OCPRF100 MP Server System Technical Product Specification

Revision 1.0

Ultra I/O chip also provides a keyboard controller containing Phoenix* microcode. BIOS downloads commands to the keyboard controller to provide various security features.

The I/O carrier contains 10 hot-plug PCI slots plus a PCI SVGA controller (Cirrus Logic* CL- GD5446) and a dual-channel low-voltage differential SCSI controller (Symbios* SYM53C896). The flash ROM contains the option ROM (OPROM) for both of these components.

BIOS uses the programmable interrupt device (PID) to route PCI interrupts to the AT-compatible PICs. The PID also contains an I/O APIC that can handle interrupts when enabled by the operating system (OS). BIOS provides the standard Plug and Play interfaces for PCI interrupt routing.

The system flash ROM contains 2 MB of field programmable memory. The upper 1 MB contains BIOS and other regions reserved for Intel. The lower 1 MB is available for use by system ven- dors. BIOS implements a security mechanism that reduces the risk of unauthorized modification of the system flash ROM.

6.1.4Intelligent Platform Management Bus

BIOS communicates with the IPMB to update the SEL through the baseboard management controller (BMC), display messages on the LCD, and implement FRB. By passing messages over the IPMB to the BMC, server management cards can access the log, even if the system processors are not running.

The server management interface controller (SMIC) provides the gateway to the IPMB. The BMC accesses many of the system components.

The BIOS provides interface functions that allow real-mode software to send messages over the IPMB.

6.2Industry Standards

The OCPRF100 MP server system BIOS supports industry standards wherever possible. These standards expand the range of operating systems, software, adapters, and peripheral devices supported by the system.

System vendors that develop software to differentiate their server products also benefit because standards provide a consistent programming interface, regardless of the underlying hardware.

The system BIOS is governed by the following industry standards.

6.2.1ACPI

The system BIOS supports the Advanced Configuration and Power Interface (ACPI) Specification , Revision 1.0. ACPI is the key element in operating system directed power management. It supports an orderly transition from existing (legacy) hardware to ACPI-compliant hardware. With ACPI, the operating system can take direct control over the power management and Plug and Play functions of the system. ACPI makes the MPS table and the Plug and Play BIOS run-time interfaces obsolete.

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