[Bug 891] New: Don't power anything up if battery is critical and charger is inserted
bugzilla-daemon at bugzilla.openmoko.org
bugzilla-daemon at bugzilla.openmoko.org
Wed Sep 26 03:17:26 CEST 2007
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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