Re: select() to /dev/rtc0 to wait for clock tick timed out

linux-mips

Re: select() to /dev/rtc0 to wait for clock tick timed out

To:	Matt Turner <mattst88@gmail.com>
Subject:	Re: select() to /dev/rtc0 to wait for clock tick timed out
From:	john stultz <johnstul@us.ibm.com>
Date:	Fri, 19 Aug 2011 11:07:22 -0700
Cc:	linux-mips@linux-mips.org
In-reply-to:	<CAEdQ38HGfd9YWE+WLuirE4Km6UE6N26toTj=-1BuXAQUux6t5g@mail.gmail.com>
References:	<CAEdQ38HGfd9YWE+WLuirE4Km6UE6N26toTj=-1BuXAQUux6t5g@mail.gmail.com>
Sender:	linux-mips-bounce@linux-mips.org

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

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