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Zephyr EC AP Power Requirements

[TOC]

Overview

AP power configures the minimum amount of power needed to boot the Application Processor.

Kconfig Options

The Kconfig option CONFIG_PLATFORM_EC_BOOT_AP_POWER_REQUIREMENTS enables checking power thresholds before booting the AP. See the file Kconfig.ap_power for all Kconfig options related to this feature.

Devicetree Nodes

None required.

Board Specific Code

None required.

Threads

AP_POWER support does not enable any threads.

Testing and Debugging

Use the battfake command to force the battery level, independent of the actual battery charge. To verify the AP power thresholds, force the battery level below the CONFIG_PLATFORM_EC_CHARGER_MIN_BAT_PCT_FOR_POWER_ON setting and reboot the EC. The EC should prevent the AP from powering up.

battfake usage: battfake (-1 = use real level)

battfake 2
reboot
/* Verify that AP does ot boot */
battfak3 3
/* Verify that AP boots */
/* Restore normal operation */
battfake -1

Example

For Herobrine, the minimum battery level to boot the AP without AC is 2 percent of the battery capacity and the minimum AC power to boot the AP with a battery is set to 10000 milliwats.

CONFIG_PLATFORM_EC_CHARGER_MIN_BAT_PCT_FOR_POWER_ON=2
CONFIG_PLATFORM_EC_CHARGER_MIN_POWER_MW_FOR_POWER_ON=10000