What would occur when OSPM transition an ACPI/Legacy platform from the Legacy mode to the ACPI mode?
1. ACPI driver checks that the SCI_EN bit is zero, and that it is in the Legacy mode.
2. OSPM does an OUT to the SMI_CMD port with the data in the ACPI_ENABLE field of the FADT.
3. OSPM polls the SCI_EN bit until it is sampled as SET.
Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: What would occur when OSPM transition an ACPI/Legacy platform from the Legacy mode to the ACPI mode? ### Response: 1. ACPI driver checks that the SCI_EN bit is zero, and that it is in the Legacy mode.
2. OSPM does an OUT to the SMI_CMD port with the data in the ACPI_ENABLE field of the FADT.
3. OSPM polls the SCI_EN bit until it is sampled as SET. 