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CP6940 User Guide
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4.4.2.2
OEM Sensors
OEM IPMB Link (Type C3h)
Table 19:
IPMB Link (Type C3h) Reading
Offset
Request data
1
Sensor Number
Response data
1
Completion Code
2
Sensor Reading
[7:4] – Reserved, ignore on read
[3] – IPMB-L Override State
0b = override state, bus isolated
1b = local control state, MMC determines state of the bus
[2:0] – IPMB-L Local State
0h = no failure, bus enabled
1h = unable to drive clock high
2h = unable to drive data high
3h = unable to drive clock low
4h = unable to drive data low
5h = clock low timeout
6h = under test (MMC is attempting to determine if it is causing a bus hang)
7h = undiagnosed communication failure
3
Standard IPMI Byte. (See “Get Sensor Reading in the IPMI Specification)
4
[7:2] – Reserved, read as zero
[1] – 1b = IPMB-L enabled
[0] – 1b = IPMB-L disabled
5
80h – Ignore on read
