[yocto] [PATCH 0/1] Enable to set RTC for beagleboard

[Koen Kooi]

Op 16 jun 2011, om 16:45 heeft Darren Hart het volgende geschreven:

> 
> On 06/15/2011 09:25 PM, Bruce Ashfield wrote:
>> On 11-06-15 10:23 PM, Lu Jingdong wrote:
>>> On 06/16/2011 01:33 AM, Darren Hart wrote:
>>>> 
>>>> On 06/15/2011 09:52 AM, Bruce Ashfield wrote:
>>>>> On 06/15/11 12:48, Darren Hart wrote:
>>>>>> 
>>>>>> On 06/15/2011 06:31 AM, Bruce Ashfield wrote:
>>>>>>> On 06/15/11 09:25, Koen Kooi wrote:
>>>>>>>> Op 15 jun 2011, om 15:21 heeft Bruce Ashfield het volgende
>>>>>>>> geschreven:
>>>>>>>> 
>>>>>>>>> On 06/15/11 06:41, Jingdong Lu wrote:
>>>>>>>>>> From: Jingdong Lu<jingdong.lu at windriver.com>
>>>>>>>>>> 
>>>>>>>>>> Ensure msecure is mux'd to be able to set the RTC for
>>>>>>>>>> beagleboard. Fixes bug [YOCTO #767]
>>>>>>>>> Jingdong,
>>>>>>>>> 
>>>>>>>>> The fix looks reasonable to me, Darren has been refreshing the
>>>>>>>>> beagleboard support as well, so I've cc'd him here to see if we
>>>>>>>>> have this change present in the work in progress trees.
>>>>>>>>> 
>>>>>> 
>>>>>> I do not have something similar queued.
>>>>>> 
>>>>>> 
>>>>>>>>> What tests did you run to ensure that the RTC worked on the
>>>>>>>>> beagleboard ? There was some debate around whether or not you
>>>>>>>>> needed an add-on card to get this functionality available ?
>>> The signal "msecure" on TPS65950 connects to "msecure" on OMAP3530 and
>>> setting/writing RTC register is controlled by
>>> OMAP3530 "msecure". So we should pull the "msecure" high on OMAP3530 so
>>> that we can set/write RTC register on TPS65950.
>>> 
>>> We test RTC on beagleboard by adding this patch. RTC can be set a
>>> correct date and
>>> it works well when power on.
>>>>>>>> You need to remove some resistors and add a battery, or add an
>>>>>>>> expansionboard like the zippy or zippy2, which have a DS1307 RTC
>>>>>>>> with battery.
>>> Because there is no backup battery on beagleboard C4, RTC can not be
>>> saved when
>>> power off. If we want to keep RTC without power, we should remove R66
>>> and install
>>> a battery on board.
>> 
>> Ack'd. For me, this is reasonable. Having a working RTC even
>> if it doesn't survive power cycle is worth having. In particular,
>> since the patch is simple.
> 
> 
> Agreed.

FWIW, it survives warm resests.

regards,

Koen