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System Support
4.4.2 Standard CMOS Locations
Table 4-6 describes standard configuration memory locations 0Ah-3Fh. These locations are
accessible through using OUT/IN assembly language instructions using port 70/71h or BIOS
function INT15, AX=E823h.
NOTES:
Assume unmarked gaps are reserved.
Higher locations (>3Fh) contain information that should be accessed using the INT15, AX=E845h
BIOS function (refer to Chapter 8 for BIOS function descriptions).
4.5 System Management
This section describes functions having to do with security, power management, temperature,
and overall status. These functions are handled by hardware and firmware (BIOS) and generally
configured through the Setup utility.
4.5.1 Security Functions
These systems include various features that provide different levels of security. Note that this
subsection describes only the hardware functionality (including that supported by Setup) and
does not describe security features that may be provided by the operating system and application
software.
Table 4-6.
Configuration Memory (CMOS) Map
Location Function Location Function
00-0Dh Real-time clock 24h System board ID
0Eh Diagnostic status 25h System architecture data
0Fh System reset code 26h Auxiliary peripheral configuration
10h Diskette drive type 27h Speed control external drive
11h Reserved 28h Expanded/base mem. size, IRQ12
12h Hard drive type 29h Miscellaneous configuration
13h Security functions 2Ah Hard drive timeout
14h Equipment installed 2Bh System inactivity timeout
15h Base memory size, low byte/KB 2Ch Monitor timeout, Num Lock Cntrl
16h Base memory size, high byte/KB 2Dh Additional flags
17h Extended memory, low byte/KB 2Eh-2Fh Checksum of locations 10h-2Dh
18h Extended memory, high byte/KB 30h-31h Total extended memory tested
19h Hard drive 1, primary controller 32h Century
1Ah Hard drive 2, primary controller 33h Miscellaneous flags set by BIOS
1Bh Hard drive 1, secondary controller 34h International language
1Ch Hard drive 2, secondary controller 35h APM status flags
1Dh Enhanced hard drive support 36h ECC POST test single bit
1Eh Reserved 37h-3Fh Power-on password
1Fh Power management functions 40-FFh Feature Control/Status
- Technical Reference Guide 1
- First Edition (October 2007) 2
- Contents 3
- 3 Processor/Memory Subsystem 4
- 4 System Support 4
- 5 Input/Output Interfaces 4
- 8SYSTEM BIOS 6
- A Error Messages and Codes 6
- Introduction 7
- 1.5 Notational Conventions 9
- Table 1-1 10
- Table 1-1 (Continued) 11
- System Overview 17
- 2.2 Features 18
- Table 2-1 19
- 2.3 System Architecture 20
- 2.3.1 Intel Processor Support 22
- 2.3.2 Chipset 23
- 2.3.3 Support Components 24
- 2.3.4 System Memory 24
- 2.3.5 Mass Storage 25
- 2.3.9 Graphics Subsystem 26
- 2.3.10 Audio Subsystem 26
- 2.4 Specifications 27
- Table 2-8 28
- Physical Specifications 28
- Table 2-9 29
- Table 2-10 30
- Optical Drive Specifications 30
- Table 2-11 31
- Hard Drive Specifications 31
- Processor/Memory Subsystem 33
- 3.2 Intel Processors 34
- 3.3 Memory Subsystem 36
- 3.3.1 Memory Upgrading 37
- System Support 39
- Software/Driver Layer 41
- Transaction Protocol Layer 41
- 4.2.3 Option ROM Mapping 42
- 4.2.4 PCI Interrupts 42
- 4.2.6 PCI Connectors 43
- PCI Express Connectors 44
- 4.3 System Resources 45
- 4.3.2 Direct Memory Access 46
- 4.4.1 Clearing CMOS 47
- 4.5 System Management 48
- Power-On / Setup Password 49
- Setup Password 49
- Cable Lock Provision 49
- I/O Interface Security 49
- Chassis Security 49
- 4.5.2 Power Management 50
- 4.5.3 System Status 51
- 4.6.1 System I/O Map 52
- 4.6.2 GPIO Functions 53
- I/O Controller Functions 54
- Input/Output Interfaces 55
- 5.2 SATA Interface 56
- 5.3 PATA Interface 57
- 5.4 Diskette Drive Interface 58
- Table 5-3 59
- 5.5 Serial Interface 60
- 5.6 Parallel Interface 61
- Table 5-5 62
- Table 5-6 64
- 5.8.1 USB Connector 65
- 5.8.2 USB Cable Data 66
- 5.9 Audio Subsystem 67
- 5.9.1 HD Audio Controller 68
- 5.9.2 HD Audio Link Bus 68
- 5.9.3 Audio Multistreaming 68
- 5.9.4 Audio Specifications 69
- 5.10.1 Wake-On-LAN Support 71
- 5.10.4 NIC Connector 72
- 5.10.5 NIC Specifications 72
- Integrated Graphics Subsystem 73
- 6.2 Functional Description 74
- Controller 74
- 6.3 Display Modes 76
- 6.4 Upgrading 77
- 6.5 Monitor Connectors 78
- Table 6-4 79
- Power and Signal Distribution 81
- 7.2.2 SFF Power Distribution 82
- Table 7-2 83
- 7.2.3 CMT Power Distribution 84
- 7.2.4 Energy Star Compliancy 85
- 7.3 Power Con trol 86
- Table 7-5 87
- Power Button Actions 87
- Power LED Condition 87
- 7.3.2 Wake Up Events 88
- 7.3.3 Power Management 89
- 7.4 Signal Distribution 90
- Table 7-7. (Continued) 91
- SYSTEM BIOS 93
- 8.2 ROM Flashing 94
- 8.3 Boot Functions 95
- 8.3.4 Boot Error Codes 96
- Table 8-2 97
- 8.4.1 System ID and ROM Type 98
- 8.4.2 Temperature Status 98
- 8.4.3 Drive Fault Prediction 98
- 8.5 SMBIOS 99
- 8.6 USB Legacy Support 100
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