Intel OCPRF100 MP - Manual (Page 78)

OCPRF100 MP Server System Technical Product Specification
Revision 1.0
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Ultra I/O chip also provides a keyboard controller containing Phoenix* microcode. BIOS down-
loads 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 operat-
ing 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.
6.1.4 Intelligent Platform Management Bus
BIOS communicates with the IPMB to update the SEL through the baseboard management con-
troller (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 proces-
sors 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.
6.2 Industry 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.
6.2.1 ACPI
The system BIOS supports the Advanced Configuration and Power Interface (ACPI) Specifica-
tion, 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.