Alert Standard Format (ASF) Specification

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Alert Standard Format (ASF) Specification v2.0 DMTF Document DSP0136

DSP0136 23 April 2003 Page 60 of 94

4.3 SMBus Serial EEPROM (SEEPROM)

An implementation might choose to identify all or part of the managed client’s fixed SMBus

addresses and legacy access-methods using data structures present in an SMBus-attached

SEEPROM whose address is specified in the SEEPROM Address field of the

ASF_ADDR structure

(see 4.1.2.7). This method lends itself to a notebook/docking-station system implementation, with

the notebook firmware providing the fixed address of the docking station’s SEEPROM and that

SEEPROM providing the fixed addresses present on the docking station itself. Alternatively, the

notebook firmware would need to provide the fixed address and legacy-device information for all

its supported docking stations.

The SEEPROM referenced by the SEEPROM Address conforms to [FRU], and all ASF-related

data are stored in the MultiRecord area of the device.

4.3.1 Fixed SMBus Addresses (SEEPROM Record Type 06h)

A record header of the following format (as defined by [FRU]) identifies a Fixed SMBus

Addresses record:

Offset Format Description

00h BYTE Record Type ID. Set to 06h to identify a Fixed SMBus Addresses record.

01h BYTE

Bit(s)

Meaning

7 End of List

6:4 Reserved, set to 000b

3:0 Record Format version

02h BYTE

Record Length. Identifies the length of the Fixed SMBus Addresses record that

follows, not including this record header.

03h BYTE

Record Checksum. This value, when added to the byte-wise checksum of the record,

produces a result of 00h.

04h BYTE

Header Checksum. This value causes the byte-wise checksum of the record header

to result in 00h.

The Fixed SMBus Addresses record directly follows its record header in the SEEPROM and is

specified as an ASF_ADDR structure, starting at offset 01h (i.e. the structure’s data, not including

the SEEPROM Address field). Software agents that perform SMBus address assignment should

note that fixed-address devices listed in this record might also be discoverable via SMBus ARP

methods.

4.3.2 ASF Legacy-Device Alerts (SEEPROM Record Type 07h)

A record header of the following format (as defined by [FRU]) identifies an ASF Legacy-Device

Alerts record: