Chassis Plans ATXP-875P, Technical Reference

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Chapter 2: BIOS Configuration ATXP-875P – Technical Reference
24 Chassis Plans
Advanced ACPI Configuration
You can use this screen to select options for the ACPI Advanced Configuration Settings. Use the up and down
<Arrow> keys to select an item. Use the <Plus> and <Minus> keys to change the value of the selected option. A
description of the selected item appears on the right side of the screen.
ACPI 2.0
Set this value to allow or prevent the system to be complaint with the ACPI 2.0 specification.
No This setting prevents the BIOS from supporting the ACPI 2.0 specification. This is the default setting.
Yes This setting allows the BIOS to support the ACPI 2.0 specification.
ACPI APIC Support
Set this value to allow the ACPI BIOS to add support for the APIC.
Disabled .
Enabled This is the default setting.
APIC ACPI SCI IRQ
Disabled This is the default setting.
Enabled .
BIOS
Æ
AMI ACPI Table
Set this value to allow the ACPI BIOS to add a pointer to an OEMB table in the Root System Description Table
(RSDT) table.
Disabled This option disables adding an OEMB table.
Enabled This option enables adding an OEMB table. This is the default setting.
Note:
OEMB table is used to pass POST data to the AML code during ACPI O/S operations.
RSDT
RSDT is the main ACPI table. It has no fixed place in memory. During the boot up process, the BIOS locates a
pointer to the table during the memory scan. A Root System Descriptor Pointer (RSDP) is located in low memory
space of the system. It provides the physical address of the RSDT. The RSDT itself is identified in memory because
it starts with the signature "RSDT." Following the signature is an array of pointers that tell the operating system the
location of other description tables that provide it with the information it needs about the standards defined on the
current system and individual devices.
AML
ACPI Machine Language (AML) is a binary code format that the operating system's ACPI AML interpreter parses
to discover the machine's properties. On boot up the BIOS startup code copies it into system memory, where it can
be interpreted by the operating system’s ACPI AML interpreter.
Headless Mode
This option is used to update the ACPI FACP table to indicate headless operations.
Disabled This option disables updating the ACPI FACP table to indicate headless operation. This is the default
setting.
Enabled This option enables updating the ACPI FACP table to indicate headless operation.