Re: Allwinner RTC

["Jonathan A. Kollasch" <jakllsch%kollasch.net@localhost>]

On Fri, Nov 07, 2014 at 08:33:49AM -0600, Jonathan A. Kollasch wrote:
> 
> Currently whenever I boot NetBSD on my Cubietruck after booting the
> Android system in NAND the clock is exactly 70 years in the future.
> 
> I've looked at the linux-sunxi/drivers/rtc/rtc-sun4i.c code and it
> appears than all RTCs supported by rtc-sun4i except the sun7i (A20)
> implement a 63-year RTC based at 1970.  The sun7i uses a 255-year RTC
> register layout and is based at 1900.
> 
> Comparing this to src/sys/arch/arm/allwinner/awin_rtc.c v1.6, I seem to
> find that we only do as Linux on the A30 chips.
> 
> Does anyone have Linux/Android booting on a A10-based system to confirm
> that it uses the 63-year 1970-based RTC?  I believe you would find that
> that NetBSD would think it was 70 years earlier than Linux on A10.

Looking at the A10 User Manual, it seems to indicate it has a 63-year RTC.

	Jonathan Kollasch