Dell
Dell PowerEdge R910 Technical Guide 31
9 BIOS
9.1 Overview
The Dell™ PowerEdge™ R910 BIOS is based on the Dell BIOS core, and supports the following features:
Intel
®
Xeon
®
E7-4800 and E7-8800 product family, and Intel Xeon processor 7500 series
support
Simultaneous Multi-Threading (SMT) support
CPU Turbo Mode support
PCI 2.3 compliant
Plug and Play 1.0a compliant
MP (Multiprocessor) 1.4 compliant
Boot from hard drive, optical drive, iSCSI drive, USB key, and SD card
ACPI support
Direct Media Interface (DMI) support
PXE and WOL support for on-board NICs
Memory mirroring and spare bank support
SETUP access through <F2> key at end of POST
USB 2.0 (USB boot code is 1.1 compliant)
F1/F2 error logging in CMOS
Virtual KVM, CD, and floppy support
Unified Server Configurator (UEFI 2.1) support
Power management support including DBS, Power Inventory and multiple Power Profiles
9.2 I2C
I2C is a simple bi-directional 2-wire bus for efficient inter-integrated circuit control. All I2C-bus
compatible devices incorporate an on-chip interface which allows them to communicate directly with
each other via the I2C-bus. These I2C devices perform communication functions between intelligent
control devices (e.g., microcontrollers), general-purpose circuits (e.g., LCD drivers, remote I/O
ports, memories) and application-oriented circuits.
The PE R910, BIOS accesses the I2C through the ICH10 (Intel I/O Controller Hub 10). There are two
MUX’s on ICH10’s I2C bus.
One MUX (U_ICH_SPD) controls the DIMM SPDs through four split segments
The other MUX (U_ICH_MAIN) controls the clock buffers, TOE, USB Hub through four split
segments.
BIOS controls both the MUX’s through the two select lines using GPIO pins.
The Clock chip, USB hub, and the front panel EEPROM device addresses are located on the IOH I2C
bus.
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