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Chapter 7 BIOS ROM
7.6.1 SMBIOS
In support of the DMI specification the PnP functions 50h and 51h are used to retrieve the
SMBIOS data. Function 50h retrieves the number of structures, size of the largest structure, and
SMBIOS version. Function 51h retrieves a specific structure. This system supports SMBIOS
version 2.3.1 and the following structure types:
Type
Data
0 BIOS Information
1 System Information
3 System Enclosure or Chassis
4 Processor Information
7 Cache Information
8 Port Connector Information
9 System Slots
13 BIOS Language Information
15 System Event Log Information
16 Physical Memory Array
17 Memory Devices
19 Memory Array Mapped Addresses
20 Memory Device Mapped Addresses
31 Boot Integrity Service Entry Point
32 System Boot Information
128 OEM Defined Structure with Intel Alert-On-LAN (AOL) Information
NOTE: System information on these systems is handled exclusively through the
SMBIOS. The System Information Table (SIT) method (and it’s associated BIOS
functions) used on previous systems is no longer supported.
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition - January 2003
7-16