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

0BIOS Information

1System Information

3System Enclosure or Chassis

4Processor Information

7Cache Information

8Port Connector Information

9System Slots

13BIOS Language Information

15System Event Log Information

16Physical Memory Array

17Memory Devices

19Memory Array Mapped Addresses

20Memory Device Mapped Addresses

31Boot Integrity Service Entry Point

32System Boot Information

128OEM 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.

7-16Compaq Evo and Workstation Personal Computers

Featuring the Intel Pentium 4 Processor

Second Edition - January 2003

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Compaq W4000 manual Smbios