RTC anti-rollback testing

[Mitch Bradley]

I traced the problem to a missing feature in the Embedded Controller 
firmware for XO-1 .http://dev.laptop.org/ticket/11347 .  Richard and I 
will work on it soon, during down time in our impending trip to Shanghai.


On 10/17/2011 2:11 AM, Esteban Bordón wrote:
> I've tried in 2 XO 1.0 and I have the same behaviour in both laptops.
> For each boot, the laptop repeats steps b and c, then, laptop powers 
> off. If XO have "rt" tag will never boot.
>
> 2011/10/14 Mitch Bradley <wmb at laptop.org <mailto:wmb at laptop.org>>
>
>     The most likely explanation is that OFW had to power off in order
>     to re-enable writing to the SPI FLASH.  That can happen if the
>     last reboot was from Linux.  See http://dev.laptop.org/ticket/4397
>
>     Unless that bug is fixed, the process will be:
>
>     a) Linux reboots
>     b) OFW runs rtc-rollback? and tries to write the new timestamp SPI
>     FLASH
>     c) OFW is unable to perform the write because SPI FLASH is locked
>     d) OFW reboots, using the EC command that unlocks SPI FLASH
>     e) OFW runs rtc-rollback? and sucessfully writes the new timestamp'
>
>     The net result is that reboots will take slightly longer when
>     anti-rollback is enabled.
>
>
>     On 10/14/2011 2:53 AM, Esteban Bordón wrote:
>>     2011/10/11 Esteban Bordón <ebordon at plan.ceibal.edu.uy
>>     <mailto:ebordon at plan.ceibal.edu.uy>>
>>
>>         Hi all,
>>
>>         I'm trying to test the RTCAR including on OFW Q2E46 by
>>         following the steps indicated in
>>         http://wiki.laptop.org/go/RTC_Anti-rollback#Testing_Rollback_Detection.
>>
>>         I added the "rt" tag, but when I run command
>>
>>         ok rtc-rollback? .
>>
>>         the laptop powers off.
>>
>>
>>
>>         Is it a normal behaviour?
>>
>>         cheers,
>>         Esteban
>>
>>
>>
>
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