Openmoko Bug #1698: [E-illume bar] time will changing after take off battery.
Openmoko Public Trac
bugs at docs.openmoko.org
Fri Sep 5 16:14:03 CEST 2008
#1698: [E-illume bar] time will changing after take off battery.
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Reporter: regina_kim | Owner: andy
Type: defect | Status: assigned
Priority: high | Milestone: Om2008.9
Component: System Software | Version:
Severity: critical | Resolution:
Keywords: | Blockedby:
Reproducible: | Blocking:
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Comment(by werner):
I tried to reproduce it, but I seem to get the correct time.
My test procedure:
- connect USB and battery power
- connect the debug board
- reset and enter u-boot via the serial console
- obtain the time with "date" or "imd 73 59 7".
Example:
GTA02v5 # imd 73 59 7;date
0059: 27 13 10 05 05 05 08 '......
Date: 2008-05-05 (Friday) Time: 10:13:27
- display time on Neo and PC:
Date: 2008-05-05 (Friday) Time: 10:14:56
Fri Sep 5 10:14:52 ART 2008
(Neo = PC+4s)
- hardware reset from the debug board, then display time
Date: 2008-05-05 (Friday) Time: 10:16:45
Fri Sep 5 10:16:41 ART 2008
(Neo = PC+4s, as before)
- turn off battery power for ~5s, power on with POWER button,
then display time
Date: 2008-05-05 (Friday) Time: 10:19:05
Fri Sep 5 10:19:01 ART 2008
(Neo = PC+4s)
- remove USB, then turn off battery power for ~5s, re-apply battery
power, then insert USB
Date: 2008-05-05 (Friday) Time: 10:21:39
Fri Sep 5 10:21:35 ART 2008
(Neo = PC+4s)
- detach all power, including debug board for some 40 minutes
- backup battery voltage is 1.66V
- powered on by attaching debug board, battery, then USB
Date: 2008-05-05 (Friday) Time: 11:09:45
Fri Sep 5 11:09:40 ART 2008
(Neo = PC+5s)
So the RTC hardware seems to be stable within the bounds of measurement
errors.
Can anyone who experienced this problem please try and see if it can also
be
reproduced it in u-boot ? Also, which hardware was used ? If possible, a
measurement of the backup battery voltage would be great as well.
Thanks,
- Werner
--
Ticket URL: <https://docs.openmoko.org/trac/ticket/1698#comment:11>
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