
CP6000 UG, ID 27942, Rev. 05
Kontron Modular Computers GmbH
Chapter 3: Advanced BIOS Setup
23
Advanced BIOS Setup,
Continued
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.
Option Description
Disabled
This option disables updating the ACPI FACP table to indicate headless operation.
Enabled
This option enables updating the ACPI FACP table to indicate headless operation.
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