Better characterization of suspend current
Neng-Yu Tu (Tony Tu)
tony at openmoko.com
Tue Feb 12 11:35:28 CET 2008
>>> Yes. The system would be shutdown immediately when the battery is about
>>> 3v3. I think we could add some detecting and handling at u-boot to avoid
>>> booting up when system tends less voltage.
> A problem here could that if we read -- and clear -- the PMU INT# stuff
> in U-Boot (to get LOWBAT) the general coldplug actions driven by
> inheriting the INT# bits will be broken in Linux. Well with the
> patchset I sent yesterday we take care of it in early Linux boot anyway
> and shut down in that condition.
Currently we measure the voltage from battery directly. If using coulomb
counter battery, we should get the reading from battery itself.
Currently battery do not set any parameter yet, so the reading might be
But eventually, we should read the parameter directly from the battery
>> be arrived at from these measurements, and we need to check that
>> lifetime on a real phone actually left in standby until it flakes out.
>>> It sounds great. I will let HW people to know this suggestion and to
>>> see any possibilities to have this observation.
> - -Andy
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