OCPRF100 MP Server System Technical Product Specification

Revision 1.0

The system supports the S1, S4 OS, and S5 sleep states. It also supports Wake-on-LAN* from the S1 and S4 states.

After the operating system sends the command to switch to ACPI mode, the power button acts as a sleep button and a power button. If the button is pressed for less than four seconds, the system enters a sleep state determined by the operating system. If it is pressed for more than four seconds, the system powers down to the S5 state.

S1 Sleep State. The system enters the S1 sleep state when the power button is pressed momentarily or when the operating system directs it to enter S1. The S1 sleep state retains the system context; all processors’ caches, memory, and chip set devices retain their state informa- tion. Only the power button and power management events (Wake-on-LAN) can wake the system from S1.

S4 Sleep State. The system enters the S4 state when the power button is pressed (if configured for hibernation) or when the hibernate option is chosen in the shutdown menu. If the operating system supports save-to-disk, it stores the system context to hard disk before powering down. When the system powers on, the operating system restores all processes from the disk. When the system awakens, BIOS performs a normal boot; BIOS does not participate in saving and restoring the system context.

S5 Sleep State. The system powers down without saving context.

6.2.2Boot Devices and Peripherals

The system BIOS supports a wide range of peripherals and boot devices. The system can boot an operating system from a floppy, an IDE device, a SCSI device, a network card, or an I2O device. Bootable CD-ROMs are supported in emulation and nonemulation modes.

The system BIOS supports the following specifications:

•BIOS Boot Specification, Version 1.01.

•El Torito CD-ROM Boot Specification, Version 1.0.

•Intelligent I/O (I2O) Architecture Specification, Revision 1.0.

•Universal Serial Bus (USB) Specification, Revision 1.0.

Legacy USB devices are not supported by BIOS, but nothing in BIOS precludes support by an operating system. A USB-aware operating system can enable the USB functionality.

Ordinarily, the system BIOS boots from the first device detected in its scan order. If adapters conform to the BIOS Boot Specification, the boot device can be selected without changing the placement of the adapter cards.

I2O defines a standard architecture for intelligent I/O. This is an approach to I/O in which low- level interrupts are handled by specially designed I/O processors which communicate by passing messages. Although the OCPRF100 MP server system does not include any built-in I2O devices,

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