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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 <percent> (-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
```
[AP]: ../ec_terms.md#ap
[Kconfig.ap_power]: https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/ec/zephyr/Kconfig.ap_power
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