RTC anti-rollback testing
wmb at laptop.org
Mon Oct 17 15:27:31 EDT 2011
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
> 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
>> I added the "rt" tag, but when I run command
>> ok rtc-rollback? .
>> the laptop powers off.
>> Is it a normal behaviour?
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