just an ordinary kernel nerd. :)
>
> The kernel RTC driver creates /dev/rtc0 and then I assume udev creates
> /dev/rtc from there, so if you are missing rtc0 that's a possible
> source of the problem. Which would coincide with your kernel upgrade.
>
> I know 3.9 introduced a couple new RTC-related option so maybe it
> changed around some more to 3.10 series. I would run menuconfig and
> see what it thinks you have enabled in that section, just in case
> something got lost in transition from one kernel to the next.
>
> In dmesg on my non-git 3.9.4 kernel it looks like:
>
> [    1.237994] rtc_cmos 00:04: RTC can wake from S4
> [    1.238158] rtc_cmos 00:04: rtc core: registered rtc_cmos as rtc0
> [    1.238177] rtc_cmos 00:04: alarms up to one month, y3k, 114 bytes
> nvram, hpet irqs
> [    1.241101] rtc_cmos 00:04: setting system clock to 2013-06-04
> 04:28:34 UTC (1370320114)
>
> I'm using the "PC-Style CMOS" RTC driver, and I have all of the
> RTC-related options enabled except for the debugging options.
>
>

I'm using gentoo-sources-3.8.13 - out of your scope, though, but I have
recently faced the same issue.

I rebuilt the kernel using "--menuconfig", to make sure that all RTC
options were enabled.  It works, now.

Good luck
Francisco