Mbmc Self Test; Messaging Interfaces; Channel Management; User Model - Intel SE7520JR2 Technical Manual

Platform Management
5.3.16

mBMC Self Test

The mBMC performs various tests as part of its initialization. If a failure is determined (e.g.,
corrupt mBMC FRU, SDR, or SEL), the mBMC stores the error internally.
5.3.17

Messaging Interfaces

This section describes the supported mBMC communication interfaces:
• Host SMS Interface via SMBus interface
• LAN interface using the LOM SMBus
These specifications are defined in the following subsections.
5.3.17.1

Channel Management

The mBMC supports two channels:
• System interface
• 802.3 LAN
Channel ID
1
2
5.3.17.2

User Model

The mBMC supports one anonymous user (null user name) with a settable password. The IPMI
Set User Password command is supported.
5.3.17.3

Request/Response Protocol

All of the protocols used in the above mentioned interfaces are Request/Response protocols. A
Request Message is issued to an intelligent device, to which the device responds with a
Response Message.
As an example, with respect to the IPMB interface, both Request Messages and Response
Messages are transmitted on the bus using SMBus Master Write transfers. In other words, a
Request Message is issued from an intelligent device acting as an SMBus master, and is
received by an intelligent device as an SMBus slave. The corresponding Response Message is
issued from the responding intelligent device as an SMBus master, and is received by the
request originator as an SMBus slave.
5.3.17.4

Host to mBMC Communication Interface

The host communicates with the mBMC via the System Management Bus (SMBus). The
interface consists of three signals:
• SMBus clock signal (SCLH)
134

Table 52: Suported Channel Assignments

Media Type
802.3 LAN IPMB 1.0
System Interface IPMI-SMBus
C78844-002
Intel® Server Board SE7520JR2
Interface Supports Sessions
Multi-sessions
Session-less
Revision 1.0