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18 Intel
®
NetStructure™ MPCHC5525 System Master Processor Board IPMI Reference Driver User’s Guide
IBMU Functionality
1. The system management software residing on the CPU board in chassis 2 sends an ICMB
message to the BMC2. This ICMB message contains the ICMB header information and the
IPMI command “Master Write-Read I
2
C” with which the fan sensor data is requested.
2. The BMC2 sends the ICMB message to the BMC1 via ICMB.
3. BMC1 extracts the IPMI command “Master Write-Read I2C” from the ICMB message.
4. BMC1 reads the sensor temperature on the fan module via the command “Master Write-Read
I
2
C” and sensor registers.
5. BMC1 adds an ICMB header to the sensor result and sends the ICMB message via ICMB and
BMC2 to the system management software.
Figure 11. Example for Nonintelligent Device via ICMB