Between BIOS and EC

When system enter POST phase, the BIOS should send EC command to notify EC now is in POST.
Before system enter Windows, the BIOS should send EC command to notify EC now is in ACPI mode.

EC is in ACPI mode:
For example
In Windows --> Unplug AC Adaptor --> Trigger EC SCI Pin --> Notify OS Acpi Driver --> Do Q Event (AC unplug ASL code)

EC is not in ACPI mode:
For example
In DOS --> Unplug AC Adaptor --> Trigger EC SMI Pin --> Enter SMM Mode --> Do SMI Handler (AC unplug SMI code)

 

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當系統在POST階段，BIOS需要送EC command告訴EC現在在POST階段。

在系統進入到Windows之前，BIOS需要送EC command告訴EC現在要進入ACPI mode, 去服務SCI。

EC在ACPI mode:
例如：
在Windows環境裡 --> 移除AC電源 --> 觸發EC SCI Pin --> 告訴OS Acpi 的驅動程式 --> 執行Q Event (AC unplug ASL code)

EC不在ACPI mode:
例如：
在DOS環境裡 --> --> 移除AC電源 --> 觸發EC SMI Pin --> 進入SMM Mode --> 執行SMI Handler (AC unplug SMI code)