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4 BIOS CONFIGURATION AND OS SUPPORT
BIOS overview
The Q35 system BIOS uses the Phoenix TrustedCore BIOS with RadiSys extensions. BIOS
features include:
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Core multi-processing for Intel Core 2 Duo and Pentium Dual-Core processors
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ACPI 3.0 wake up from S3, S4, and S5
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CMOS saving and restoration via BIOS setup utility
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Pre-boot Execution Environment (PXE) boot
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Wake on LAN
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High-performance, power-saving Intel SpeedStep™ technology and CPU throttling
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High-resolution, GUI-based, customizable splash screen
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Intel Vanderpool virtualization technology
The system BIOS stores the system parameters such as types of disk drives and video displays,
in the CMOS RAM to initialize the system during boot. The CMOS memory requires very little
electrical power. When the system is powered off, a backup RTC battery provides power to the
CMOS logic, enabling it to retain system parameters. Each time the system is powered on, the
BIOS configures the system with the values stored in the CMOS RAM.
Using the BIOS setup utility, you can display and modify the system configurations.
POST and boot process
The system BIOS performs a Power On Self Test (POST) upon power-on or reset, which
attempts to determine whether further operation is possible:
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If a warning occurs, a message is displayed on the primary display device but the boot
process does not stop.
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If an error is detected, the boot process is halted.
Failures during POST can be indicated by POST checkpoint codes on the BIOS setup screen or
POST card that is installed on the motherboard I/O connector. For detailed information, see
POST checkpoint codes on page 63.
After POST completes, the system BIOS will search for boot devices in the order configured by
the BIOS setup utility and load an operating system from the first boot device found. Control is
then passed to the operating system and the system BIOS plays no further part in the boot
process except to provide run-time services.