[rtc-linux] Synchronization system time to rtc in Linux

[rtc-linux] Synchronization system time to rtc in Linux

[Hao Nguyen]

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Hi everyone,
We're working on our custom board running Linux kernel v2.6.37.

Our board uses CBC34803 chip cho real time function. Everything is ok 
except a problem.
The problem is when i change system time using "date" command with option 
'-s', time doesn't automatically update to RTC CBC34803.
My question:  which is responsible for update system time to rtc whenever 
the system time changes?
Thanks you for your reading, hope to hear some answer!!

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Re: [rtc-linux] Synchronization system time to rtc in Linux

[Alexandre Belloni]

Hi,

On 17/09/2015 at 21:07:19 -0700, Hao Nguyen wrote :
> We're working on our custom board running Linux kernel v2.6.37.
> 
> Our board uses CBC34803 chip cho real time function. Everything is ok 
> except a problem.
> The problem is when i change system time using "date" command with option 
> '-s', time doesn't automatically update to RTC CBC34803.
> My question:  which is responsible for update system time to rtc whenever 
> the system time changes?

hwclock is the tool you are looking for.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

Re: [rtc-linux] Synchronization system time to rtc in Linux

[Hao Nguyen]

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Hi Alexandre Belloni,
I know that hwclock can sync the system time to rtc with option -w.
But eveytime i change the system time, i need to use command "hwclock -w" 
to update time to rtc.
I want the synchronization can be done automatically. This mean, everytime 
i change the system time by "date" command, the time is updated to rtc 
automatically.

Do you have any idea for this? Does linux support this?

On Monday, September 21, 2015 at 3:39:08 AM UTC+7, Alexandre Belloni wrote:
>
> Hi, 
>
> On 17/09/2015 at 21:07:19 -0700, Hao Nguyen wrote : 
> > We're working on our custom board running Linux kernel v2.6.37. 
> > 
> > Our board uses CBC34803 chip cho real time function. Everything is ok 
> > except a problem. 
> > The problem is when i change system time using "date" command with 
> option 
> > '-s', time doesn't automatically update to RTC CBC34803. 
> > My question:  which is responsible for update system time to rtc 
> whenever 
> > the system time changes? 
>
> hwclock is the tool you are looking for. 
>
> -- 
> Alexandre Belloni, Free Electrons 
> Embedded Linux, Kernel and Android engineering 
> http://free-electrons.com 
>

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