On Fri, Aug 19, 2011 at 2:07 PM, john stultz [off-list ref] wrote:

On Fri, 2011-08-19 at 00:16 -0400, Matt Turner wrote:

quoted

Hi John,

I just sent a patch series to linux-mips@ that enables the RTC on a
particular Broadcom MIPS motherboard (BCM91250A SWARM). The RTC is an
M41T80.

When I first found the patchset (it was originally sent a a few years
ago) and applied it to 2.6.37, it worked perfectly.

Applied to 3.x (and I think even 2.6.38) I get the following when I run hwclock:

# hwclock --systohc
select() to /dev/rtc0 to wait for clock tick timed out

So do alarm interrupts actually work on the hardware?

The rtc-m41t80.c driver looks like it should support them ok.

Does the test program at the end of Documentation/rtc.txt do much?

thanks
-john

Counting 5 update (1/sec) interrupts from reading /dev/rtc0:

... and then it doesn't count.

Would it help if I tried to bisect this? (Is there an easy way to
bisect 2.6.37..master with my patches applied to each iteration?)

Thanks,
Matt