[Bug 891] New: Don't power anything up if battery is critical and charger is inserted

[bugzilla-daemon at bugzilla.openmoko.org]

http://bugzilla.openmoko.org/cgi-bin/bugzilla/show_bug.cgi?id=891

           Summary: Don't power anything up if battery is critical and
                    charger is inserted
           Product: OpenMoko
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: u-boot
        AssignedTo: laforge at openmoko.org
        ReportedBy: cesarb at cesarb.net
                CC: buglog at lists.openmoko.org


If the battery charge is too low, doing things like powering up the backlight is
counterproductive (if things are really critical, it could make the voltage sag
enough that the CPU loses power, causing a reset cycle). This could be the cause
for reports of repeated backlight flashing when trying to recharge dead batteries.

If the powerup cause is reset or charger insert, AND the battery level is too
low (below some threshold voltage), u-boot should detect the situation at the
earliest possible time (perhaps even before powering up the SDRAM) and refrain
from powering up anything else (perhaps even powering down the CPU, or making it
use the least possible amount of power while slowly polling the battery status).
This would give the charger time to bring the battery voltage back to a
comfortable level.



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