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Charger BGATE is off on POR hence the voltage to the battery pack is not applied immediately from the VBUS. To overcome this issue, BGATE is turned on (CHG_EN) at charger initialization. If the voltage across VBATT is high but I2C is still failing, battery is booting from ship mode hence overwrite the battery as not present till I2C on battery is success and INIT bit is set. BUG=chrome-os-partner:59308 BRANCH=none TEST=Reef can boot to OS from shipmode battery. Change-Id: If1b212612e27fd65a822675a9609f0a8c03d8add Signed-off-by: Vijay Hiremath <vijay.p.hiremath@intel.com> Signed-off-by: Divya Sasidharan <divya.s.sasidharan@intel.com> Reviewed-on: https://chromium-review.googlesource.com/411360 Commit-Ready: Vijay P Hiremath <vijay.p.hiremath@intel.com> Tested-by: Vijay P Hiremath <vijay.p.hiremath@intel.com> Reviewed-by: Shawn N <shawnn@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly